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PRECONCENTRATION OF TRACE ZINC IN SEAWATER ON CPPI RESIN BY FIA AND ON-LINE DETECTION BY ICP-AFS
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作者 Dong Xing YUAN Peng Yuan YANG Xiao Ru WANG Ben Li HUANG Department of Chemistry,Xiamen University,Xiamen,361005 《Chinese Chemical Letters》 SCIE CAS CSCD 1990年第3期237-238,共2页
A quite new type of chelating resin Carboxymethylated Polyethylenimine-Polymethylenepolyphenylene Isocyanate(CPPI)is used for the preconcentration of Zn from high salt water such as seawater. The preconcentration is c... A quite new type of chelating resin Carboxymethylated Polyethylenimine-Polymethylenepolyphenylene Isocyanate(CPPI)is used for the preconcentration of Zn from high salt water such as seawater. The preconcentration is controlled through the technique of Flow Injection Analysis(FIA).The concentrated sample solution is then directly transferred to an Inductively Coupled Plasma-Atomic Fluorescence Spectrometer(ICP-AFS)for determination.The detection limit of Zn by the technique is about 0.06 ppb. 展开更多
关键词 CPPI preconcentration OF TRACE ZINC IN SEAWATER ON CPPI RESIN BY fiA AND on-line DETECTION BY ICP-AFS fiA ICP LINE
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Cobalt Determination by Means of Flow Injection On-line Sorbent Preconcentration-Flame Atomic Absorption Spectrometry with 1-Nitroso-2-naphthol as a Complexing Reagent
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作者 YIN Xue-feng ALI Akbar +3 位作者 XU Guang-ming LING Yun-yang GAO Jian YE Mei-ying 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2001年第3期264-270,共7页
The suitability of 1-nitroso-2-naphthol(NN) as a complexing agent for on-line preconcentration of cobalt eluted on the C_(18) microcolumn by means of the FI-FAAS system was tested. Various parameters affecting the com... The suitability of 1-nitroso-2-naphthol(NN) as a complexing agent for on-line preconcentration of cobalt eluted on the C_(18) microcolumn by means of the FI-FAAS system was tested. Various parameters affecting the complex formation and its elution were optimized. A 2.3×10^(-3) mol/L reagent solution and the aqueous sample solution acidified with 0.1% (volume fraction) nitric acid were on-line mixed (6.4 mL/min) on a reaction coil set at (65±1)℃ and flowed through the microcolumn for 30 s. The pH of the mixed solution was adjusted to 3—4 with HNO_3(1 mol/L) or NaOH(1 mol/L). The adsorbed complexes in the microcolumn were eluted into the nebulizer of FAAS in 10 s with ethanol acidified with 1% HNO_3(3.0 mL/min). A good precision(1.6% for 100μg/L Co(Ⅱ), n=10), a high enrichment factor 17.2, with detection limit (3σ) 3.2μg/L, and sample throughput (90 h^(-1)) were obtained. The method was applied to the certified reference materials(CRMs), NBS-362 and NBS-364, for the determination of cobalt and the results were in good agreement with the certified values. 展开更多
关键词 Cobalt fi on-line preconcentration AAS 1-Nitroso-2-naphthol
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Sequential injection spectrophotometric determination of nanomolar nitrite in seawater by on-line preconcentration with HLB cartridge 被引量:4
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作者 ZHANG Min YUAN Dongxing +2 位作者 HUANG Yongming CHEN Guohe ZHANG Zhen 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2010年第1期100-107,共8页
