メチルキシレノールブルーによる水銀(II)の比色定量

概要

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Mercury(II) formed a blue complex with Methylxylenol Blue (MXB) in an aqueous solution. The absorption maximum of the complex was at 615 mμ, and the absorbance was nearly constant over the pH range from 6.7 to 7.0. The calibration curve followed Beers law over the range from 6 to 60 μg of mercury(II) in 25 ml solution. Variation coefficient for 50 μg of mercury(II) was 1.4%. The recommended analytical procedure was as follows : fifteen milliters of the sample solution containing 6 to 60 μg mercury(II) was mixed with 1.0 ml of hexamethylenetetramine-HNO3 buffer and 1.0 ml of 0.1% MXB solution, and made up to 25ml with water (the final pH 6.8). After 5 minutes, the absorbance at 610 mμ was measured against the reagent blank. Many metal ions interfered. Good results were obtained for the analysis of tap water added with known amounts of mercury(II).