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Studies of Adsorption of Cadmium Ions by Biowaste Adsorbent from Aqueous Solutions with Ion-Selective Electrodes and ICP-OES
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作者 Taha Fadlou Allah Kaltrina Jusuf +3 位作者 Ali A. Shohatee Liang Feng Louis Trombetta Enju Wang 《American Journal of Analytical Chemistry》 2023年第6期274-286,共13页
Using environment-friendly and low-cost biowaste adsorbents as toxic metal ion removal substrates from aqueous solutions has a great economic advantage. This work evaluated pumpkin and potato peel biowastes for the ad... Using environment-friendly and low-cost biowaste adsorbents as toxic metal ion removal substrates from aqueous solutions has a great economic advantage. This work evaluated pumpkin and potato peel biowastes for the adsorption of cadmium ions. The biowastes were treated with acid or base. Batch experiments were carried out by introducing a known concentration of metal ion solution into the biowaste sorbent at various pH levels. The pH and metal ion concentration was monitored with pH and cadmium ion-selective electrode continuously for two hours, and the final concentration for the metal ion after 24 hours was measured with the cadmium electrode and then confirmed with ICP-OES. L-type isotherms were obtained that fit to Freundlich model. Adsorption isotherms showed chemical adsorption and the kinetics following the second order model. Equilibrium adsorption capacity is higher than 29 mg/g at pH 5.6 when the initial concentration is 220 ppm. Dynamic cadmium adsorption capacity is 17 mg/g from aqueous solution when the feed solution is 220 ppm with pumpkin peel biowaste sorbent. The biowaste materials can be regenerated with acid washing. 展开更多
关键词 Cadmium Ion Biowaste Sorbent ion-selective electrode ICP-OES
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Direct Determination of Potassium-Sodium Activity Ratio in Soil Suspension with Two Ion-Selective Electrodes 被引量:1
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作者 LIHONG-YAN JIGUO-LIANG 《Pedosphere》 SCIE CAS CSCD 1991年第4期363-369,共7页
A K+-selective electrode and a Na+-selective electrode were used to construct a measuring cell without liquid-junction for the determination of the ion activity ratio of K+ to Na+ in soil suspensions. The measured cel... A K+-selective electrode and a Na+-selective electrode were used to construct a measuring cell without liquid-junction for the determination of the ion activity ratio of K+ to Na+ in soil suspensions. The measured cell potential was not affected by the total electrolyte concentration when the total cation concentration was 10-1-10-3 mol L-1 and the concentration ratio CK+ / CNa+. was 10:1 to 1:50. When the concentration ratios were equal to 1and the total electrolyte concentrations were 10-2 and 10-3 mol L-1, the ion activity ratio measurement would not be affected by pH in the pH range of 3.5 to 11.5 and 4.4 to 11 respectively. Ions other than H+ have no remarkable influence on the measurement. The ion activity ratio of K+ to Na+ measured directly in soil suspension agree well with those in centrifuged supernant solution. The relative deviation was within 4%. From the measured ion activity ratio, the difference of the bonding energies of K+ and Na+ ions was calculated. 展开更多
关键词 ion activity ratio ion-selective electrode potassium ion sodium ion
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Preparation of CeO_2 Nanoparticles and Its Application to Ion-selective Electrodes Based on Acetyl Cellulose 被引量:1
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作者 Jinzhang Gao Fei Guan +4 位作者 Yongjun Ma Wu Yang Jingwan Kang Hualing Deng Youli Qi 《Rare Metals》 SCIE EI CAS CSCD 2001年第4期217-221,共4页
