期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
A Method of Determining Selectivity Coefficients Based on the Practical Slope of Ion Selective Electrodes 被引量:1
1
作者 Hai Xia WANG Min PU 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第4期355-358,共4页
It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity. This paper studied the new method of determining selectivity coefficients. A mix... It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity. This paper studied the new method of determining selectivity coefficients. A mixed ion response equation, which was similar to Nicolsky-Eisenman (N-E) equation recommended by IUPAC, was proposed. The equation includes the practical response slope of ISEs to the primary ion and the interfering ion. The selectivity coefficient was defined by the equation instead of the N-E equation. The experimental part of the method is similar to that based on the N-E equation. The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the Nernst response or non-Nernst response. The feasibility of the new method is illustrated experimentally. 展开更多
关键词 ion selective electrodes potentiometric selectivity coefficients Nicolsky-Eisenman equation.
下载PDF
Determination of Boron Trifluoride in Boron Trifluoride Complex by Fluoride Ion Selective Electrode 被引量:1
2
作者 郎五可 张卫江 +2 位作者 唐银 徐姣 张雷 《Transactions of Tianjin University》 EI CAS 2016年第1期83-88,共6页
A method was proposed to determine boron trifluoride in boron trifluoride complex using fluoride ion selective electrode(ISE). Hydroxide was chosen to mask aluminum for the determination of 0.01—0.1 mol/L of fluoride... A method was proposed to determine boron trifluoride in boron trifluoride complex using fluoride ion selective electrode(ISE). Hydroxide was chosen to mask aluminum for the determination of 0.01—0.1 mol/L of fluoride. The simulation indicated that the permissible aluminum masked at a certain p H value was limited and hardly related to F-concentration and boric acid. It is better to control p H value below 11.5 and the aluminum concentration within 0.025 mol/L to minimize the interference of hydroxide to the fluoride ISE. The decomposition conditions of boron trifluoride by aluminum chloride were investigated. It is found that the F-detection ratio will approach 1.0 if the Al/F molar ratio is 0.3—0.7 and aluminum concentration is no more than 0.02 mol/L when heated at 80 ℃ for 10 min. In one word, hydroxide is quite fit to mask aluminum for samples which contain high content of fluoride and aluminum and the BF3 content can be successfully determined by this method. 展开更多
关键词 boron trifluoride complex fluoride ion selective electrode sodium hydroxide aluminum chloride
下载PDF
A New Type of Dibenzoyl Tartaric Acid Selective Electrode Based on Polymer Membrane Containing Calixarene Ionophore 被引量:1
3
作者 Meng L ing\|zhi, Mei Gong\|xiong, He Yong\|bing, Li Jiang\|feng (College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, China) 《Wuhan University Journal of Natural Sciences》 CAS 2003年第01A期113-116,共4页
A new type of di benzoyl tartaric acid selective electr ode has been developed. Three double\| arm calixarene derivatives were emp loyed as the neutral ionophores. The poly(vinyl chloride) me... A new type of di benzoyl tartaric acid selective electr ode has been developed. Three double\| arm calixarene derivatives were emp loyed as the neutral ionophores. The poly(vinyl chloride) membrane electrode containing an amide derivative of ca lixarene as the neutral carrier an d a dibutyl phthalate as the plastici zer exhibited the highest sensitivity for dibenzoyl tartaric acid. The slop e of linear portion was 27.8 mV per c oncertration decade. The electrode has a fast response and a long lifetime . 展开更多
关键词 ion\|selective electrode calixarene ionophore mole cular recognition dibenzoyl tartaric acid
下载PDF
Effect of Preparation Process of Functional Polymer Active Materials on Properties of Gadolinium Ion Selective Electrode
4
作者 车吉泰 闫美兰 +1 位作者 林安 张万喜 《Journal of Rare Earths》 SCIE EI CAS CSCD 1991年第3期226-227,共2页
Recently we have studied the rare earth ion-selective electrodes with active materials of the func-tional polymers and found that the process chosen for the functional polymers had an effect on the propertiesof gadoli... Recently we have studied the rare earth ion-selective electrodes with active materials of the func-tional polymers and found that the process chosen for the functional polymers had an effect on the propertiesof gadolinium ion selective electrode besides the effects of their structures.1.Effect of preparation process of the grafted polymers on the properties ofgadolinium ion selective electrodesThe electrode membranes which consist of functional polymers as active materials were prepared by re-action of gadolinium chloride with the radiation grafted clmer of acrlic acid and polystyrene of which 展开更多
