Analysis of the Content of Halogenated Hydrocarbons in Water From 2018 to 2023 in Qingpu District of Shanghai
Objective:To understand the quality of water environment in Qingpu District of Shanghai,and to provide scientific basis for the management of drinking water quality in this area.Methods:The monitoring and statistical analysis of halogenated hydrocarbons in various types of water(source water,finished water,pipe network water and secondary water supply)in Qingpu District from 2018 to 2023 were carried out.Results:Except for trichloromethane,the other halogenated hydrocarbons were not detected in all kinds of water from 2018 to 2023 in Qingpu District of Shanghai.Trichloromethane was also not detected in source water,but it was detected in different degrees in finished water,pipe network water and secondary water supply.The fluctuation range from 0 μg·L-1 to 0.030 2 μg·L-1,but there was no excessive situation.The detection rate of trichloromethane in finished water,pipe network water and secondary water supply in 2018 and 2019 was significantly higher than that in 2020 and 2023(p＜0.05).The correlation analysis of trichloromethane and conventional pollution indicators in water during different epidemic periods showed that except for the consistent positive correlation between CODMn and trichloromethane in various types of water,the correlation between ammonia nitrogen,nitrite nitrogen,nitrate nitrogen and chloroform varied in different types of water.Conclusion:Level of halogenated hydrocarbons in various types of water showed a declining trend.The organic pollution represented by CODMn has a certain influence on the formation of chlorinated disinfection by products in water.
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