Interference reduction by L-cystine in the determination of arsenic by hydride generation

Boampong, Charles.; Brindle, Ian D.; Le, X. C.; Pidwerbesky, Lev.; Ponzoni, Claudio M. Ceccarelli

doi:10.1021/ac00162a018

Cited by 41 publications

(8 citation statements)

References 30 publications

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“…In HGAAS it is found that reaction matrix, type of acid, buffers and the addition of certain reagents enhances the analyte signal to a considerable extent. Such a signal enhancement in the HGAAS was first reported by Boampong et al 124 Brindle et al 125 reported the use of L-cysteine in the determination of arsenic in HG-DCP-AES as a signal enhancer. A similar effect was also reported for Sn 126 and Ge.…”

Section: Effect Of the Reaction Matrix And Thiolsmentioning

confidence: 61%

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Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

Kumar

Riyazuddin

2005

ANAL. SCI.

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The mechanism of volatile hydride generation (HG) and the formation of analyte atoms in the quartz cell atomizer used in the determination of hydride-forming elements (As, Bi, Ge, Pb, Sb, Sn, Te etc.) by atomic absorption spectrometry (AAS), have been critically reviewed. The nascent hydrogen mechanism failed to explain hydride generation under different experimental conditions when tetrahydroborate (THB), amineboreanes (AB) and cyanotrihydroborate (CBH) were used as reductants. Various experimental evidence suggested a non-nascent hydrogen mechanism, in which the transfer of hydrogen directly bonded to boron to an analyte takes place. In electrochemical hydride generation (EcHG), the reduction of the analyte species and subsequent hydrogenation was proposed. The mechanism of analyte atom formation in a quartz tube atomizer has been explained by the following hypotheses: thermal decomposition, oxidation by 02 and collisions by hydrogen free radicals. The free-radical mechanism satisfactorily explains most of the analytical implications. The significant variation in the experimental conditions required to generate different analyte hydrides makes it difficult to arrive at a generalized mechanism of hydride formation.

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Section: Effect Of the Reaction Matrix And Thiolsmentioning

confidence: 61%

“…The formation of the above type of complex was assumed because it may be generated by the reduction of the disulfide: 124…”

Section: Bh4 -+ Rsh → Rs-bh3 -+ H2mentioning

confidence: 99%

Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

Kumar

Riyazuddin

2005

ANAL. SCI.

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“…They proposed that the sulfurcontaining ligand must play a significant role in effecting rapid hydride generation, probably, by altering reaction mechanism. Brindle et al [106] and Chen et al [107] introduced the use of L-cysteine as a prereductant for As(V) and reported that it reduces the acid concentration required for hydride formation and minimizes interferences form transition metals [108]. The use of L-cysteine gained popularity as a prereductant, and many procedures have included its use for As speciation analysis.…”

Section: Speciation Analysis Based On Selective Hgmentioning

confidence: 99%

Non-chromatographic hydride generation atomic spectrometric techniques for the speciation analysis of arsenic, antimony, selenium, and tellurium in water samples—a review

Kumar

Riyazuddin

2007

International Journal of Environmental Analytical Chemistry

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“…Arsenic was determined as arsenic(iii) and l-cysteine was used as a reducing agent to convert arsenic(v) to arsenic(iii). [16][17][18][19][20] It was found experimentally that the optimum l-cysteine concentration was in the range 1.7-3.2%; a 2.5% concentration of this reagent was finally chosen.…”

Section: Optimization Of Hgaas Measurementmentioning

confidence: 99%

“…It is well known that lcysteine can also reduce interferences in the determination of arsenic(iii). [16][17][18][19][20]…”

Section: Optimization Of Hgaas Measurementmentioning

confidence: 99%

Slurry Sampling for Hydride Generation Atomic Absorption Spectrometric Determination of Arsenic in Cigarette Tobaccos

Mierzwa

Adeloju²,

Dhindsa³

1997

Analyst

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The development of a slurry sampling hydride generation atomic absorption spectrometric (HGAAS) method for the determination of arsenic in cigarette tobacco samples is described. The method is relatively simple and has been shown to give values of total arsenic close to those obtained using methods requiring total dissolution and decomposition of all vegetable matter before analysis. Pre-treatment of samples slurried in nitric acid by ultrasonication permitted the extraction of about 90% of the total arsenic from tobacco samples. Further improvement in the recovery efficiency (up to 93-94%) was accomplished by the use of an additional step of short microwave-accelerated treatment. L-Cysteine was used as a pre-reduction agent. The accuracy and precision of the slurry sampling HGAAS method were studied using the certified reference material (CRM) CTA-OTL-1 Oriental Tobacco Leaves. Under the optimum conditions, as little as 2.6 ng of arsenic can be detected. The relative standard deviation of the overall procedure was calculated to be below 7.6% at arsenic concentration levels of 0.5-0.9 mg kg-1 and the analytical results obtained for the CRM agreed with the certified value. The main factors that influenced the reliability of the method were sample homogeneity, particle size and slurry concentration.

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Interference reduction by L-cystine in the determination of arsenic by hydride generation

Cited by 41 publications

References 30 publications

Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

Mechanism of Volatile Hydride Formation and Their Atomization in Hydride Generation Atomic Absorption Spectrometry

Non-chromatographic hydride generation atomic spectrometric techniques for the speciation analysis of arsenic, antimony, selenium, and tellurium in water samples—a review

Slurry Sampling for Hydride Generation Atomic Absorption Spectrometric Determination of Arsenic in Cigarette Tobaccos

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