CeO2 nanoparticles with an average diameter of about 30 nm were prepared by sol-gel method at lower temperature. The gel, transformed from the aqueous solution of metal nitrate and citric acid, can be combusted comple... CeO2 nanoparticles with an average diameter of about 30 nm were prepared by sol-gel method at lower temperature. The gel, transformed from the aqueous solution of metal nitrate and citric acid, can be combusted completely at lower temperature. The redox behavior and the crystallization process of the dried gel were studied by thermogravimetric analysis and infrared spectroscopy. The synthesized powders were characterized by X-ray powder diffraction and transmission electron microscopy. In addition, rare earth elements ion-selective electrodes based on acetyl cellulose were prepared using ultra fine cerium oxide powders. 展开更多
关键词 CeO2 nanoparticles sol-gel method ion-selective electrode acetyl cellulose
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Construction and Application of a PVC Membrane Enoxacin Ion-selective Electrode Based on a Needle-shaped Inner Reference Electrode
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作者 HUANG Chao-lun LI Rui-fen XIU Rong 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2003年第4期409-412,共4页
A PVC membrane enoxacin ion-selective electrode based on a needle-shaped inner reference electrode was prepared. A Ag/AgCl wire was used as the substrate of this electrode. It was previously coated with a thin sheet o... A PVC membrane enoxacin ion-selective electrode based on a needle-shaped inner reference electrode was prepared. A Ag/AgCl wire was used as the substrate of this electrode. It was previously coated with a thin sheet of urea-formaldehyde resin containing Cl - ions to form a needle-shaped inner reference electrode, then the inner reference electrode was coated with a thin sheet of a PVC membrane containing an enoxacin tetraphenylborate ion-pair complex. The influences of various ion-pair complexes, concentrations of the active components in the membrane and the plasticizers on the performance of the electrode were studied by orthogonal design. The linear response range of the electrode was 7.9×10 -5 -1.0×10 -2 mol/L. The detection limit was 2.0×10 -5 mol/L. The slope was 30.4 mV/decade(25 ℃). The electrode can be used for the potentiometric determination of enoxacin tablets directly. The average recovery was 100.4%, and the RSD was 0.9%. The results agreed with those determined by the method in Chinese Pharmacopoeia. 展开更多
关键词 Enoxacin PVC membrane-coated-wire electrode ion-selective electrode Content determination
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Potentiometric Urea Biosensor Based on Ion-Selective Electrode by Different Immobilization Procedures
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作者 Nien-Hsuan Chou Jung-Chuan Chou +1 位作者 Tai-Ping Sun Shen-Kan Hsiung 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期309-312,共4页
Enzyme was immobilized on an ammonium ion-selective electrode by different methods.An ion-selective electrode is not completely ion-specific,and interfering ions react with the ion-selective electrode membrane,alterin... Enzyme was immobilized on an ammonium ion-selective electrode by different methods.An ion-selective electrode is not completely ion-specific,and interfering ions react with the ion-selective electrode membrane,altering the measured potential.Therefore,the characteristics of the effect of other ions on ammonium ion-selective electrode-based urea biosensors are considered.Based on the experimental results,the urea biosensor based on entrapment had a high response voltage of around 189 mV and fast response time of around 16 sec.Moreover,selectivity of the urea biosensor in different interfering ions was considered to elucidate the characteristics of ammonium ion-selective electrode-based biosensors. 展开更多
关键词 enzyme immobilization ammonium ion-selective electrode interfering ions urea biosensors SELECTIVITY
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STUDY OF CALCIUM ION-SELECTIVE ELECTRODE BASED ON A NEW NEUTRAL CARRIER
