Indirect determination of arsenic by flotation spectrophotometry

Kunze, S.; Dietze, U.; Ackermann, Gerhard

doi:10.1007/bf01242801

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Many methods have been reported for the determination of arsenic, such as induced floatation spectrophotometry (Kunze et al 1989), coupled plasma mass spectrometry (Samanta et al 2000), flow injection analysis with hydride generation (Samanta and Chakraborti 1997), neutron activation analysis (Shull and Winefordner 1984) and fluorescence spectroscopy (Madrid et al 1995). Some of the reported chromogenic reagents used for the spectrophotometric determination of arsenic are diantipyrylmethane (Zaijun et al 2000), chlorpromazine (Min et al 1999), alizarine red S (Ahmed and Hassan 1999), methyl orange (Dianwen and Jianping 1996), malachite green (Jie and Wenbin 1985), silver diethyldithiocarbamate (Perez et al 2002), ammoniumpyrrolidinedithiocarbamate (Yuji et al 2003), antipyrylazo-4-hydroxybenzenedithiocarboxylic acid (Pastare et al 1993) and dithiodiantipyrylmethane (Jiayu et al 1993).…”

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Determination of Arsenic in Environmental and Biological Samples Using Toluidine Blue or Safranine O by Simple Spectrophotometric Method

Pasha

Narayana

2008

Bull Environ Contam Toxicol

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A simple spectrophotometric method has been developed for the determination of arsenic in various environmental and biological samples. The method is based on the reaction of arsenic(III) with potassium iodate in acid medium to liberate iodine. This liberated iodine bleaches the blue color of toluidine blue or pinkish red color of safranine O. The decrease in absorbance at 628 or 532 nm is directly proportional to arsenic(III) concentration and obeys Beer's law in the range of 1.2-10.5 or 0.4-11.5 microg mL(-1) for arsenic(III). The molar absorptivity, Sandell's sensitivity, detection limit and quantitation limit of the method using toluidine blue or safranine O were found to be 1.076 x 10(4) or 1.388 x 10(4) L mol(-1) cm(-1), 9.66 x 10(-3) or 7.49 x 10(-3) microg cm(-2), 0.308 or 0.250 microg mL(-1), 0.934 or 0.759 microg mL(-1) respectively. The relative standard deviation for five replicate analyses of 4 microg mL(-1) of As(III) using toluidine blue or safranine O were 0.60% or 0.80%. The optimum reaction conditions and other analytical conditions were evaluated. The effect of interfering ions on the determination is described. The proposed method is free from any interference. The method has been used for the determination of arsenic in various environmental and biological samples.

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confidence: 99%

Determination of Arsenic in Environmental and Biological Samples Using Toluidine Blue or Safranine O by Simple Spectrophotometric Method

Pasha

Narayana

2008

Bull Environ Contam Toxicol

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Bestimmung von Spurenelementen in Gewässern mittels Flotationsspektralphotometrie am Beispiel des Arsens

Kunze¹,

Dietze²

1991

Acta hydrochim. hydrobiol.

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Highly sensitive and selective methods for the determination of trace elements in waters and solutions are made possible by the combination of flotation and spectrophotometry (flotation spectrophotometry). The basis for it are multiply charged anion complexes of the analyte, which form sparingly soluble ion association complexes with singly charged basic dye cations in aqueous solution. Intense shaking of the aqueous solution with an organic solvent (having a low dielectric constant) results in the accumulation of these ion association complexes at the interface or on the vessel walls (flotation step). After separating the ion association complexes from the liquid phases, they are dissolved and dissociated in a polar organic solvent and the absorbance of the basic dye ions is measured as a function of the concentration of the analyte. By the example of the trace determination of arsenic in natural water, the possibilities of analytical chemistry by combination of flotation steps and spectrophotometry are demonstrated. According to the arsenic content, its determination can be performed by flotation spectrophotometry with crystal violet (detection limit 50 ng/ml As), by an indirect determination of arsenic via flotation spectrophotometry of molybdenum in the dodecamolybdoarsenic acid (detection limit 1 ng/ml As) or by the combination of collector precipitation of arsenic with zirconium hydroxide followed by froth flotation and flotation spectrophotometry as the determination technique (detection limit 0.05 ng/ml As). The reproducibilities of these variants are indicated and their accuracy is checked by comparison of methods.

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Determination of arsenate in aqueous samples by precipitation of the arsenic(V)—molybdate complex with tetraphenylphosphonium chloride and neutron activation analysis or hydride generation atomic absorption spectrometry

Elteren

Haselager

Das

et al. 1991

Analytica Chimica Acta

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Indirect determination of arsenic by flotation spectrophotometry

Cited by 4 publications

References 5 publications

Determination of Arsenic in Environmental and Biological Samples Using Toluidine Blue or Safranine O by Simple Spectrophotometric Method

Determination of Arsenic in Environmental and Biological Samples Using Toluidine Blue or Safranine O by Simple Spectrophotometric Method

Bestimmung von Spurenelementen in Gewässern mittels Flotationsspektralphotometrie am Beispiel des Arsens

Determination of arsenate in aqueous samples by precipitation of the arsenic(V)—molybdate complex with tetraphenylphosphonium chloride and neutron activation analysis or hydride generation atomic absorption spectrometry

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