The unstable state of nitrite results in its very low concentration in seawater, which is below the limit of detection (LOD) of conventional techniques of analysis. Some sensitivity-enhanced methods have been propos... The unstable state of nitrite results in its very low concentration in seawater, which is below the limit of detection (LOD) of conventional techniques of analysis. Some sensitivity-enhanced methods have been proposed for the determination of nitrite at nanomolar level to illustrate the role of nitrite in the marine nitrogen cycle. However, most of previous reports are not widely accepted, because of their complexity and cost equipment or intensive labor requirement. In this study, a simple automatic system for the determination of nanomolar level nitrite using on-line preconcentration with spectrophotometric detection was described..An Oasis HLB cartridge was adopted to quantitatively enrich the pink-colored azo compound, formed from nitrite via Griess reaction. The cartridge was rinsed with water and ethanol (volume fraction is 55%, the same below), in turn, then eluted by an eluent containing 50% ethanol and 0.25 M(mol/dm^3) H2SO4, and determined at 543 nm with a 2 cm path-length flow cell. Under the optimized experimental conditions, the calibration curve showed a good linearity in the range of 1.4 85.7 aM, and the LOD (3a) was estimated to be 0.5 nM. The relative standard deviations of 7 measurements were 4.0% and 1.0% for the samples spiked at 7.1 and 28.6 nM, respectively. The recoveries for the different natural water samples were between 92.2%-108.4%. Each HLB cartridge could be reused for at least 50 times. As compared with other SPE methods, the advantages of this method included the free of interference from salinity variation and less sample consuming. The results of the application of the proposed method to natural water showed good agreement with liquid waveguide capillary cell detection method. 展开更多
关键词 NITRITE seawater on-line preconcentration sequential injection solid phase extraction
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Flow-Injection Microcolumn on-Line Preconcentration for theDetermination of Chromium(Ⅵ) 被引量:1
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作者 Ma Wanhong Cat Ruxiu Lin Zhixin(College of Chemistry, Wuhan University. Wuhan 430072, China) 《Wuhan University Journal of Natural Sciences》 CAS 1998年第4期464-468,共5页
A rapid and sensitive on-line preconcentration method for spectrophotometric determination of chromium (VI) in nature water is described. Preconcentration and determination are based on (i) the quantitative and fast a... A rapid and sensitive on-line preconcentration method for spectrophotometric determination of chromium (VI) in nature water is described. Preconcentration and determination are based on (i) the quantitative and fast adsorption of chromium (VI) on the high surface area nanometer-size TiO2 (anatase) powders, which prepared by a sol-gel method from hydrolysis of TiCI4 and (ii) the quantitative and reproducible elution of Cr (VI) by 2. 0 mol. L-1 HCI. A mini-column system for preconcentration is developed, Cr(VI)on the mini-column is eluted and merged with a stream water and DPCB (1, 5-diphenylcarbazide ) as the chromogenic reagent. The Proposed system permits throughputs of 6 sample h--l (0. 001 μg mL-1 Cr(VI) ) or 20 sample h-1 (0. 1 μg mL-1Cr (VI) . The preconcentration factor is 55. The detection limit is 0. 8 ng·mL-1 Cr(VI). The reproducibility is satisfactory with a relative standard deviation of less than 3. 35% (0. Of μg'mL-1Cr (VI), n = 5). 展开更多
