Comparative Study of Leuco Dyes as Reagents for Spectrophotometric Determination of Arsenic (III)

In this paper spectrophotometric determination arsenic (III) is described. The method is based on the two step reaction. First step is arsenic (Ⅲ) and iodate reaction in the acid medium of pH=1.1. In this step, iodine is liberated proportionally according to the amounts of arsenic (Ⅲ). Next step is the reaction of liberated iodine with leuco dyes in pH= 4-5. In this work, the leuco dyes was comparatively studied. The employed leuco dyes are malachite green (LMG), leuco crystal violet (LCV) and leuco berberin blue Ⅰ (LBB). The oxidized leuco dyes was determined by spectrophotometry. Beer’s law is obeyed in the range of 0.1-0.1μg mL -1 as arsenic. The molar coefficient for arsenic (Ⅲ) was around 4×10 4 l mol -1 cm -1 with each leuco dyes. In these leuco dyes, LBB was suitable as reagent because not influenced temperature, concentration of iodate and LBB, and rapid reaction time.

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