关键词 Functional polymer active materials Gadolinium ion selective electrode Grafted polymers
下载PDF
EFFECT OF STRUCTURE OF FUNCTIONAL POLYMER ACTIVE MATERIALS ON PROPERTIES OF GADOLINIUM ION SELECTIVE ELECTRODE
5
作者 车吉泰 闫美兰 张万喜 《Journal of Rare Earths》 SCIE EI CAS CSCD 1990年第3期189-193,共5页
In this paper,the functional polymeric active materials were prepared by the grafting copolymerization and their structure and properties were studied.The results show that the structure and properties of these ac- ti... In this paper,the functional polymeric active materials were prepared by the grafting copolymerization and their structure and properties were studied.The results show that the structure and properties of these ac- tive materials have the relative large effects on the properties of gadolinium ion selective electrodes. 展开更多
关键词 HDPE EFFECT OF STRUCTURE OF FUNCTionAL POLYMER ACTIVE MATERIALS ON PROPERTIES OF GADOLINIUM ion selective ELECTRODE
下载PDF
DETERMINATION OF SERUM ALBUMIN USING A SILVER ION SELECTIVE ELECTRODE
6
作者 Feng Lian LU (Department of Chemistry, Zhengzhou University, Zhengzhou, 450052) 《Chinese Chemical Letters》 SCIE CAS CSCD 1994年第10期879-880,共2页
In this paper is reported a new method of determining serum albumin with potentiometry. The silver ion selective electrode was used as working electrode and S. C. E as reference electrode. By controlling the ionic s... In this paper is reported a new method of determining serum albumin with potentiometry. The silver ion selective electrode was used as working electrode and S. C. E as reference electrode. By controlling the ionic strength, PH and temperature constant, a good linear relationship was obtained between the cell potential and albumin concentration. This method .possessed characters-of operating simplicity, rapidity and directness. The samples could be detected directly and the results were in accordance with the values detected by classic K method. 展开更多
关键词 ion DETERMINATion OF SERUM ALBUMIN USING A SILVER ion selective ELECTRODE
下载PDF
Determination of Fluoride in Various Samples Using a Fluoride Selective Electrode
7
作者 Kamal Shaiyad Miya Vinay Kumar Jha 《Journal of Analytical Sciences, Methods and Instrumentation》 2020年第4期97-103,共7页
Fluoride is widespread in the environment, water, air, vegetation and Earth’s crust which can entre ground and surface water by natural process. Fluoride in minute quantities is essential component for human health a... Fluoride is widespread in the environment, water, air, vegetation and Earth’s crust which can entre ground and surface water by natural process. Fluoride in minute quantities is essential component for human health and help in normal mineralization of bone and formation of dental enamel. The determination of fluoride in some species was performed by using fluoride ion-selective electrode by direct measurement and standard addition method. The concentration of fluoride ion was determined in drinking water (from different place at Kathmandu), toothpaste, various brand of tea and coffees. The range of fluoride concentration in water sample was 0.16 to 0.39 mg/l, tea and coffee samples were 0.011 to 0.084 mg/l and its value of toothpaste was 0.026 to 0.75 mg/l. The concentration of fluoride ion obtain from different sample was compared with the legitimate value given by the world health organization. 展开更多
关键词 FLUORIDE TISAB Water TEA COFFEE TOOTHPASTE Fluoride ion selective Electrode Dental Carries
下载PDF
Ion Selective Electrode Determination of Ammonia Nitrogen in Passaic River Waste Water in New Jersey Essex County Area
8
作者 Yusuf Yildiz Recep Karadag +1 位作者 Mohammad Cheema Mohammad Sayedahmed 《American Journal of Analytical Chemistry》 2022年第3期96-107,共12页
The percent ammonia nitrogen was determined in Passaic River waste water using Ion-Selective Electrode EPA Method 350.3. The intelligent ammonia sensor integrates ammonia electrode, pH electrode and Ammonia Ion electr... The percent ammonia nitrogen was determined in Passaic River waste water using Ion-Selective Electrode EPA Method 350.3. The intelligent ammonia sensor integrates ammonia electrode, pH electrode and Ammonia Ion electrode together to realize the in situ detection of ammonia. The test results have shown that the sensor is easy operation, low cost and no pollution. The ammonia is determined potentiometrically using an ammonia ion selective electrode and a pH/mV meter, having an expanded millivolt scale. The ammonia selective electrode uses a hydrophobic gas-permeable membrane to separate the sample solution from an electrode internal solution of ammonium chloride. Dissolved ammonia is converted to NH<sub>3</sub> gas by raising the pH to above 11.0 with a strong base. NH<sub>3</sub> gas diffuses the membrane and changes the internal solution pH that is sensed by the electrode. In single laboratory test results have been found 1.001 NH<sub>3</sub>-/L and 0.897 mg NH<sub>3</sub>-N/L, recoveries were 77.3% and 83.1%, respectively. 展开更多
