基于连续光谱同步检测水中酚与阴离子表面活性剂

Simultaneous Detection of Phenol and Anionic Surfactant in Water Based on Continuous Spectrum

水中酚与阴离子表面活性剂均为水质检测的重要指标,在改进优化两者标准检测方法(分光光度法)的基础上,将两者显色-萃取剂整合为一复合显色-萃取剂,并采用基于后分光设计实时测量连续光谱(340～770nm)的微型光谱仪,构建了一个既无化学干扰也无光谱干扰的复合检测体系,实现了水中两者的同步快速检测,大幅减少了试剂用量及检测时间。本法对酚和阴离子表面活性剂的检出限分别为0.003和0.016mg.L-1;与标准方法对比测试实际水样,结果表明本法的重现性(相对标准偏差,n=5)、准确性(相对标准方法结果的偏差)均小于5%,满足相关标准要求,可广泛应用于水环境与污水处理等的现场水质监测。

Phenol and anionic surfactant are important indices for water-quality.Based on improvement and optimization of standard methods（spectrophotometry） for the two indices,we integrated the respective two color-extractants into a composited reagent.Using a self-developed microspectrometer with a design of splitting behind and collection of continuous spectrum signal（340~770 nm） in real time,a compound detection system was constructed.This system could simultaneously detect phenol and anionic surfactant in water without chemical and spectral interferences,leading to great decreases in reagent amount and detection time.The detection limits for phenol and anionic surfactant are 0.003 and 0.016 mg·L-1,respectively.This method was applied to water-quality monitoring of real samples in comparison with standard methods,and the results indicated that its reproducibility（relative standard deviation,n=5） and accuracy（relative error to results by standard methods） were less than 5%,contenting with the related standard.