关键词 anometer-size TiO2 Cr (Ⅵ) determination on-line preconcentration flow-injection spectrophotometric detection
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PMOXA/PAA Brushes toward on-Line Preconcentration for BSA in Capillary Electrophoresis
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作者 Xiao-ru Liu Chao Pan Yan-mei Wang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第4期497-507,I0003,共12页
In this work, a binary-mixed-brushes-coated (BBC) capillary with switchable protein adsorption/desorption properties was developed and applied for on-line preconcentration of proteins. Firstly, amine-terminated poly(2... In this work, a binary-mixed-brushes-coated (BBC) capillary with switchable protein adsorption/desorption properties was developed and applied for on-line preconcentration of proteins. Firstly, amine-terminated poly(2-methyl-2-oxazoline)(PMOXA-NH2) and thiolterminated poly(acrylic acid)(PAA-SH) were synthesized by using cationic ring-opening polymerization (CROP) and reversible addition fragmentation chain transfer (RAFT) polymerization, respectively. Then, the BBC capillary based on poly(2-methyl-2-oxazoline)(PMOXA) and poly(acrylic acid)(PAA) was prepared by sequentially grafting of PMOXA-NH2 and PAA-SH onto fused-silica capillary inner surface through poly(dopamine)(PDA) as an anchor. The obtained PMOXA/PAA coating formed on the capillary or capillary's raw material was characterized in terms of the thickness, surface chemical composition by using scanning electron microscope (SEM) and X-ray photoelectron spectrum (XPS). The switchable protein adsorption/desorption performance of the BBC capillary was investigated by using fluorescence microscope under di erent solutions with certain pH and ionic strength(I). The results showed that bovine serum albumin (BSA) could be adsorbed on BBC capillary at pH=5.0 (I=10^-5 mol/L), and then the adsorbed BSA could be released at pH=9.0 (I=0.1 mol/L). This switchable protein adsorption/desorption property of coated capillary was then used to preconcentrate proteins on-line for increasing the detection sensitivity of BSA in capillary electrophoresis (CE). With this method, a sensitivity enhancement factor (SEF) more than 5000 for BSA detection was obtained. 展开更多
关键词 Mixed brush coating Switchable properties on-line preconcentration Capillary electrophoresis Detection sensitivity
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DETERMINATION OF ANTIMONY IN WATER SAMPLES BY FLOW-INJECTION HYDRIDE GENERATION ATOMIC ABSORPTION SPECTROMETRY WITH ON-LINE ION-EXCHANGE COLUMN PRECONCENTRATION
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作者 Shu Kun XU and Zhao Lun FANG Institute of Applied Ecology, Academia Sinica, Shenyang, 110015 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第11期915-918,共4页
