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Speciation and Analysis of arsenic(III) and arsenic(V) by Electrochemical Hydride Generation Spectrophotometric Method

Speciation and Analysis of arsenic(III) and arsenic(V) by Electrochemical Hydride Generation Spectrophotometric Method

Mohammad Hossein Arbab-Zavar, Mahmoud Chamsaz, Tahereh Heidari

Anal Sci. 2010 Jan;26(1):107-10.

PMID: 20065596

Abstract:

A simple method was developed for speciation and spectrophotometric determination of inorganic As(III) and As(V) using an electrochemical hydride generation technique. For speciation of As(III) and As(V), a graphite rod was used as cathode to reduce As(III) to AsH(3), the rod was then replaced with a tin-lead alloy wire for reducing As(V) to AsH(3). The spectrophotometric determination was based on the reaction of AsH(3) with silver diethyldithiocarbamate to give an absorbing complex at 510 nm. Under the optimized conditions, the calibration curves were linear over the ranges of 0.1-5 microg ml(-1) for As(III) and 0.5-4.0 microg ml(-1) for As(V). The concentration detection limits of 0.02 and 0.06 microg ml(-1) were achieved for As(III) and As(V), respectively. The relative standard deviations for five replicate speciation and determination of 3.0 microg ml(-1) As(III) and As(V) were 0.8 and 7.2%, respectively. The accuracy and recovery of the method were evaluated by analyzing tap water spiked with As(III) and As(V).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1470617	Silver diethyldithiocarbamate		1470-61-7	Price

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