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PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COBALT BY THE REACTION SYSTEM OF Co(II)-AUZARIN RED-RHODAMINE B-PVA

Wang Ting-jian

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Abstract

In an ammoniacal buffer medium of pH 10, Co(Ⅱ) was reacted with alizarin red and rhodamine B to form a ternary complex, which was remarkably sensitized and stabilized by the addition of PVA. The absorption maxima was found at 556nm. Beer′s law was held over the range of 0～7.5μg of Co(Ⅱ) per 50ml of solution, with a molar absorptivity of 3.28×10 5L·mol -1·cm -1. RSD at the level of 2μg of Co(Ⅱ) was found to be 2.66% (n=6). This method has been applied satisfactorily to the determination of trace amounts of cobalt in water.

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In an ammoniacal buffer medium of pH 10, Co(Ⅱ) was reacted with alizarin red and rhodamine B to form a ternary complex, which was remarkably sensitized and stabilized by the addition of PVA. The absorption maxima was found at 556nm. Beer′s law was held over the range of 0～7.5μg of Co(Ⅱ) per 50ml of solution, with a molar absorptivity of 3.28×10 5L·mol -1·cm -1. RSD at the level of 2μg of Co(Ⅱ) was found to be 2.66% (n=6). This method has been applied satisfactorily to the determination of trace amounts of cobalt in water.

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Available abstract

In an ammoniacal buffer medium of pH 10, Co(Ⅱ) was reacted with alizarin red and rhodamine B to form a ternary complex, which was remarkably sensitized and stabilized by the addition of PVA. The absorption maxima was found at 556nm. Beer′s law was held over the range of 0～7.5μg of Co(Ⅱ) per 50ml of solution, with a molar absorptivity of 3.28×10 5L·mol -1·cm -1. RSD at the level of 2μg of Co(Ⅱ) was found to be 2.66% (n=6). This method has been applied satisfactorily to the determination of trace amounts of cobalt in water.

Key concepts: Molar absorptivity, Cobalt, Rhodamine B, Chemistry, Trace Amounts, ALIZARIN RED, Rhodamine, Spectrophotometry

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PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COBALT BY THE REACTION SYSTEM OF Co(II)-AUZARIN RED-RHODAMINE B-PVA — Research Paper | ScholarLens