Stopped-flow injection simultaneous determination of phosphate and silicate using molybdenum blue

被引：52

作者：

Grudpan, K ^{[1
]}

Ampan, P

Udnan, Y

Jayasvati, S

Lapanantnoppakhun, S

Jakmunee, J

Christian, GD

Ruzicka, J

机构：

[1] Chiang Mai Univ, Dept Chem, Fac Sci, Chiang Mai 50200, Thailand

[2] Chiang Mai Univ, Inst Sci & Technol Res & Dev, Chiang Mai 50200, Thailand

[3] Chiang Mai Univ, Dept Radiol, Fac Med, Chiang Mai 50000, Thailand

[4] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

TALANTA | 2002年 / 58卷 / 06期

关键词：

stopped-FI; simultaneous determination; phosphate; silicate; molybdenum blue; kinetics;

D O I：

10.1016/S0039-9140(02)00441-1

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Kinetic information for the phosphate-molybdate-ascorbic acid reaction can be obtained by making use of a very simple manually operated stopped-flow injection (FI) system. Various parameters (concentrations of reagents, flow rate, mixing coils, and volume of flow cell) were investigated for determination of phosphate. A stopped-FI system should be arranged for low degree of mixing (of reactants) and low dispersion so that good signals of rate changes will be observed. Simultaneous determination of phosphate and silicate by the stopped-FI technique is proposed, using a laboratory-made semi-automatic stopped-FI Analyzer with LED-based photometer. It is based on kinetic separation of phosphate and silicate using molybdenum blue. The proposed procedure has been demonstrated for the application to water samples. The results obtained agree with that of a standard method. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：1319 / 1326

页数：8

共 24 条

[1]

[Anonymous], STAND METH EX WAT WA

[2] KINETIC STUDY ON INFLUENCE OF PARAMETERS IN DETERMINATION OF INORGANIC-PHOSPHATE BY MOLYBDENUM BLUE REACTION [J].