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作者 Wei XU Bin GUO You Rong NIE Zai Fu HUANG Department of Environmental Science,Wuhan University,430072 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第2期179-180,共2页
A calcium ion-setective eletrode based on a new neutral carrier was studied.The electrode gives a Nernstian response in the rang 5.9-1 Pa and the response is stable in a wide pH range.Logarithms of setectivity coeffic... A calcium ion-setective eletrode based on a new neutral carrier was studied.The electrode gives a Nernstian response in the rang 5.9-1 Pa and the response is stable in a wide pH range.Logarithms of setectivity coefficents are -2.3 Li(+),-3.5 Na(+),-4.0 K(+),-3.7NH_4(+),-4.5 Mg(2+) and -4.4Zn(2+). 展开更多
关键词 ETH ION STUDY OF CALCIUM ion-selective electrode BASED ON A NEW NEUTRAL CARRIER PVC
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Ion Selective Electrode Array Analysis Using Variable Step-Size Generalized Simulated Annealing
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作者 WANG Shi-hua, XIAO Dan and YU Ru-qin (Department of Chemistry and Chemical Engineering,Hunan Univ. ,Changsha,410082) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1993年第4期296-302,共7页
A global optimum location algorithm called Variable Step-Size Generalized Simulated Annealing(VSGSA) was applied to treating the data obtained by using an array of ion-electrodes in solutions containing mixtures of Na... A global optimum location algorithm called Variable Step-Size Generalized Simulated Annealing(VSGSA) was applied to treating the data obtained by using an array of ion-electrodes in solutions containing mixtures of Na+, K+, Ca2+. Unlike traditional optimization algorithms such as simplex procedure, VSGSA can be used to determine the model parameters without any priori information about the analytical system under investigation and overcome the disadvantage of simplex method which might converge to local extrema depending on the starting positions. The algorithm was applied to po-tentiometric determination of ions in mixture solutions. 展开更多
关键词 CHEMOMETRICS Multivariate calibration Array of ion-selective electrodes Generalized simulated annealing
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Binding mechanism of halide ions to bovine serum albumin and hemoglobin: investigated by ion selective-electrode
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作者 Gongke Wang Wen Tang +2 位作者 Xiaoxiao Hao Changling Yan Yan Lu 《Journal of Biophysical Chemistry》 2011年第3期194-201,共8页
The binding mechanism of the interactions of halide ions (F–, Br– and I–) with bovine serum albumin (BSA) and hemoglobin (Hb) were studied at different temperatures, by using ion-selective electrodes. The experimen... The binding mechanism of the interactions of halide ions (F–, Br– and I–) with bovine serum albumin (BSA) and hemoglobin (Hb) were studied at different temperatures, by using ion-selective electrodes. The experimental data were treated according to Klotz equation, and the number of binding sites and the binding constants were determined. The results show that the binding sites of F– on protein molecules are more than those of Br– and I–. Additionally, the number of the binding sites for halide ions on protein molecules increases with increasing temperature. This study also indicates that the binding constants for the interactions of halide ions with proteins gradually decrease as the size of halide ions and temperature increases. These behaviors were reasonably interpreted with the structural and thermodynamic factors. The thermodynamic functions at different temperatures were calculated with thermodynamic equations, and the enthalpy change for the interactions were also determined by isothermal titration calorimetry (ITC) at 298.15 K, which indicate that the interactions of halide ions with proteins are mainly electrostatic interaction. 展开更多
关键词 Binding Mechanism Interaction ion-selective electrode BOVINE Serum ALBUMIN HEMOGLOBIN
