Abstract
Manganese can be determined by colorimetry with previous oxidation of Mn(II) in a strong basic medium, using 3,3′,5,5′-tetramethylbenzidine as a chromogenic reagent. The molar absorptivity of the reaction product is 3.4 × 104 mol−1l cm−1l, the detection limit 3 ng/ml, the RSD (0.5 mg/l,n = 8) 0.9% and the calibration range (1-cm cells) 0.02–0.8 mg/1 V(V), Cr(VI) and Co(II) are the most significant interferences. The new method was compared with an AAS procedure (air-acetylene flame) with previous solvent extraction and also with a colorimetric method for the determination of manganese in sea and drinking water.
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Serrat, F.B. 3,3′,5,5′-Tetramethylbenzidme for the colorimetric determination of manganese in water. Mikrochim Acta 129, 77–80 (1998). https://doi.org/10.1007/BF01246852
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DOI: https://doi.org/10.1007/BF01246852