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Triphenyltetrazolium chloride as a new analytical reagent for molybdenum(VI): Application to plant analysis

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Abstract

Solvent extraction of molybdenum(VI) ion associate with triphenyltetrazolium chloride (TTC) has been studied. TTC was proposed as reagent for the spectrophotometric determination of micro amounts of molybdenum(VI) at λmax 250 nm. The optimum conditions for extraction of molybdenum(VI) as an ionassociation complex with TTC has been determined. Beer’s law is obeyed in the range of 0.5–10 μg/mL molybdenum(VI). The molar absorptivity of the ion-pair is 1 × 106 L/mol cm. The sensitivity of the method is 9.6 × 10−5 μg/cm2. The characteristic values for the extraction equilibrium and the equilibrium in the aqueous phase are: distribution constant K D = 32.64, extraction constant K ex = 2.19 × 1010 association constant β = 6.71 × 108. The interferences of different cations, anions on molybdenum(VI) determination were also investigated. A sensitive and selective method for the determination of microquantities of molybdenum(VI) has been developed. The determination was carried out without preliminary separation of molybdenum. A novel procedure of molybdenum(VI) extraction and spectrophotometric determination in different plant samples was examined.

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  1. Agricultural University—Plovdiv Laboratory Complex, Mendeleev Str. 12, Plovdiv, 4000, Bulgaria

    D. Kostova

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  1. D. Kostova
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Kostova, D. Triphenyltetrazolium chloride as a new analytical reagent for molybdenum(VI): Application to plant analysis. J Anal Chem 66, 384–388 (2011). https://doi.org/10.1134/S1061934811040095

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  • DOI: https://doi.org/10.1134/S1061934811040095

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