Determination of cyanide, sulfide, iodide, and bromide by ion chromatography with electrochemical detection

Rocklin, Roy D.; Johnson, Erika Katherine

doi:10.1021/ac00252a005

Cited by 215 publications

(59 citation statements)

References 17 publications

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“…Therefore, developing a rapid and sensitive method for monitoring sulfide ions is highly important to ensure human health safety. Great progress has been made regarding sulfide ions detect devices in the past several years, such as chromatography [21], titration [22], extraction [23], fluorimetry [24], spectrophotometry [25], and an electrochemical method [26]. Considering practicality and convenience, fluorimetry method is acceptable.…”

Section: Introductionmentioning

confidence: 99%

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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A fluorescent probe for the sensitive and selective determination of sulfide ions is presented. It is based on the use of graphene quantum dots (GQDs) which emit strong and stable blue fluorescence even at high ionic strength. Copper(II) ions cause aggregation of the GQDs and thereby quench fluorescence. The GQDs-Cu(II) aggregates can be dissociated by adding sulfide ions, and this results in fluorescence turn on. The change of fluorescence intensity is proportional to the concentration of sulfide ions. Under optimal conditions, the increase in fluorescence intensity on addition of sulfide ions is linearly related (r 2 =0.9943) to the concentration of sulfide ions in the range from 0.20 to 20 μM, and the limit of detection is 0.10 μM (at 3 σ/s). The fluorescent probe is highly selective for sulfide ions over some potentially interfering ions. The method was successfully applied to the determination of sulfide ions in real water samples and gave recoveries between 103.0 and 113.0 %.

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Section: Introductionmentioning

confidence: 99%

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Peng

Xiong

et al. 2015

Microchim Acta

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“…In order to reach low enough detection limits, the preconcentration of the analyte in the form of insoluble salts such as HgI/Hg 2 I 2 or AgI was exploited for developing cathodic stripping methods [12][13][14][15][16][17]. In particular, silver electrodes were applied both for cathodic stripping analyses [18][19][20] and as electrochemical detector for iodide determinations by ion-chromatography [11,21,22]. More recently, methods based on adsorptive accumulation [23], ion-pairing [24], ion-exchange at electrodes coated with clays [25] and polylysine [26], have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoelectrode ensembles for direct trace electroanalysis of iodide

Pereira

Moretto

Leo

et al. 2006

Analytica Chimica Acta

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A procedure for the standardization of ensembles of gold nanodisk electrodes (NEE) of 30 nm diameter is presented, which is based on the analytical comparison between experimental cyclic voltammograms (CV) obtained at the NEEs in diluted solutions of redox probes and CV patterns obtained by digital simulation. Possible origins of defects sometimes found in NEEs are discussed. Selected NEEs are then employed for the study of the electrochemical oxidation of iodide in acidic solutions. CV patterns display typical quasi-reversible behavior which involves associated chemical reactions between adsorbed and solution species. The main CV characteristics at the NEE compare with those observed at millimeter sized gold disk electrodes (Au-macro), apart a slight shift in E 1/2 values and slightly higher peak to peak separation at the NEE. The detection limit (DL) at NEEs is 0.3 M, which is more than one order of magnitude lower than DL at the Au-macro (4 M). The mechanism of the electrochemical oxidation of iodide at NEEs is discussed. Finally, NEEs are applied to the direct determination of iodide at micromolar concentration levels in real samples, namely in some ophthalmic drugs and iodized table salt.

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“…Potenciometricamente, vários analitos foram quantificados, dentre os quais, haletos [11][12][13][14] , cianeto 15 , vitamina C e glutationa 16 . Amperometricamente, cianeto, sulfeto, iodeto, brometo e formaldeído foram analisados por diferentes autores [17][18][19] . Por voltametria, sulfato 20 , zinco 21 , nitrato 22 e DNA 23 também foram quantificados utilizando eletrodos de prata.…”

Section: Introductionunclassified

Aplicações eletroanalíticas com eletrodos de prata confeccionados a partir de CDs graváveis

Richter¹,

Jesus²,

Neves³

et al. 2003

Quím. Nova

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. Prof. Lineu Prestes, 748, 05508-900 São Paulo -SP Recebido em 13/12/02; aceito em 29/4/03 ELECTROANALYTICAL APPLICATIONS OF SILVER ELECTRODES BUILT FROM RECORDABLE CDs. This paper presents a new way for the construction of silver electrodes utilizing recordable CDs. The new electrodes were explored for the quantification of chloride (by potentiometry/FIA), cyanide (by amperometry/FIA) and for lead analysis (by square wave voltammetry). For the flowing measurements, a digital multimeter, connected to a microcomputer (via RS 232 interface) was used to collect directly the potential signal (for Cl -measurements) or to take the output signal from a potentiostat (for CN -measurements). The square wave voltammetry analysis was performed in a commercial instrument. The results shown good performance of the new electrodes and the detection limit (s/n = 3) attained for these three analytes were: 0. INTRODUÇÃODurante muitos anos, mercúrio se constituiu no material mais empregado como eletrodo em aplicações eletroanalíticas. No entanto, a alta toxicidade deste metal e a estreita faixa de trabalho na região anódica fizeram com que os eletrodos sólidos passassem a ganhar crescente importância. Dentre os eletrodos sólidos, receberam mais atenção os eletrodos de carbono (vítreo, pirolítico e de pasta), ouro, platina e prata. Além destes, em menor escala, também são utilizados eletrodos de cobre, níquel, alumínio, antimônio, paládio, molibdênio, entre outros 1 . Uma das principais vantagens do eletrodo de mercúrio é a possibilidade da sua renovação através da troca da gota, principalmente em meios onde ocorre o envenenamento do eletrodo. Eletrodos sólidos não apresentam esta vantagem e para a renovação de sua superfície diferentes procedimentos de limpeza são descritos 2-4 . Uma condição intermediária pode ser alcançada com eletrodos descartáveis. Trata-se de dispositivo de baixo custo, de construção simples e rápida, que pode ser descartado sempre que apresentar algum problema e substituído por outro. Os eletrodos impressos constituem-se em exemplo bastante popular de eletrodos descartáveis 5 . Recentemente foi descrito um processo de construção de eletrodos de ouro de baixo custo, que permite descartar o sensor sempre que for necessário 6 . Tais eletrodos foram construídos a partir de discos compactos graváveis (CD-Rs). Devido à simplicidade de construção e ao baixo custo dos CD-Rs, estes eletrodos podem ser utilizados e, posteriormente, descartados em casos de envenenamento, formação de óxidos sobre sua superfície ou ainda algum outro problema.CD-Rs possuem em sua constituição uma película metálica de ouro ou prata. Os eletrodos de ouro já foram explorados em nosso grupo para a quantificação de traços de metais pesados 7,8 e para a análise de fármacos 9,10 . A construção de eletrodos de prata a partir de CD-Rs também é de grande relevância. Eletrodos de prata convencionais são muito utilizados para medidas potenciométricas e sua aplicação em análises amperométricas e voltamétricas tem recebido crescente atenção. Potenciom...

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Determination of cyanide, sulfide, iodide, and bromide by ion chromatography with electrochemical detection

Cited by 215 publications

References 17 publications

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

Gold nanoelectrode ensembles for direct trace electroanalysis of iodide

Aplicações eletroanalíticas com eletrodos de prata confeccionados a partir de CDs graváveis

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