Sequential determination of arsenite and arsenate by ion chromatography

Li, Zongli; Mou, Shaoshuai; Zhang, Ni; Riviello, John

doi:10.1016/0003-2670(95)00030-4

Cited by 34 publications

(27 citation statements)

References 24 publications

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“…This gas can be de com po sed to give ele men tal ar se nic for atomic ab sorp ti on spec tro metry or un der go a co lo ri me tric reac ti on. In dif fe ren ti a ti on stu di es, va ri ous chro ma to grap hic tech ni ques have been used, which are of ten cou pled with ele ment-specific de tec ti on met hods (grap hi te fur na ce ato -mic ab sorp ti on spec tro metry or in duc ti vely cou pled plasma ato mic emis si on spec tro metry) [6][7][8][9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Selective reduction of arsenic species by hydride generation: atomic absorption spectrometry part 1 - reduction media

Quináia¹,

Rollemberg²

1997

J. Braz. Chem. Soc.

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A de ter mi na ção se le ti va de As(III), As(V) e áci do di me ti lar sí ni co (DMA) foi es tu da da pela téc ni ca da ge ra ção de hi dre tos -es pec tro me tria de ab sor ção atô mi ca. Os me i os de re du ção se leci o na dos per mi ti ram a de ter mi na ção de As(III) na pre sen ça de tam pão ci tra to (0,4 mol /L, pH4,4), As(III) + As(V) no meio HCl 6 mol/L, após uma pré-redução com io de to de po tás sio, e As(III) + DMA em CH 3 COOH 0,12 mol/L. O teor de ar sê nio to tal pode ser de ter mi na do no meio HCl 6 mol/L, após ser efe tu a da a pré-redução das for mas As(V) e DMA com io de to de po tás sio e clo re to es ta no so. Os efe i tos de in ter fe rên cia ca u sa dos por di fe ren tes íons me tá li cos fo ram, tam bém, ava li a dos.Hydri de ge ne ra ti on -ato mic ab sorp ti on spec tro metry, using so di um te trahy dro bo ra t e(III) as a re duc tant, was used to form ar si nes se lec ti vely from inor ga nic ar se nic(III) and ar se nic(V), and di meth ylar si nic acid (DMA). The se lec ted re ac ti on me dia al lo wed the ra pid de ter m i na ti on of ar se nic(III) alo ne (ci tra te buf fer 0.4 mol/L, pH 4.4), ar se nic(III) + ar se nic(V) (HCl 6 mol/L, af ter pre-reduction with po tas si um io di de) and ar se nic(III) + DMA (ace tic acid 0.12 mol/L) . To tal ar se nic could be me a su red in HCl 6 mol/L, af ter ar se nic(V) and DMA pre-reduction wit h a po tas si um io di de and stan nous chlo ri de mix tu re. Inter fe ren ce ef fects pro du ced by he avy metal ions were also eva lu a ted.Key words: ar se nic spe ci a ti on, hydri de ge ne ra ti on, se lec ti ve re duc ti on, ato mic ab sorp ti o n spec tro metry Intro duc ti onThe en vi ron men tal che mistry of ar se nic is com pli cated by the wi dely dif fe ring pro per ti es of na tu rally ocurring and ant hro po ge nic ar se nic com pounds. Arse nic can be pre sent in na tu re ma inly as inor ga nic spe ci es, ar se ni te and ar se na te, and as meth yla ted spe ci es, in clu ding methylar so na te and di meth ylar si na te. The most wi dely ob served bi o che mi cal fate of ar se nic in the en vi ron ment is meth yla ti on 1,2 . Even whe re meth yla ted ar se nic compounds have not been used agri cul tu rally, inor ga nic ar senic can be con ver ted into meth yla ted forms in the en vi ron ment; the se or ga no ar se nic com pounds are re le ased into the aque ous en vi ron ment, the reby be co ming avai la ble to hig her le vels of the food cha in 3,4 .The bi o a va i la bi lity and the physi o lo gi cal / to xi co lo gical ef fects of ar se nic de pend on its che mi cal form 5 and, thereby, kno wing the ar se nic spe ci a ti on and trans for ma ti ons in the en vi ron ment be co mes very im por tant, ne e ding ac cura te met hods for se pa ra ti on and de ter mi na ti on of ar se nic spe ci es.Nu me rous analy ti cal tech ni ques have been ap pli ed to ar se nic de ter mi na ti on in en vi ron men tal sam ples; the most wi dely ac cep ted pro ce du re for to tal ar se nic analy sis uses the re duc ti on of ar se nic com pounds to ga se...

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Section: Introductionmentioning

confidence: 99%

Selective reduction of arsenic species by hydride generation: atomic absorption spectrometry part 1 - reduction media

Quináia¹,

Rollemberg²

1997

J. Braz. Chem. Soc.

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“…We used ascorbic acid in our experiment, which is most economic. Addition of antimony or bismuth in the ion association has been reported to improve sensitivity [20,21]. In our preliminary studies we found that bismuth gives a better absorbance signal than antimony.…”

Section: Color Reactionmentioning

confidence: 84%

Determination of trace amounts of phosphate by flow-injection photometry

Karthikeyan

Hashigaya

Kajiya

et al. 2004

Analytical and Bioanalytical Chemistry

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This paper describes a simple and rapid procedure for determination of traces of phosphate by means of molybdenum blue chemistry. The use of a cost-effective home-made flow cell with a long path length in combination with a light emitting diode (LED) and a photodiode (PD) is demonstrated as a simple absorbance detector for flow-injection analysis. In this method, a sample is injected into the carrier stream through an injection valve and mixed online with mixed reagent (a mixture of molybdate, bismuth, and ascorbic acid in sulfuric acid). The color intensity of the resulting association complex, molybdenum blue, is measured photometrically ( lambda(max) 875 nm). The proposed method can be used to detect phosphate in the range 0.02-4.0 mg x L(-1) and the precision of the proposed procedure is less than 5% at 0.1 mg x L(-1) phosphorus as phosphate. The method has been successfully applied to a variety of natural water samples.

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“…Li et al [160] analyzed As(III) and As(V) in water by anion exchange chromatography with amperometric and UV detection. It is interesting how the different amperometric response of the two oxidation states complicates the effective possibility of speciating them.…”

Section: Voltammetry Coupled With Nonelectroanalytical Techniquesmentioning

confidence: 99%

Analysis and Speciation of Traces of Arsenic in Environmental, Food and Industrial Samples by Voltammetry: a Review

Cavicchioli¹,

La-Scalea

Gutz³

2004

Electroanalysis

103

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Voltammetric approaches for the determination of arsenic and speciation at trace levels are critically appraised in a review covering the literature from 1970 to 2002. Special attention is devoted to stripping modes and to issues related to the choice of working material and supporting electrolyte. A section is dedicated to the management of real samples and aspects of sample preparation. An extensive compilation, organized by real sample type, gathers essential experimental conditions. Potentiometric stripping analysis is introduced for sake of comparison. The coupling of voltammetric detection or preaccumulation with FIA, chromatography, capillary electrophoresis and ICP techniques is also addressed.

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Sequential determination of arsenite and arsenate by ion chromatography

Cited by 34 publications

References 24 publications

Selective reduction of arsenic species by hydride generation: atomic absorption spectrometry part 1 - reduction media

Selective reduction of arsenic species by hydride generation: atomic absorption spectrometry part 1 - reduction media

Determination of trace amounts of phosphate by flow-injection photometry

Analysis and Speciation of Traces of Arsenic in Environmental, Food and Industrial Samples by Voltammetry: a Review

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