Effect of pH on chromium(VI) species in solution

Tandon, R.K.; Crisp, P.T.; Ellis, J.; Baker, R.S.U.

doi:10.1016/0039-9140(84)80059-4

Cited by 157 publications

(86 citation statements)

References 4 publications

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“…In every case, the potential was constant in pH range from 3.0 to 7.0. Below pH 1.5, a decrease of the potential was observed, which could be explained by the protonation of the HCrO 4 -anion 30 forming H 2 CrO 4 , which is leached off from the electrode membrane. For solutions with pH over 7.0, a decrease of the potential was also observed.…”

Section: 29mentioning

confidence: 99%

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Silsesquioxane 3-n-Propylpyridinium chloride: a new polymer for the potentiometric analysis of Cr(VI) in electroplating and leather industry wastes

Muxel¹,

Jesus²,

Alfaya³

et al. 2007

J. Braz. Chem. Soc.

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Um novo polímero, cloreto de 3-n-propilpiridínio-silsesquioxano (SiPy + Cl -), foi utilizado na preparação de um eletrodo. Este eletrodo íon seletivo, formado de um bastão de grafite recoberto pelo polímero, foi construído e avaliado pela determinação de Cr(VI) em amostras de águas residuárias de indústrias de galvanoplastia e de couro. O eletrodo exibiu uma resposta Nernstiana para Cr(VI) entre as concentrações 3,1×10-6 e 1,8×10 -2 mol L -1 e limite de detecção de 2,8×10-6 mol L -1 (0,15 ppm). A resposta do eletrodo para Cr(VI) foi rápida (15 s) e o potencial independente do pH na faixa de 3,0 a 7,0. Os coeficientes de seletividade para diversos ânions mostram que o eletrodo apresenta um excelente desempenho. O sensor exibe um tempo de vida útil de 6 meses com boa reprodutibilidade. A determinação de Cr(VI) em águas residuárias de indústrias de galvanoplastia e de couro usando o sensor foi realizada com sucesso.A new polymer, silsesquioxane 3-n-propylpyridinium chloride (SiPy + Cl -), was used in the preparation of an electrode. The polymer coated graphite rod ion selective electrode for Cr(VI) was constructed and evaluated for the determination of Cr(VI) in samples of electroplating and leather industry wastes. This electrode exhibited a Nernstian response for Cr(VI) concentrations between 3.1×10 -6 and 1.8×10 -2 mol L -1 and a detection limit of 2.8×10 -6 mol L -1 (0.15 ppm). The response of the electrode for Cr(VI) was fast (15 s) and the independent potential of pH in the range of 3.0 to 7.0. The selectivity coefficients for several anions showed that the electrode presents excellent performance. The sensor exhibits a shelf-life of 6 months with good reproducibility. Determination of Cr(VI) in electroplating and leather wastes using the sensor was successfully achieved.

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Section: 29mentioning

confidence: 99%

“…The following equations describe the distribution of chromium species in aqueous solution. 30 Figure 3. In every case, the potential was constant in pH range from 3.0 to 7.0.…”

Section: 29mentioning

confidence: 99%

Silsesquioxane 3-n-Propylpyridinium chloride: a new polymer for the potentiometric analysis of Cr(VI) in electroplating and leather industry wastes

Muxel¹,

Jesus²,

Alfaya³

et al. 2007

J. Braz. Chem. Soc.

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“…All Cr(VI) species are soluble oxides, used to detect a limited number of valences of select metals and the three main Cr(VI) species in solution are highly (e.g., Cr(III) and Cr(VI)). Such methods include: flame soluble chromate (CrO4), hydrochromate (HCr04) and (F)-and electrothermal (ET)-atomic adsorption spectrodichromate (Cr 2 072-) anions [29,30]. Hexavalent (as well as metry (AAS); direct current plasma (DCP)-and inductively pentavalent) Cr species are strong oxidants which act as coupled plasma (ICP)-atomic emission spectrometry (AES); carcinogens, mutagens and teratogens in biological systems inductively coupled plasma mass spectroscopy (ICP-MS); (for reviews, see Refs.…”

Section: Introductionmentioning

confidence: 99%

Determination of chromium valence over the range Cr(0)–Cr(VI) by electron energy loss spectroscopy

2006

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“…Verificou-se que a máxima adsorção ocorre em pH 2, onde a quantidade adsorvida é de 200 mmol g -1 . Em soluções aquosas de íons Cr(VI), entre pH 1 a 8, observa-se uma mistura de espécies 11 4 2-(5)…”

Section: Isotermas De Adsorçãounclassified

Filme fino de ZrO2 enxertado sobre a superfície de sílica gel: preparação e propriedade de adsorção de Cr(VI)

Lazarin¹,

Borgo²,

Gushikem³

2002

Quím. Nova

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Effect of pH on chromium(VI) species in solution

Cited by 157 publications

References 4 publications

Silsesquioxane 3-n-Propylpyridinium chloride: a new polymer for the potentiometric analysis of Cr(VI) in electroplating and leather industry wastes

Silsesquioxane 3-n-Propylpyridinium chloride: a new polymer for the potentiometric analysis of Cr(VI) in electroplating and leather industry wastes

Determination of chromium valence over the range Cr(0)–Cr(VI) by electron energy loss spectroscopy

Filme fino de ZrO2 enxertado sobre a superfície de sílica gel: preparação e propriedade de adsorção de Cr(VI)

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