Synthesis of 2-hydroxy-4-sulfamylbenzen-3-(4-Nitrophenyl)-Triazene and Its Colour Reaction with Mercury

The 2-hydroxy-4-sulfamylbenzen -3-(4-Nitrophenyl )- Triazene(HSNPT) has been synthesized. The color reaction of HSNPT with mercury i s investigated. In the presence of the surface active agent Triton X-100 and in a Na_2B_4O_7-NaOH medium of pH=10.0-11.0, HSNPT with Hg(Ⅱ) for ms a yellow complex. The molar absorptivity of the complex is e=1.21×10~5Lom olocm-1 at the determination wavelength of 535 nm with the molar ratio of Hg(Ⅱ) to HSNPT being 1∶2. The Beer′s law is well obeyed in the range of 0-12μg /mL for nickel at the determination wavelength. r=0.9994. This method has been ap plied to determine the mercury in waste water with satisfactory results. RSD3%( n=5) .The recovery of Hg is in the range 98.2%-102.5%.