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ID 33012
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Author
Sabarudin, Akhmad
Oshima, Mitsuko
Motomizu, Shoji
Abstract
The analytical method for the determination of phosphorus in ultrapurified water was developed. Ultrapurified water was evaporated to concentrate phosphorus and the final sample volume for analysis was 10 ml. In 0.55 mol 1(-1) HCl, orthophosphate forms molybdophosphate, and then the molybdophosphate forms ion associate with Malachite Green (MG), which can be collected on a tiny membrane filter (diameter: 5 mm, and effective filtering diameter: 2 mm). After the ion associate on the membrane filter is dissolved together with the membrane filter in I ml of methyl cellosolve (MC), the absorbance of MC solution is measured at 627 nm by a flow injection-spectrophotometric detection technique. When 10 ml of the sample solution was used for the procedures and absorbance measurement, the calibration graph is linear up to about 500 ng 1(-1) of phosphorus and the detection limit was 8 ng 1(-1) (S/N = 3). For the determination of phosphorus in an ultrapurified water, 10-40 ml of sample solutions were transferred into poly(tetrafluoroethylene) (PTFE) beaker and evaporated to 5 ml or to dryness. To them, 0.003 mol 1(-1) HCl was added to get 10 ml of final solution, which was used as sample. Phosphate is determined by comparing the slope of the varied sample volume after evaporation/concentration with a slope of the standard calibration graph (a slope comparison method: SCM). The SCM enables to evaluate the concentration of phosphate in ultrapurified waters more sensitively and accurately.
Keywords
ultrapurified water
evaporation/concentration
ion associate
molybdophosphate
malachite green
slope comparison method
Note
Published with permission from the copyright holder.
This is published in Analytica Chimica Acta, 2003 Vol.481 Issue.2 pp.311-319
Publisher URL: http://dx.doi.org/10.1016/S0003-2670(03)00082-5
Direct access to Thomson Web of Science record
(C)2003 by Elsevier Science B.V.
Published Date
2003-04-03
Publication Title
Analytica Chimica Acta
Volume
volume481
Issue
issue2
Publisher
Elsevier Science B.V.
Start Page
311
End Page
319
ISSN
0003-2670
NCID
AA00524834
Content Type
Journal Article
language
英語
Copyright Holders
Elsevier Science B.V.
File Version
author
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/28