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罗氏ISE Module定标结果各项数值计算方法及意义
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作者 秦晓燕 王朝鑫 杨秋菊 《中国医疗设备》 2010年第10期83-84,共2页
离子选择电极具有对溶液中特定离子选择响应的能力。根据电极电位法的原理应用能斯特(Nernst)方程式,介绍罗氏ISE Module(电解质模块)定标结果的计算方法,及各数值的意义。
关键词 离子选择电极 电极电位 电解质模块 电解质测定
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电位法测定锆─—氟电极和AppleII-ISE智能离子计的应用
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作者 孙炳耀 韩虹 +1 位作者 叶英植 夏磊 《郑州大学学报(自然科学版)》 1995年第4期68-71,共4页
本文报道一种基于非线性回归和抛物插值、利用氟电极和AppleII-ISE智能离子计测定锆的新方法,并且讨论了适宜的测定条件。
关键词 氟电极 智能离子计 非线性回归 电位法
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A comparative study of four 20-membered N_2S_4-crown ethers as ionophores for polymeric membrane silver selective electrodes 被引量:4
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作者 Zhang, Jun Yu, Shun Yang +2 位作者 Yin, Tan Ji Hu, Xue Feng Qin, Wei 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第4期464-467,共4页
Four 20-membered N_2S_4-monoazathiacrown ethers have been synthesized and explored as neutral ionophores for Ag^+-selective electrodes.Potentiometric responses reveal that the flexibility of the ligands has great effe... Four 20-membered N_2S_4-monoazathiacrown ethers have been synthesized and explored as neutral ionophores for Ag^+-selective electrodes.Potentiometric responses reveal that the flexibility of the ligands has great effect on the selectivity and sensitivity to Ag^+ ions.The electrode based on ionophore 9,10,20,25-tetrahydro-5H,12H-tribenzo[b,n,r][1,7,10,16,4,13]tetrathiadiaza cycloicosine 6,13-(7H,14H)-dione(C) with 2-nitrophenyl octyl ether(o-NPOE) as solvent in a poly(vinyl chloride)(PVC) membrane matrix sho... 展开更多
关键词 ion-selective electrodes SILVER IONOPHORE Azathiacrown ether
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溶液pH对基于金属钼的磷酸根ISE测量性能的影响
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作者 刘亚楠 杨慧中 《传感器与微系统》 CSCD 北大核心 2021年第8期42-45,49,共5页
金属钼离子选择电极(ISE)在检测磷酸根离子(HPO_(4)^(2-))过程中响应电位容易受到被测溶液pH值的影响,进而影响ISE的测量性能。采用电化学阻抗谱法研究了电极/溶液界面上的电化学过程及被测溶液pH值变化对电极过程动力学参数的影响。利... 金属钼离子选择电极(ISE)在检测磷酸根离子(HPO_(4)^(2-))过程中响应电位容易受到被测溶液pH值的影响,进而影响ISE的测量性能。采用电化学阻抗谱法研究了电极/溶液界面上的电化学过程及被测溶液pH值变化对电极过程动力学参数的影响。利用R(QR)或R(Q(RZ_(w)))等效电路拟合电极/溶液界面的双电层结构,可以发现,当被测溶液pH=11时,钼电极的电荷转移电阻R_(ct)达到最低,此时电极表面反应程度最高,有利于提高钼电极对磷酸根离子的检测性能。通过检测一系列已知浓度的Na_(2)HPO_(4)溶液响应电位,评估了钼电极的检测性能,结果表明:在pH值为11的10^(-6)~10^(-1)mol/L的Na_(2)HPO_(4)标准溶液中,钼电极的检测斜率可达到-28.29 mV/(°),接近能斯特响应斜率,具有较好的检测性能。 展开更多
关键词 离子选择电极 钼电极 电化学阻抗谱 磷酸根
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Study on the Multi-Sensing System Based on the Tin Oxide pH Electrode
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作者 Gin-Chou Yang Jung-Chuan Chou +1 位作者 Tai-Ping Sun Shen-Kan Hsiung 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期221-224,共4页
In this study,the multi-sensing system based on the tin oxide pH electrode for the ion-determination was presented. With the advantages of the real-time supervisory control apparatus,the measured values could be displ... In this study,the multi-sensing system based on the tin oxide pH electrode for the ion-determination was presented. With the advantages of the real-time supervisory control apparatus,the measured values could be displayed on the liquid crystal display (LCD) immediately.In this study,the basic sensor was the tin oxide pH electrode,which was fabricated by radio frequency (r.f.) sputtering system on the indium tin oxide (ITO)/glass substrate.Moreover,the major blocks of the system consist of the tin oxide electrode-based ion selective electrodes (ISEs),an analog front-ended readout circuit,a microcontroller with built-in analog to digital (A/D) converter.In addition,by the embedded system design,the measurement results can be transmitted to a portable system or computer through the Universal Serial Bus (USB) and Universal Asynchronous Receiver Transmitter (UART) interface immediately.According to the experimental results,the multi-sensing system has high performance and reliability for pH,K^+,and Na^+ detection. 展开更多
