Analytical Communications最新文献

Determination of Pb-bound ligands in human amniotic fluid by HPSEC-ICP-MS 人羊水中铅结合配体的hplc - icp - ms测定

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900478E

G. Hall, Xiangping Zhu, Eugene G. Martin

引用次数: 4

Electrostatic ion chromatography using hydroxide solutions as mobile phase with suppressed conductivity detection 以氢氧化物溶液为流动相，抑制电导率检测的静电离子色谱法

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A904668B

Wenzhi Hu, P. Haddad, K. Hasebe, Kazuhiko Tanaka

{"title":"Electrostatic ion chromatography using hydroxide solutions as mobile phase with suppressed conductivity detection","authors":"Wenzhi Hu, P. Haddad, K. Hasebe, Kazuhiko Tanaka","doi":"10.1039/A904668B","DOIUrl":"https://doi.org/10.1039/A904668B","url":null,"abstract":"An electrostatic ion chromatography (EIC) method for the separation of inorganic anions with detection by suppressed conductivity has been developed, in which analyte retention times can be manipulated by variation of the composition of the mobile phase. A stationary phase prepared by coating silica-based octadecyl material with a sulfobetaine zwitterionic surfactant (Zwittergent 3-14) has been used in conjunction with aqueous hydroxide solutions as the mobile phase. Inorganic anions were eluted in the order SO42– < F– < Cl– < NO2– < Br– < NO3– < ClO3– < I–, with retention times increasing with increasing concentration of hydroxide in the mobile phase. Retention times were also dependent on the nature of the counter-cation in the mobile phase, with divalent cations such as Ca2+ and Ba2+ showing longer retention times than monovalent cations such as Li+ and Na+. A retention mechanism involving formation of a binary electrical double layer is proposed, with the thickness of the double layer (and hence analyte retention) being dependent on the concentration of the mobile phase. The EIC system showed high sensitivity for the analyte ions due to the efficiency of the suppression reaction. Detection limits for SO42–, F–, Cl–, NO2–, Br– and NO3– were less than 1.0 × 10–7 mol L–1, whilst those for ClO3– and I– were 3.0 × 10–7 mol L–1 and 7.0 × 10–7 mol L–1, respectively, for a sample injection volume of 100 µL.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"51 1","pages":"309-312"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75957490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Isodispersion curves in flow injection analysis 流动注射分析中的等散曲线

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A909083E

D. Vãireanu, P. Fielden, R. Snook

引用次数: 0

The preparation of a sol–gel glass oxygen sensor incorporating a covalently bound fluorescent dye 含有共价结合荧光染料的溶胶-凝胶玻璃氧传感器的制备

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A808731H

C. Malins, H. Glever, B. MacCraith, S. Fanni, J. Vos

引用次数: 52

The monitoring of the curing of plastic coatings on steel strip by infrared spectroscopy 用红外光谱法监测钢带塑料涂层的固化

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A903696B

Rhobert Lewis, Christopher Morgan, J. Miasik

引用次数: 0

Determination of D-fructose in foodstuffs by an improved amperometric biosensor based on a solid binding matrix 基于固体结合基质的改进安培生物传感器测定食品中的d -果糖

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900048H

M. Streďanský, A. Pizzariello, S. Stredanska, S. Miertus

{"title":"Determination of D-fructose in foodstuffs by an improved amperometric biosensor based on a solid binding matrix","authors":"M. Streďanský, A. Pizzariello, S. Stredanska, S. Miertus","doi":"10.1039/A900048H","DOIUrl":"https://doi.org/10.1039/A900048H","url":null,"abstract":"An improved amperometric biosensor based on a solid binding matrix (SBM) composite transducer has been used for the determination of D-fructose in foodstuffs samples. The enzyme, D-fructose dehydrogenase (EC 1.1.99.11), was incorporated directly into a solid composite transducer containing both 2-hexadecanone as SBM and chemically modified graphite. Hexacyanoferrate(III) was used as a redox mediator and the current variation caused by the presence of D-fructose was measured amperometrically. The electrochemical properties and the characteristics of the composite fructose biosensors are described. The amperometric signals were fast, reproducible and linearly proportional to D-fructose concentrations in the range 50 × 10–6–10 × 10–3 mol l–1, with a correlation coefficient of 0.999. A set of measurements at +0.20 V versus SCE for 2 × 10–3 mol l–1D-fructose yielded a relative standard deviation for the steady-state current of 2.11%. The use of a chemically modified graphite by a mild oxidation step was shown to improve the biosensor selectivity against anionic interferents such as L-ascorbate. The biosensor proved to be stable for 6 months and the assay of D-fructose by this electrode was not influenced by the presence of sugars or other interferents commonly found in food samples. The biosensor was used for the determination of D-fructose in some food samples, and the results were consistent with those obtained with the commercially available D-fructose enzyme photometric kit.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"118 1","pages":"57-61"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87654152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 34

Maximising microdialysis sampling by optimising the internal probe geometry 通过优化内部探针几何形状来最大化微透析采样

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A901175G

N. Torto, L. Gorton, E. Mikeladze, E. Csöregi, T. Laurell

引用次数: 13

Imprinted polymer-based enantioselective acoustic sensor using a quartz crystal microbalance 采用石英晶体微天平的印迹聚合物对映选择性声学传感器

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A907844D

K. Haupt, K. Noworyta, W. Kutner

引用次数: 124

Evaluation of internal standardisation in electrothermal atomic absorption spectrometry 电热原子吸收光谱法内部标准化评价

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A809096C

B. Radziuk, N. Romanova, Y. Thomassen