关键词 Ammonia-N Passaic River Waste Water ion selective Electrode
下载PDF
Molecular Design of Crown Ethers. 19~1. Synthesis of Novel Disulfide and Diselenide-Bridged Bis (benzo-12-crown-4)s and their Ag^+ Selective Electrode Properties 被引量:1
9
作者 Heng Yi ZHANG Yu LIU (Department of Chemistry, Nankai University, Tianjin 300071) 《Chinese Chemical Letters》 SCIE CAS CSCD 2000年第2期115-118,共4页
Two novel heteroatom-bridged his (benzo-12-crown-4 ether)s, i.e. his [2-nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for... Two novel heteroatom-bridged his (benzo-12-crown-4 ether)s, i.e. his [2-nitro-4,5 (1,4,7,10-tetraoxadecamethylene) disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for 1. Ion selective electrodes (ISE) for Ag+, containing 1 and 2 in PVC membrane as neutral carriers, were prepared, and their selectivity coefficients for Ag^+ (K_(Ag.M)^(pot)) were determined against other heavy metal ions, alkali and alkaline-earth metal ions. and ammonium ion. These ISEs showed excellent Ag^+ selectivities, log K_(Ag.M)^(pot) ≤ -3.8, against most of the interfering canons examined, except for Hg^+. 展开更多
关键词 Heteroatom-bridged his (benzo-12-crown-4 ether)s ion selective electrodes selectivity coefficients.
下载PDF
Free cupric ions in contaminated agricultural soils around a copper mine in eastern Nanjing City, China 被引量:4
10
作者 LUO Xiao-san ZHOU Dong-mei WANG Yu-jun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第5期927-931,共5页
To determine the environmental free metal ion activity was a recent hot issue. A method to measure low-level free cupric ion activity in soil solution extracted with 0.01 mol/L KNO3 was developed by using cupric ion-s... To determine the environmental free metal ion activity was a recent hot issue. A method to measure low-level free cupric ion activity in soil solution extracted with 0.01 mol/L KNO3 was developed by using cupric ion-selective electrode (ISE) and calibrating with Cu-buffer solution. Three copper buffers including iminodiacetic acid (IDA), ethylenediamine (EN), and glycine (Gly) were compared for calibrating the Cu-ISE curves in the range of free cupric ions (pCu^2+) 7-13. The Cu-EN buffer showed the best electrode response and thus was applied as the calibration buffer. The pCu^2+ of 39 contaminated agricultural soils around a copper mine was measured, ranging from 5.03 to 9.20. Most Cu in the soil solutions was found to be complexed with dissolved soil organic matters, averaging 98.1%. The proportion of free Cu^2+ ions in the soil solutions decreased with the increasing of solution pH. Soluble Cu and free Cu^2+ ions concentrations were analyzed by multiple linear regressions to evaluate the effects of soil properties on metal levels and speciation. The results showed that soil solution pH was the most significant factor influencing pCu^2+ (with R^2 value of 0.76), while not important for the soluble Cu concentration. 展开更多
关键词 copper ion selective electrode (Cu-ISE) free metal ion activity soil solution metal speciation BIOAVAILABILITY
下载PDF
Tetracycline selective electrode based on molecularly imprinted polymer particles 被引量:1
11
作者 Zhi Yong Guo Pan Pan Gai Jing Duan Hui Na Zhang Sui Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第10期1235-1238,共4页
Tetracycline selective electrode using molecularly imprinted polymer particles as quasi-ionophore was constructed the first time, and its performance was carefully characterized. Due to the specific recognition of tet... Tetracycline selective electrode using molecularly imprinted polymer particles as quasi-ionophore was constructed the first time, and its performance was carefully characterized. Due to the specific recognition of tetracycline by the particles, the selectivity coefficients for routine interferences were less than 10-4. Benefited from the absence of tetracycline in the sensitive membrane and the optimized composition of the inner filling solution, the limit of detection of the electrode was reduced to about 2.5 × 10^-8 mol/ L. It exhibited a good electrode slope 57.6 mV/decade near the theoretical Nernstian one, with a wide linear working range from 6.0 × 10^-8 to 1.0 × 10^-3 mol/L. The fabricated electrode should be used in pH 2--4, response time of which was less than 200 s when the concentration of tetracycline was higher than 1.0 × 10^-6 mol/L and no more than 30 min at the concentration of 1.0 × 10^-8 mol/L. 展开更多
