Synthesis of 1-(4-Antipyrine)-3-(3-Nitroaniline)-Triazene and Its Color Reaction with Mercury(II)

摘要

The synthesis of a new triazene reagent 1-(4-antipyrine)-3-(3-nitroaniline)-triazene (ANTA) and its color reaction with Hg (II) was studied and a new spectrophotometric method for the determination of Hg (II) was established. The results showed that in the presence of micromulsion Tween-80, ASTA could reacted with Hg(II) to form a red stable complex of which the molar ratio of reagent︰metal was 2:1 in Na_2B_4O_7-NaOH medium. The maximum absorption peak of the complex was located at 495 nm with the apparent molar absorption of 3.8 ×10~5L·mol~(-1)·cm~(-1). Beer's law was obeyed in the range of 0.32～10 μg/10 mL for Hg(II) and the detection limit was 0.10 mg/L. Many ions did not interfere the colour reaction system due to the existence of ammonia. This method was applied to determination of Hg(II) in lead-zinc ore samples, and the results were in accordance with those obtained by AAS method. Recovery was in the range of 103.0～103.2% and the RSD(n=6) was not more than 4.6%.