关键词 multi-sensing system tin oxide pH electrode liquid crystal display(LCD) tin oxide electrode-based ion selective electrodes(ises) universal serial bus(USB) universal asynchronous receiver transmitter(UART)
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Iron-Selective Electrode Based on Phosphorylated Calix-6-Arene Derivative
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作者 Mohsen M. Zareh Wael Zordek Ahmed Abd-Alhady 《Journal of Sensor Technology》 2014年第4期186-194,共9页
The construction and performance characteristics of a novel Iron(III) membrane sensor based on (37-bis-[(diethoxy-thiophosphoryl)-oxy]-5,11,17,23,29,35-hexa-kis-(1,1-dimethylethyl)-calix[6]-arene-38,39,40,41,42-pentol... The construction and performance characteristics of a novel Iron(III) membrane sensor based on (37-bis-[(diethoxy-thiophosphoryl)-oxy]-5,11,17,23,29,35-hexa-kis-(1,1-dimethylethyl)-calix[6]-arene-38,39,40,41,42-pentol) (A) were reported in this paper. The sensor was prepared by incorporating compound (A) into a plasticized polyvinyl chloride PVC membrane. The electrode reveals a Nernstian behavior over a wide iron ion concentration range (1.0 × 10-2 - 1.0 × 10-4 mol·L-1), and relatively low detection limit (1.0 × 10-5 mol·L-1). The potentiometric response was independent on the pH of the solution in the range of 4 - 7. The electrode showed a very short response time (<5 s). It exhibited very good selectivity relative to a wide variety of metal cations. Correlation of selectivity coefficient values with ionic radii of interferent cations was discussed. The proposed iron- ISE was applied for analysis of iron containing samples with comparison to a recommended spectrophotometric method. 展开更多
关键词 Ferric ION Determination ION Selective electrode (ise) PVC-Membrane
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Development of Chloride Electrode Coated Wire and Composite Systems for Determination Chloride Ion in Gunungkidul Spring Water
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作者 Suyanta Sunarto Susila Kristianingrum Tanti Hidayah 《Journal of Chemistry and Chemical Engineering》 2014年第7期662-667,共6页
The purpose of this research was to fmd out effectiveness of chloride solid membrane electrode of coated wire system compared to solid membrane electrode of composite system, the Nernstian response and character's po... The purpose of this research was to fmd out effectiveness of chloride solid membrane electrode of coated wire system compared to solid membrane electrode of composite system, the Nernstian response and character's potential response (detection limit, selectivity and response time). The chloride ISEs (ion selective electrodes) in this research were the solid membrane chloride ISEs based AgC1. There were two types of chloride ISEs that were developed, namely the chloride ISEs of coated wire and composite systems. Both types of electrodes were characterized. The selectivity was done by comparing Esel of the chloride standard solutions and Esel of the interference ions (Br- and I-). The measurement of chloride ions in water samples was done by using the coated wire chloride ISE, the composite chloride ISE and the Mohr method. We compared the result of the two chloride ISE methods to that of standard method for chloride determination (Mohr) by using F-test and Post Hoc Test LSD (least significant difference) and Duncan. Analysis by using F-test and Post Hoc Test (LSD and Duncan) and characterization results of both the methods showed that coated wire chloride ISE was more effective compared to composite chloride ISE. Nemstian response was 59.83 mV/decade, linier range measurement was 10-1-10-5 M, limit detection was 1.23 × 10-5 M, response time along was 25 s and interfering ion was 10-4 M Br-. 展开更多
关键词 Chloride ises coated wire electrode composite electrode Gunungkidul spring water.
