The spectrophotometric determination of trace molybdenum (VI) after collection and elution as molybdate ion on protonated chitin

Hoshi, Suwaru; Konuma, Kiyotaka; Sugawara, Kazuharu; Uto, Masayuki; Akatsuka, Kunihiko

doi:10.1016/s0039-9140(97)00051-9

Cited by 43 publications

(15 citation statements)

References 27 publications

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“…10) Hence all the absorbance measurements in the current study are carried out with UV-spectrophotometer at 540 nm light wavelength using distilled water as reference. This procedure was followed by adopting the method given in industrial standard for Cr(VI) analysis.…”

Section: Cr(vi) Estimationmentioning

confidence: 99%

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

Kapure

Rao

2008

ISIJ Int.

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Hexavalent chromium, Cr(VI) presence in chromite concentrate is a concern due to its environmental unfriendly and carcinogenic nature. Chromite concentrates typically contain Cr(VI) in the range of 2.0 to 4.0 mg-Cr/kg. The conventional methods of removing toxic Cr(VI) which includes the use of inorganic reductants are generally not preferred industrially due to their unavoidable environment unfriendly and cost ineffective nature. Therefore, in this study the use of Terminalia chebula, which is a naturally occurring organic product, is explored for Cr(VI) removal in chromite concentrates. The parameters in critical Cr(VI) removal process such as Terminalia chebula dosages, contact time and water requirements for application of this method are estimated and used at plant scale. It was found that 540 g of Terminalia chebula and contact time of 120 s is required for one ton concentrate treatment at plant for minimizing Cr(VI) to trace levels of 0.02 mg-Cr/kg. It was also observed that the water requirements in using Terminalia chebula method are insignificant. The application of Terminalia chebula for removing Cr(VI) in chromite concentrate is found to be suitable method for using in continuous production process of chromite concentrates at plant.

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Section: Cr(vi) Estimationmentioning

confidence: 99%

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

Kapure

Rao

2008

ISIJ Int.

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“…Modern spectrophotometry is most commonly used for analysis of molybdenum, especially in developing countries. In the literature, reagents for spectrophotometric determination of molybdenum have 3,3 0 ,5,5 0 -tetramethylbezidine (Di and Tu, 2001), bromopyrogallol red (Hoshi et al, 1997), alizarin Red S (Alkan et al, 2003), phenylfluorone (Nakatsuka et al, 1995), thiocyanate (de Andrade et al, 1998;Tunceli and Turker, 2004), 1,2-dihydroxybenzene-3,5-disulfate (Lis and But, 2000) and thiazolylazo compounds (Amin, 1999). Although each chromogenic system has its advantages and disadvantages with respect to sensitivity, selectivity, water solubility and rapidity due to different reagents, most of them require a previous separation or pre-concentration procedure to increase the sensitivity or selectivity.…”

Section: Introductionmentioning

confidence: 99%

9-(2,4-dihydroxyphenyl)-2,3,7-trihydroxyl-6-fluorone as analytical reagent for spectrophotometric determination of molybdenum in plant tissues

Yang

Pan

2005

Journal of Food Composition and Analysis

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“…[7][8][9][10] On the other hand, the spectrophotometric determination of Mo VI is often accompanied by the interference of W due to their similar chemical characters. [11][12][13][14] Although this problem is circumvented by means of various chemical methods or spectrophotometric techniques, such as chemical masking, 15 a mixed micellar medium, 16 multiwavelengths, 17 extraction, 18 derivative, 19 calculation method, 20 these methods are, comparatively speaking, partly improved, complicated or/and time-consuming. The present paper describes an extremely selective and simple method for the spectrophotometric determination of Mo VI in the presence of a large amount of W VI .…”

Section: Introductionmentioning

confidence: 99%

Novel Spectrophotometric Method for the Determination of Molybdenum in a PVA Medium

Di¹,

Wu²,

Tu³

et al. 2002

ANAL. SCI.

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The spectrophotometric determination of trace molybdenum (VI) after collection and elution as molybdate ion on protonated chitin

Cited by 43 publications

References 27 publications

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

9-(2,4-dihydroxyphenyl)-2,3,7-trihydroxyl-6-fluorone as analytical reagent for spectrophotometric determination of molybdenum in plant tissues

Novel Spectrophotometric Method for the Determination of Molybdenum in a PVA Medium

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