On-line ion-exchange separation and preconcentration were combined with flow-injection hydride generation atomic absorption spectrometry (HGAAS) to determine ultra-trace amounts of antimony in water samples. Antimony(... On-line ion-exchange separation and preconcentration were combined with flow-injection hydride generation atomic absorption spectrometry (HGAAS) to determine ultra-trace amounts of antimony in water samples. Antimony(Ⅲ) was preconcentrated on a micro-column packed with CPG-8Q chelating ion-exchanger using time-based sample loading and eluted by 4 mol l^(-1) HCl directly into the hydride generation AAS system. A detection limit (3σ) of 0.0015μg l^(-1) Sb(Ⅲ) was obtained on the basis of a 20 fold enrichment and with a sampling frequency of 60h^(-1). The precision was 1.0% r.s.d.(n=11) at the 0.5μg l^(-1) Sb(Ⅲ) level. Recoveries for the analysis of antimony in tap water, snow water and sea water samples were in the range 97-102%. 展开更多
关键词 Zhang DETERMINATION OF ANTIMONY IN WATER SAMPLES BY FLOW-INJECTION HYDRIDE GENERATION ATOMIC ABSORPTION SPECTROMETRY WITH on-line ION-EXCHANGE COLUMN preconcentration SQ CPG ION LINE
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Iodine Determination by Microwave Plasma Torch Atomic Emission Spectrometer Coupled with Online Preconcentration Vapor Generation Technique 被引量:4
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作者 FEI Yan-qun LUO Gui-min +4 位作者 FENG Guo-dong CHEN Huan-wen FEI Qiang HUAN Yan-fu JIN Qin-han 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2008年第5期546-549,共4页
This article focuses on iodine determination by microwave plasma torch atomic emission spectrometry (MPT-AES) coupled with online preconcentration vapor generation method. A new desolvation device, multistrand Nafio... This article focuses on iodine determination by microwave plasma torch atomic emission spectrometry (MPT-AES) coupled with online preconcentration vapor generation method. A new desolvation device, multistrand Nafion dryer, was used as the substitute for condenser desolvation system. Some experimental conditions, such as preconcentration time, acidity of sample solution, rinsing solution acidity and dynamic linear range were investigated and optimized. The new desolvation system eliminates the problem of decreasing emission intensity of I(I) 206.238 nm line with the increase of working time on a conventional condenser desolvation system, thus greatly improving the reproducibility. 展开更多
关键词 MPT-AES on-line preconcentration Vapor generation Nation dryer Membrane desolvation
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微柱固相萃取-电感耦合等离子体质谱联用技术用于测定高盐样品中痕量的铅 被引量:21
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作者 杨朝勇 陈发荣 +2 位作者 庄峙厦 谷胜 王小如 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2001年第5期1062-1066,共5页
建立了微柱固相萃取 -电感耦合等离子体质谱联用系统 .对萃取体系的 p H、洗脱液酸度及流速进行了优化选择 .在最佳的分离条件下 Pb的检测限 (3σ,n=6)为 0 .0 3ng/ m L,测定海水的铅的RSD为 2 .6% .该系统成功地应用于实际样品和标准... 建立了微柱固相萃取 -电感耦合等离子体质谱联用系统 .对萃取体系的 p H、洗脱液酸度及流速进行了优化选择 .在最佳的分离条件下 Pb的检测限 (3σ,n=6)为 0 .0 3ng/ m L,测定海水的铅的RSD为 2 .6% .该系统成功地应用于实际样品和标准参考物的在线分离富集和测定 . 展开更多
关键词 电感耦合等离子体质谱 在线富集分离 海水 固相萃取 高盐样品 水污染监测 含量测定
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火焰原子吸收光谱法测定水样中痕量镉——用流动注射-编结反应器对痕量镉作在线预富集 被引量:7
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作者 苏耀东 王中瑗 +2 位作者 李卓 王敏 甘礼华 《理化检验(化学分册)》 CAS CSCD 北大核心 2008年第9期818-820,823,共4页