关键词 ion selective electrode Molecular imprinting polymer Quasi-ionophore TETRACYCLINE
下载PDF
Study on the Multi-Sensing System Based on the Tin Oxide pH Electrode
12
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)
下载PDF
Porous Silicon as a Carrier of Sensing Materials in Sensors
13
作者 Ziqiang Zhu Li Shao Jian Zhang Jianzhong Zhu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期471-475,共5页
Novel potassium ion selective electrodes (K^+ISEs) and cDNA array sensors based on porous silicon (PS) have been developed.The calibration curve for the K^+ISEs is linear within a wide range of pK=2.0~6.0 with the sl... Novel potassium ion selective electrodes (K^+ISEs) and cDNA array sensors based on porous silicon (PS) have been developed.The calibration curve for the K^+ISEs is linear within a wide range of pK=2.0~6.0 with the slope of 56 mV per decade,which is near Nernst response.The response time and detection limit are within 31 s and 0.5μmol/L,respectively.The selective coefficient for Na^+ is-3.8,satisfies the requirement for the assay of blood potassium.The response variation is within 2 mV during 2 months.The binding capacity,the dynamic range and the detection limit of the DNA sensors were improved by replacing glass slide with PS substrates.The cDNA array sensors can bear 80℃of high temperature,75% of humidity,3.6 kLx of irradiation and keep stable within 10 days when they are exposed in air.Good performances of the K^+ISE and the cDNA array sensor are attributed to the large internal surface area and the easily modified microstructure of PS. 展开更多
关键词 porous silicon potassium ion selective electrode cDNA array sensor
下载PDF
Novel potentiometric application for the determination of amprolium HCl in its single and combined dosage form and in chicken liver 被引量:1
14
作者 Mai A. Basha Mohamed K. Abd El-Rahman +1 位作者 Lories I. Bebawy Maissa Y. Salem 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第3期612-618,共7页
Three novel amprolium HCl(AMP)-selective electrodes were investigated with 2-nitrophenyl octylether as a plasticiser in a polymeric matrix of polyvinyl chloride(PVC). Sensor I was fabricated using potassium tetra... Three novel amprolium HCl(AMP)-selective electrodes were investigated with 2-nitrophenyl octylether as a plasticiser in a polymeric matrix of polyvinyl chloride(PVC). Sensor I was fabricated using potassium tetrakis(4-chlorophenyl) borate(Tp ClPB) as a cationic exchanger without incorporation of an ionophore.Sensor Ⅱ used 2-hydroxy propyl β-cyclodextrin as an ionophore while sensor Ⅲ used p-tert-butylcalix[8]arene as an ionophore. The three proposed sensors showed Nernestian response slopes of 29.2±0.8,29.3±0.6 and 30.2±0.4 m V/decade over the concentration range from 10–6 to 10–2 mol L_(-1),respectively. The proposed sensors displayed useful analytical characteristics for the determination of AMP in bulk powder, different pharmaceutical formulations, and chicken liver and in the presence of ethopabate. The proposed method was validated according to ICH guidelines for its linearity, accuracy,precision and robustness. 展开更多
关键词 Amprolium HCl Cationic exchanger ionophore ion selective electrodes Ethopabate Chicken liver
原文传递
Mean Activity Coefficients of KCI in the KCI-K2B4O7-H2O Ternary System at 308.15 K by EMF Method 被引量:1
15
作者 ZHONG Si-yao SANG Shi-hua ZHANG Jun-jie 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2013年第6期1189-1192,共4页
The mean activity coefficients of KCI in a KCI-K2B407-H20 ternary system were experimentally determined at 308.15 K by the electromotive force measurement(EMF) via a battery cell without a liquid junction: K-ISEIKC... The mean activity coefficients of KCI in a KCI-K2B407-H20 ternary system were experimentally determined at 308.15 K by the electromotive force measurement(EMF) via a battery cell without a liquid junction: K-ISEIKCI(m1), K2B4O7(m2)ICI-ISE(ISE=ion selective electrode) in a total ionic strength of from 0.01 mol/kg to 1.00 mol/kg at different ionic strength fractions of KzB407 with yB=0, 0.200, 0.400, 0.600 and 0.800. K-ISE and CI-ISE presented a good Nernst effect, which implies that this method could be used to measure the activity coefficients of an electrolyte in the above system. The Harned rule was fitted to the experimental data, the Harned coefficients and the Pitzer single-salt ion parameters of KC1 were evaluated, and the relationship diagrams between the mean activity coefficient of KC1 and the ionic strength fraction(yB) were drawn. The mean activity coefficients of KCI(γ±KCI) decreased monotonically with the increase of I. The experimental results obeyed the Harned rule well. 展开更多
关键词 Activity coefficient Electromotive force measurement ion selective electrode Potassium chloride Potassium borate
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部