Thiopyrazolone Derivatives as Analytical Reagents. XVI. : Extractionspectrophotometric Determination of Trace of Mercury by Ternary Complex formed from Mercury (II) and Thiopyrine in the Presence of Eosine

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When an aqueous solution containing mercury (II), thiopyrine and eosine was shaken with 1,2-dichloroethane at pH 10,an ion pair formed from cationic mercury (II)-thiopyrine complex and anionic eosine was extracted into the organic phase. Based on this reaction, a sensitive extraction-spectrophotometric determination method for trace of mercury was established by the absorbance measurement at 540 nm. This method is applicable to the determination of mercury less than 2.5 μg/ml. Various common cations and anions except for silver (I) and iodide did not interfere the determination practically. Molar ratio of mercury (II) to thiopyrine and eosine was found to be 1 : 2 : 1 by the continuous variation method.
公益社団法人日本薬学会の論文
1978-10-25