在火焰原子吸收光谱测定水样中痕量镉的方法中,提出了在流动注射-编结反应器对痕量镉离子作在线预富集中用两次引入作为镉离子的配位体的吡咯烷二硫代氨基甲酸铵(APDC)溶液的模式。在此模式中,预先将APDC溶液涂覆在编结反应器的内壁上(... 在火焰原子吸收光谱测定水样中痕量镉的方法中,提出了在流动注射-编结反应器对痕量镉离子作在线预富集中用两次引入作为镉离子的配位体的吡咯烷二硫代氨基甲酸铵(APDC)溶液的模式。在此模式中,预先将APDC溶液涂覆在编结反应器的内壁上(这就是第一次引入APDC溶液);第二次引入是将APDC溶液与试样溶液同时注入并在编结反应器中汇合。富集时样品溶液的流速为6.0mL·min^(-1),富集时间为60s。按此方法操作镉的富集系数达到21,此值均高于单独用APDC溶液预涂覆编结反应器模式的富集系数(9)或单独用APDC溶液与试样溶液同时注入并汇合模式的富集系数(16)。方法的检出限(S/N=3)为0.32μg·L^(-1),方法的进样频率为每小时36个样品,对20μg·L^(-1)镉标准溶液测定11次,测得方法的相对标准偏差为2.7%。应用此方法测定了几个水样中镉含量,并作回收试验,所得回收率在92.0%~99.0%之间。 展开更多
关键词 火焰原子吸收光谱法 流动注射-在线预富集 编结反应器 水样
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流动注射在线吸着分离预浓集冷蒸气原子吸收法测定痕量镉 被引量:7
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作者 姚波 徐淑坤 方肇伦 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2001年第8期1301-1304,共4页
研究了 IRC-71 8离子交换树脂、 1 2 2螯合树脂和 Muromac A-1树脂对镉的预浓集条件 ,建立了超痕量镉的流动注射在线吸着分离预浓集冷蒸气发生原子吸收光谱测定方法 .在每小时进样 60 ,60和 4 5次速度下检出限 ( 3σ)分别为 3.0 ,3.0和 ... 研究了 IRC-71 8离子交换树脂、 1 2 2螯合树脂和 Muromac A-1树脂对镉的预浓集条件 ,建立了超痕量镉的流动注射在线吸着分离预浓集冷蒸气发生原子吸收光谱测定方法 .在每小时进样 60 ,60和 4 5次速度下检出限 ( 3σ)分别为 3.0 ,3.0和 2 .4 ng/L.线性范围 0~ 0 .3μg/L,对 0 .2 μg/L镉测定的相对标准偏差为2 .0 %~ 2 .6% ( n=1 1 ) .讨论了用这 3种离子交换树脂微柱进行分离预浓集时条件参数的优化、抗干扰能力以及对天然水样的回收率 。 展开更多
关键词 流动注射 吸着分离浓集 冷蒸气发生 原子吸收光谱 痕量分析
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流动注射-电感耦合等离子体质谱应用现状及进展 被引量:11
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作者 吕元琦 尹明 李冰 《岩矿测试》 CAS CSCD 北大核心 2001年第2期115-124,130,共11页
从样品引入、在线稀释、在线同位素稀释、在线气体发生、在线分离预浓集和其他在线处理手段等方面对流动注射 -电感耦合等离子体质谱的应用进行了描述 ,对其发展进行了展望。引用文献
关键词 流动注射 电感耦合等离子体质谱 在线稀释 在线同位素稀释 在线气体
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开口毛细管预富集结合流动注射测定痕量铁的研究 被引量:2
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作者 金谷 李吉峰 杨键 《理化检验(化学分册)》 CAS CSCD 北大核心 2004年第9期497-500,共4页
通过开口毛细管结合流动注射分析系统建立了一个新的高灵敏和高选择性的测定痕量铁的方法。这种开口毛细管是通过用强碱处理聚四氟乙烯毛细管内表面而制成的。高铁离子与2 (2 羟基 4 吡啶偶氮)聚氧乙烯醚(PE·PAR)在碱性条件下(pH10... 通过开口毛细管结合流动注射分析系统建立了一个新的高灵敏和高选择性的测定痕量铁的方法。这种开口毛细管是通过用强碱处理聚四氟乙烯毛细管内表面而制成的。高铁离子与2 (2 羟基 4 吡啶偶氮)聚氧乙烯醚(PE·PAR)在碱性条件下(pH10.0)因形成带正电的络合物则被带负电的毛细管内壁吸附。相同情况下,常见的二价金属离子生成中性络合物而可以与高铁离子分离,从而消除了常见基质中金属离子的干扰。即在富集高铁离子的同时,有效地提高了选择性。方法的线性范围在0.5~40μg·L-1之间,对1.0μg·L-1Fe3+7次平行测定的相对标准偏差小于2.5%。检出限为0.03μg·L-1,表观摩尔吸光系数为1.08×106L·mol-1·cm-1,样品测定的回收率在95%~98%之间,用于水样的测定结果较为满意。 展开更多
关键词 开口毛细管 预富集 流动注射 痕量分析
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开口毛细管的化学修饰及富集和测定水体中微量蛋白质 被引量:1
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作者 金谷 张蕾 杨健 《理化检验(化学分册)》 CAS CSCD 北大核心 2005年第10期721-725,共5页
将聚四氟乙烯毛细管用聚乙烯醇交联涂层后,偶联上活性三嗪染料Cibacron BlueF3GA,制成一种新型的亲合染料Cibacron Blue F3GA修饰的聚四氟乙烯亲合毛细管.以牛血清白蛋白(BSA)作为模型蛋白进行在线富集和检测.方法依据亲合毛细管将低浓... 将聚四氟乙烯毛细管用聚乙烯醇交联涂层后,偶联上活性三嗪染料Cibacron BlueF3GA,制成一种新型的亲合染料Cibacron Blue F3GA修饰的聚四氟乙烯亲合毛细管.以牛血清白蛋白(BSA)作为模型蛋白进行在线富集和检测.方法依据亲合毛细管将低浓度的蛋白质溶液在线预富集后,以KSCN溶液洗脱并形成较高浓度的蛋白质溶液,用偶氮胂K光度法在线定量测定.PVA和Cibacron Blue F3GA的固载量分别为8.6 μmol·g-1和0.434 mmol·g-1.毛细管容量为0.58 mg·cm-2BSA.这种分析系统适合微量和痕量蛋白质的在线富集和分析.对常见无机离子及有机物的干扰作了试验,结果表明方法的选择性较好.BSA的线性范围为0~200μg·L-1,检出限为1.5μg·L-1,方法用于水体中蛋白质的测定,回收率在99%~102%之间. 展开更多
关键词 fi-在线富集及分析系统 光度法 蛋白质 偶合
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流动注射预富集-液相色谱联机测定痕量镍、铜、汞的研究 被引量:6
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作者 A.Ali 沈宏 +1 位作者 徐光明 殷学锋 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 1998年第11期1746-1748,共3页
萃取-液相色谱用于同时测定痕量金属离子已引起广泛重视[1~3],但操作方法繁琐,样品易玷污[4].我们曾用固相萃取的方法使金属离子衍生为二乙基二硫代氨基甲酸盐(DTC)配合物富集后,继以HPLC分离测定了钴、铜和汞[... 萃取-液相色谱用于同时测定痕量金属离子已引起广泛重视[1~3],但操作方法繁琐,样品易玷污[4].我们曾用固相萃取的方法使金属离子衍生为二乙基二硫代氨基甲酸盐(DTC)配合物富集后,继以HPLC分离测定了钴、铜和汞[5].本文研究了流动注射固相萃取预... 展开更多