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Design of Fe (Ⅲ) and Hg (Ⅱ) Ion Selective Electrodes
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作者 Tuncer Mutlu 《Journal of Chemistry and Chemical Engineering》 2011年第5期451-455,共5页
Principally the basis of ISE is selecting of a support solid matrix and a nonsoluble compound or complexes of insighted cation, mixed with this solid. For preparing the ISE membranes there are some materials such PVC,... Principally the basis of ISE is selecting of a support solid matrix and a nonsoluble compound or complexes of insighted cation, mixed with this solid. For preparing the ISE membranes there are some materials such PVC, PE, organic polyelectrolytes, conducting polymers and inorganic compounds. The black white microscope photos are included, too. Detailed schemes and pictures of the electrodes and correlations were shown in the following article. Results are seen compatible for construction of the versatile ISE electrodes. 展开更多
关键词 ise electrode SCE ADHESIVE polymer MW pH and mV calibrations.
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Coulometric Response of H-Selective Solid-Contact Ion-Selective Electrodes and Its Application in Flexible Sensors+
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作者 Tingting Han Tao Song +4 位作者 Shiyu Gan Dongxue Han Johan Bobacka Li Niu Ari lvaska 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2023年第2期207-213,共7页
The analytical performance of H+-selective solid-contact ion-selective electrodes(SCISEs)based on solid contact polyaniline doped with chloride(PANI(Cl))and poly(3,4-ethylenedioxythiophene)doped with poly(styrene sulf... The analytical performance of H+-selective solid-contact ion-selective electrodes(SCISEs)based on solid contact polyaniline doped with chloride(PANI(Cl))and poly(3,4-ethylenedioxythiophene)doped with poly(styrene sulfonate)(PEDOT(PSS))was characterized by a developed coulometric signal transduction method.PEDOT(PSS)solid contact is covered by PVC based H+-selective membrane.The obtained coulometric signal demonstrates that the cumulated charge can be amplified by increasing the capacitance of solid contact.SCISEs covered with spin-coated membrane behave faster amperometric response than electrodes with drop-cast mem-brane.In contrast to earlier works,the amperometric response and impedance spectrum demonstrates H+transfer through SCISEs is independent from the thickness of membrane.The exceptional behavior of PANI(Cl)H+-SCISEs shows that the capacitance estimated from impedance spectrum at low frequency 10 mHz and coulometric signal of PANI(Cl)based SCISEs is influenced by the applied po-tentials,whereas PEDOT(PSS)solid contact is independent from the chosen applied potentials.Furthermore,preliminary investiga-tions of coulometric signal transduction on flexible pH sensor implies its potential applications in wearable sensors for sweat ion concentration detection. 展开更多
关键词 Solid-contact ion-selective electrodes Membranes Proton transfer Conducting materials Cyclic voltammetry Coulometric response Flexible sensors Electrochemical impedance spectrum
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Synthesis of a Tweezer-like Bis(phenylthiapropoxy)calix[4]-arene as a Cation/π Enhanced Sensor for Ion-Selective Electrodes
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作者 孙浩 曾宪顺 +7 位作者 吕监泉 冷雪冰 陈企发 徐风波 李庆山 何锡文 张文勤 张正之 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2002年第10期1109-1114,共6页
Two novel 25,27-dihydroxy-26,28-bis(3-phenylthiapropoxy)-calixarene (3) and 25,27-dihydroxy-26,28-bis(3-phenylthia-propoxy)-5,11,17,23-tetra-tert-butylcalixarene (4) were synthesized for the evaluation of their ion-... Two novel 25,27-dihydroxy-26,28-bis(3-phenylthiapropoxy)-calixarene (3) and 25,27-dihydroxy-26,28-bis(3-phenylthia-propoxy)-5,11,17,23-tetra-tert-butylcalixarene (4) were synthesized for the evaluation of their ion-selectivity in ion-selective electrodes (ISEs). ISEs based on 3 and 4 as neutral ionophores were prepared, and their selectivity coefficients for Ag + (lg K pot Ag,M) were investigated against other alkali metal, alkaline-earth metal, aluminum, thallium (I), lead and some transition metal ions using the separate solution method (SSM). These ISEs showed excellent Ag + selectivity over most of the interfering cations examined, except for Hg 2+ and Fe 2+ having relative smaller interference (lg K pot Ag,M≤-2.1). 展开更多
