A rapid and accurate emergency monitoring method for sulfide in water was established in this paper.The factors affecting the accuracy such as immobilized conditions,pH value and storage time were studied.Combined with industrial characteristics,type identification,experimental analysis to determine the interfering substances and doses,and put forward the pretreatment method suitable for emergency monitoring.The characteristics of calibration curve were studied,and the ground water,surface water and industrial wastewater were measured.The results showed that the stability and storage time of the sample could be improved by adding zinc acetate and sodium acetate fixative and adjusting pH to 10-12.SO2-3 and S2 O2-3 produce positive spectral interference,copper ion and mercury ion produce negative chemical interference,and precipitation separation method is used for pretreatment.Portable gas phase molecular absorption spectrometer has high determination speed,strong anti-interference ability,and can realize automatic batch injection.The built-in curve of the instrument has good reproducibility and accuracy.The precision of different types of water samples is 1.6%-9.3%,and the standard recovery rate is 88.4%-95.8%,which meets the requirements of rapid and accurate emergency monitoring.It provides a technical reference for the determination of sulfide in water of sudden environmental events.
关键词
应急监测/硫化物/便携式气相分子吸收光谱仪/稳定性
Key words
emergency monitoring/sulphide/portable gas phase molecular absorption spectrometer/stability
维普
万方数据