关键词 fi-HPLC联机 HPLC 测定
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火焰原子吸收光谱法测定水样中铜离子 被引量:9
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作者 赵微微 赵松林 梁华定 《科学技术与工程》 2007年第19期5039-5041,共3页
研究了流动注射氧化碳纳米管在线固相吸附预富集火焰原子吸收光度法测定水溶液中痕量铜。对实验条件进行了优化。在pH6.0时,吸附预富集60s的条件下样品流速为3.2mL·min-1,然后用流速为2.8mL·min-1的1.0mol·L-1的HCl洗脱... 研究了流动注射氧化碳纳米管在线固相吸附预富集火焰原子吸收光度法测定水溶液中痕量铜。对实验条件进行了优化。在pH6.0时,吸附预富集60s的条件下样品流速为3.2mL·min-1,然后用流速为2.8mL·min-1的1.0mol·L-1的HCl洗脱,直接送入FAAS进行检测,得到铜的吸收信号的增感因子为17,检出限(3σ)为0.78μg·L-1,对5μg·L-1的Cu标准溶液11次平行测定,精密度(RSD)为3.8%。此法已成功应用于水样的分析。 展开更多
关键词 流动注射 火焰原子吸收 氧化多壁碳纳米管 吸附预富集 CU
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Oscillographic Chronopotentiometry with High and Low Frequency Current 被引量:1
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作者 Jian Bin ZHENG Xiu Qi ZHANG Hong GAO (Institute of Electroanalytical Chemistry. Northwest University.Xi’an 710069) 《Chinese Chemical Letters》 SCIE CAS CSCD 2000年第5期443-446,共4页
A novel electroanalytical method. oscillographic chronopotentiometry with high and low frequency current. is presented in this paper. With this method, the sensitivity or almost all kinds of oscillographic chronopoten... A novel electroanalytical method. oscillographic chronopotentiometry with high and low frequency current. is presented in this paper. With this method, the sensitivity or almost all kinds of oscillographic chronopotentiometry can be: enhanced about one order. 展开更多
关键词 STRIPPING on-line preconcentration oscillographic chronopotentiometry
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Determination of strychnine and brucine in traditional Chinese medicine preparations by capillary zone electrophoresis with micelle to solvent stacking 被引量:2
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作者 Xiao Fang Yin Zhi Li Shuai Hua Zhang Chun Xia Wu Chun Wang Zhi Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第3期330-333,共4页
A novel micelle to solvent stacking on-line sample preconcentration technique in capillary zone electrophoresis(MSS-CZE) has been developed to determine the strychnine and brucine in traditional Chinese medicine pre... A novel micelle to solvent stacking on-line sample preconcentration technique in capillary zone electrophoresis(MSS-CZE) has been developed to determine the strychnine and brucine in traditional Chinese medicine preparations.The optimal running buffer was 30 mmol/L H_3PO_4 containing 20%acetonitrile at pH 4.0.The sample matrix was 8 mmol/L H_3PO_4 containing 5 mmol/L sodium dodecyl sulfate(SDS) at pH 3.0.The established MSS-CZE method afforded more than 50-fold improvements in concentration sensitivity compared with typical CZE-UV analysis.The calibration curve was linear in the range from 0.2 to 15.0μg/ mL for both strychnine and brucine,with correlation coefficients of 0.9984 and 0.9976,respectively.The limits of detection(5/ N = 3:1) for strychnine and brucine were 0.02 and 0.05μg/mL,respectively.The MSS-CZE method has been successfully applied to the analysis of strychnine and brucine in Chinese medicinal preparations. 展开更多
关键词 on-line sample preconcentration Micelle to solvent stacking Capillary zone electrophoresis STRYCHNINE BRUCINE Traditional Chinese medicine preparation
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