Continuous hydride generation inductively coupled plasma atomic emission spectrometry for tin: optimization of working parameters and an approach to clarifying the mechanism of stannane generation

Qiu, Deren; Vandecasteele, C.; Vermeiren, Koen A.; Dams, Richard

doi:10.1016/0584-8547(90)80120-8

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…[45][46][47] Presumiu-se que uma concentração de NaBH 4 a 3% (0,8 mol L -1 ) + NaOH 0,05 mol L -1 seria suficiente para resultar em uma relação molar recomendada. 45 Também, visando minimizar os valores do branco evitou-se trabalhar com concentrações de NaBH 4 superiores a 3% (m/v).…”

Section: Geração De Snh 4 Após Extração Em Fase Sólida Usando S Cereunclassified

Determinação seletiva de tributilestanho na presença de Sn(IV) em amostras ambientais usando HG-ICP OES e Saccharomyces cerevisiae como material sorvente

Silva¹,

Menegário²,

Franchi³

et al. 2010

Quím. Nova

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Recebido em 9/11/09; aceito em 15/3/10; publicado na web em 20/7/10 SELECTIVE DETERMINATION OF TRIBUTYLTIN IN THE PRESENCE OF Sn(IV) IN ENVIRONMENTAL SAMPLES USING HG-ICP OES AND Saccharomyces cerevisiae AS SORBING MATERIAL. A method for selective determination of tributyltin in the presence of Sn(IV) by combining hydride generation inductively coupled plasma optical emission spectrometry (HG-ICP OES) and solid phase extraction (SPE) using baker's yeast is proposed. The procedure is based on selective retention of TBT by the yeast at pH = 6. Detection limit of 1.9 µg L -1 and quantification limit of 6.3 µg L -1 were obtained. TBT and Sn(IV) were determined in the range of 0-25 µg L -1 and the proposed approach was applied to analyze river water, sea water and biological extracts, with recoveries of 114, 101 and 86%, respectively.Keywords: SPE; TBT; HG-ICP OES. INTRODUÇÃOEm água do mar, o Sn pode ocorrer nas formas inorgânicas livres nos estados de oxidação Sn(II) ou Sn(IV), ou nas formas organometálicas como o TBT (tributilestanho) ou seus produtos de degradação DBT (dibutilestanho) e MBT (monobutilestanho).1 Os compostos organometálicos de estanho são mais tóxicos que as espécies inorgânicas e a toxicidade aumenta para compostos com maior número de grupos alquilas ligados ao estanho.2 A atividade biológica e toxicidade de estanho também estão associadas ao estado de oxidação das formas inorgânicas: Sn(II) é mais tóxico que Sn(IV). 3Os compostos orgânicos de Sn entram no ambiente por meio de produtos feitos pelo homem (biocidas e estabilizantes) ou são formados a partir das espécies inorgânicas. Os compostos antropogênicos mais bem conhecidos incluem espécies de TBT, utilizadas em fórmulas de pinturas antifuligem que são responsáveis por efeitos deletérios em vários organismos marinhos, principalmente, bivalves e crustáceos. 1 Pesquisas revelam que o siri azul (Callinectes sapidus) é capaz de metabolizar efetivamente o TBT, dependendo do nível encontrado no ambiente. Porém, outras espécies, como Ilyanassa obsoleta, podem desenvolver características masculinas em fêmeas, fenômeno denominado imposexo, quando a concentração de TBT no ambiente é de aproximadamente 2 ng L -1 . 4A cromatografia gasosa (GC) é efetiva para a separação de espé-cies orgânicas de estanho e possibilita limites de detecção na faixa de ng L -1 a mg L -1 dependendo do tipo de detector utilizado. 5-8 Um dos principais inconvenientes desta técnica é o pré-tratamento tedioso da amostra, que envolve várias etapas de extração do analito, geralmente usando extrações líquido-líquido (LPE) e, posteriormente, a derivação do analito com tetraetilborato de sódio. 9A cromatografia líquida (LC) também é efetiva para o fracionamento de estanho orgânico e inorgânico, 10-14 porém, os limites de detecção são pobres quando detectores convencionais são utilizados. O limite de detecção pode ser consideravelmente melhorado quando a LC é acoplada ao ICP-MS. e diluição isotópica sub-estequiométrica. 23Bermejo-Barrera et al. 16 propuseram a determinação de TBT em águ...

