Indirect Trace Determination of Ethylenediminetetraacetic Acid (Edta) in Water by Potentiometric Stripping Analysis
作者:
Manar Fayyad,
Maha Tutunji,
Ziad Taha,
期刊:
Analytical Letters
(Taylor Available online 1988)
卷期:
Volume 21,
issue 8
页码: 1425-1432
ISSN:0003-2719
年代: 1988
DOI:10.1080/00032718808059874
出版商: Taylor & Francis Group
关键词: EDTA determination;potentiometric stripping analysis;water analysis
数据来源: Taylor
摘要:
An analytical method for indirect trace determination of ethylenediaminetetraacetic acid (EDTA) in water, by potentiometric stripping analysis is described. Excess Bi(III) was added to form a 1:1 complex with EDTA at pH 2.3. The uncomplexed Bi(III) was then deposited on a glassy carbon electrode at a potential of −0.40 V vs. SCE and subsequently stripped potentiometrically using potassium dichromate as oxidant. The stripping time of uncomplexed Bi(III) was recorded. The Concentration of EDTA in the sample was determined from the concentration of added Bi(III) and the potentiometrically stripped Bi(III) at −0.4 V by the standard addition method. The relative standard deviation for EDTA concentration of 95 ppb and 4.5 ppb was 1.9% and 2.6%, respectively. The detection limit was about 1 ppb EDTA for a deposition time of 3 minutes.
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