水銀(II)-チオテノイルトリフルオルアセトン錯体を用いたイオウイオンの吸光光度定量法

概要

論文の詳細を見る
The color of the complex between mercury (II) and thiothenoyltrifluoroacetone (STTA) is suppressed in the presence of sulfide ion. This inhibitory effect was applied to the spectrophotometric determination of 0.3-6.45 μg of sulfide ion in 10 ml solution. The molar extinction coefficient was about 32000. The precisions in coefficient of variation were 2.3 and 1.1% for 2.15 and 4.30 μg, respectively, of sulfide ion. An analytical procedure for sulfide ion was as follows. Several milliliters of a sample solution containing 0.3-6.45 μg sulfide ion and 2 ml of borate buffer (pH 11.5) are placed in a test tube with ground glass stopper, and the solution is made up to 10 ml with water. Ten milliliters of mercury (II)-STTA complex (containing 40 μg mercury (II) per 10 ml) in carbon tetrachloride is added to it, and the mixture is shaken vigorously for 2 minutes. The absorbance of mercury (II)-STTA complex in organic phase is measured at 360 nm against carbon tetrachloride. Many kinds of anions did not interfere in this determination. Cyanide ion interfered slightly even when the amount was 1/4-fold of sulfide ion. The permissible amount of cyanide ion was slightly increased by pH 10.0 borate buffer. The proposed method was selective and sensitive, and good results were obtained for the analysis of natural water mixed with known amounts of sulfide ion.
公益社団法人日本薬学会の論文
1972-04-30