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Section: Geração De Snh 4 Após Extração Em Fase Sólida Usando S Cereunclassified

Determinação seletiva de tributilestanho na presença de Sn(IV) em amostras ambientais usando HG-ICP OES e Saccharomyces cerevisiae como material sorvente

Silva¹,

Menegário²,

Franchi³

et al. 2010

Quím. Nova

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“…The generation of stannane in alkaline media was first reported by Qiu et al [129]. They mixed an acidified Sn IV solution with an alkaline solution of THB and observed stannane formation up to pH 12, the latter being measured after complete mixing of the reacting solutions.…”

Section: Alkaline Conditionsmentioning

confidence: 99%

Mechanisms of chemical generation of volatile hydrides for trace element determination (IUPAC Technical Report)

D’Ulivo

Dědina

Mester

et al. 2011

Pure and Applied Chemistry

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Aqueous-phase chemical generation of volatile hydrides (CHG) by derivatization with borane complexes is one of the most powerful and widely employed methods for determination and speciation analysis of trace and ultratrace elements (viz. Ge, Sn, Pb, As, Sb, Bi, Se, Te, Hg, Cd, and, more recently, several transition and noble metals) when coupled with atomic and mass spectrometric detection techniques. Analytical CHG is still dominated by erroneous concepts, which have been disseminated and consolidated within the analytical scientific community over the course of many years. The overall approach to CHG has thus remained completely empirical, which hinders possibilities for further development. This report is focused on the rationalization and clarification of fundamental aspects related to CHG: (i) mechanism of hydrolysis of borane complexes; (ii) mechanism of hydrogen transfer from the borane complex to the analytical substrate; (iii) mechanisms through which the different chemical reaction conditions control the CHG process; and (iv) mechanism of action of chemical additives and foreign species. Enhanced comprehension of these different mechanisms and their mutual influence can be achieved in light of the present state of knowledge. This provides the tools to explain the reactivity of a CHG system and contributes to the clarification of several controversial aspects and the elimination of erroneous concepts in CHG.

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“…A rapid growth in the Sn signal was observed up tõ 0.3 mol L -1 HCl and HNO 3 , which corresponded to the so-called critical value (CV) where the sum of THB+NaOH is stoichiometrically equal to the amount of acid and the maximum analyte signal is expected to be achieved (Qiu et al 1990). Past the CV point, at 0.26 mol L -1 (HCl, HNO 3 ), the Sn signal began to decrease systematically, reaching a nearly negligible value for HCl and HNO 3 concentrations >2.0 mol L -1 ; the effect was more pronounced for HCl.…”

Section: Effect Of Acids and Acidity Conditionmentioning

confidence: 99%

“…For the determination of tin, however, hydride generation is not an easy task since there are difficulties in evaluating the optimal experimental conditions. In light of recent studies, parameters including the reductant-acid combination (especially the type of acid and its concentration (Farías et al 2002;Feng et al 1997;Chen et al 1996;Matusiewicz and Krawczyk 2010;Qiu et al 1990) and THB concentration (Farías et al 2002;Feng et al 1997;Chen et al 1996;Matusiewicz and Krawczyk 2010)) were found to influence the efficiency of the reduction process. In most cases, it was observed that tin hydride could be effectively generated only in a low, narrow acidity range, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…0.1-0.3 mol L -1 of HCl, HNO 3 or H 2 SO 4 (Farías et al 2002;Feng et al 1997;Chen et al 1996;Matusiewicz and Krawczyk 2010;Qiu et al 1990). Moreover, strict control of the acid concentration is required because small changes near the maximum may lead to significant reductions in sensitivity (Farías et al 2002;Feng et al 1997;Chen et al 1996;Qiu et al 1990). It may be troublesome, especially for solid samples, required to be digested before detection by the aforementioned atomic spectrometry methods and where the final acid concentration is typically higher than 0.1 mol L -1…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Optimal Conditions for Determination of Low Tin Content in Fresh and Canned Tomato Samples Using Hydride Generation Inductively Coupled Plasma Optical Emission Spectrometry

Wełna

Szymczycha‐Madeja

2013

Food Anal. Methods

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We propose a procedure for the determination of tin in tomatoes after wet digestion of the samples in HNO 3 using hydride generation inductively coupled plasma optical emission spectrometry. The effect of acidity from HCl and HNO 3 (0.01-4.0 mol L -1 ) as well as the presence of Lcysteine on the efficiency of SnH 4 generation by reaction with the NaBH 4 reductant was investigated. Optimal conditions were evaluated in terms of precision, accuracy (by recovery test) and limit of detection. The best results were obtained with L-cysteine and nitric acid for sample acidificitation. Addition of 1 % (m/v) L-cysteine enhanced the Sn signal and expanded the optimal range of HNO 3 concentrations towards higher values; hence, strict control of the acidity could be avoided, up to 1.0 mol L -1 . Under the optimized conditions, a detection limit of 1.2 ng mL -1 was achieved. The applicability of the proposed method was demonstrated by the determination of low tin contents in digests of fresh and canned tomato samples with satisfactory results.

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Continuous hydride generation inductively coupled plasma atomic emission spectrometry for tin: optimization of working parameters and an approach to clarifying the mechanism of stannane generation

Cited by 21 publications

References 22 publications

Determinação seletiva de tributilestanho na presença de Sn(IV) em amostras ambientais usando HG-ICP OES e Saccharomyces cerevisiae como material sorvente

Determinação seletiva de tributilestanho na presença de Sn(IV) em amostras ambientais usando HG-ICP OES e Saccharomyces cerevisiae como material sorvente

Mechanisms of chemical generation of volatile hydrides for trace element determination (IUPAC Technical Report)

Evaluation of Optimal Conditions for Determination of Low Tin Content in Fresh and Canned Tomato Samples Using Hydride Generation Inductively Coupled Plasma Optical Emission Spectrometry

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