Determination of Trace Nitrobenzene in Water by Leach-Spectrophotometry / 环境与健康杂志

Objective To develop a rapid method for the determination of trace nitrobenzene in water. Methods In the acidic medium, the separation and enrichment of trace nitrobenzene in water by the technique of extraction-back extraction was done. With catalyst copper salt, nitrobenzene can be reduced into aniline and through the diazotization with hydrochloride naphthyl ethylenediamine, then form a stable purple complex which can be determined by spectrophotometry. Results The maximum absorption of the complex was at 540 nm and the molar absorptivity was ?540=2.6?104 L/(mol?cm). Beer’s law was obeyed in the range of 0.5～40 ?g/25 ml. The rates of recovery were 104.1%～109.1% and the lowest detectable concentration was 0.002 mg/L, RSDs