关键词 CALIXARENES synthesis silver selectivity ion-selective electrode
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Comparison of three measurement models of soil nitrate-nitrogen based on ion-selective electrodes
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作者 Shangfeng Du Qi Pan +1 位作者 Yun Xu Shushu Cao 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2020年第1期211-216,共6页
Ion-selective electrode(ISE)is a quick and low-cost method of soil nitrate nitrogen(N)detection.The measurement models of soil nitrate-N based on ISEs includes the linear regression model,multiple linear regression mo... Ion-selective electrode(ISE)is a quick and low-cost method of soil nitrate nitrogen(N)detection.The measurement models of soil nitrate-N based on ISEs includes the linear regression model,multiple linear regression model and BP neural network model,and so on.Three models were analyzed in theory,measurement experiments of validation samples and soil nitrate-N concentrations were carried out in this study,and the measurement accuracies of the three models were compared.The results showed that,in the measurement experiments of validation samples and soil nitrate-N concentrations,BP neural network model had the highest accuracy(the average relative errors between results of the BP neural network model and the reference values were 5.07%and 8.81%,respectively)among the three models,multiple linear regression model had the second highest accuracy(the average relative errors between results of the multiple linear regression model and the reference values were 7.70%and 10.51%,respectively),linear regression model couldn’t exclude the interference of chloride ions so that it had the lowest accuracy(the average relative errors between results of the linear regression model and the reference values were 11.16%and 12.28%,respectively)among the three models.The BP neural network model can effectively restrain the interference of chloride ions,and it has a high accuracy for the measurement of soil nitrate-N concentration,so that the BP neural network model can be used to measure soil nitrate-N concentration accurately. 展开更多
关键词 ion-selective electrode soil nitrate-nitrogen measurement model ACCURACY
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Kinetic Characteristics of Nitrate Uptake by Wheat and Rape and Their Determination 被引量:2
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作者 ZHANGLI-GAN XUANJIA-XIANG 《Pedosphere》 SCIE CAS CSCD 1993年第2期127-132,共6页
15-day old seedlings of wheat and rape were grown in a series of solutions with different concentrations of KNO3 for a definite period of time. The changes in NO3- concentration of the solutions were determined by the... 15-day old seedlings of wheat and rape were grown in a series of solutions with different concentrations of KNO3 for a definite period of time. The changes in NO3- concentration of the solutions were determined by the double ion-selective electrode method, and then the amount of NO3- taken up by the plants was estimated and values of Km and Imax of the Michealis-Menten equation were calculated. Results show that both the method and conditions of determination affected the values of Km and Imax. For example, the Km value was appreciably reduced when the volume of culture solution was increased or when the duration of nutrient uptake was shortened; the Km value obtained with short-term depletion method was higher than that obtained with long-term one. Similar Variations were found for the values of Imax. There was a considerable difference in the characteristics of uptake kinetics between wheat and rape when determined under the same conditions of determination. The isotherm of NO3- uptake by wheat could be separated into saturated and unsaturated parts, and when the concentration of NO3- exceeded 180 uuuuuuuuuuuuM, the relationship between the rate of NO3- uptake and NO3- concentration tended to be linear. However, the isotherm of NO3- uptake by rape was found to fit the Michealis-Menten equation and no linear relationship could be found. 展开更多
关键词 double ion-selective electrode method kinetic parameter NITRATE
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