水中一氯胺和二氯胺的紫外连续流动测定

CONTINUOUS FLOW DETERMINATION OF MONO- AND DI-CHLORAMINE IN AQUATIC PHASE

本文研究了二氯胺与溴化钾的反应及其产物,采用微孔渗透膜分离-紫外分光测定系统,测定水溶液中的一氯胺与二氯胺。本法的线性范围为2×10^(-5)mol·l^(-1)—1×10^(-2)mol·l^(-1),标准偏差在2×10^(-4)mol·l^(-1)时为4.3％。

Monochloramine and dichloramine both are such compounds, which were always produced from water and/or wastewater treatment by chlorination. They cannot be directly determined by traditional UV spectrometric method, since of dichloramine influences determination of monochloramine at 243nm. Dichloramine selectively reacts with KBr at pH 5. The reacting products become ionic compounds, when its hydrolyses at pH 11. The reaction of dichloramine with KBr and reacting products was investigated in this paper. Quickly and simply directly determination of monochloramine and dichloramine in aquatic phase can be achieved by microporous permeation tube separator and UV spectrometric detection system. By this method, the linear range are from 2×10-5mol·l-1 to 1×10-2mol·l-1, the standard variation are 4. 3% and 1. 8% at 2×10-4mol·l-1 and 1×10-3mol·l-1 respectively.