Pollution Level and Ecological Risk Assessment of Cyclic Volatile Methylsiloxanes in the Environmental Media in Nanjing Section of Chuhe River
Cyclic volatile methylsiloxane(cVMSs)has attracted extensive attention due to its potential ecological risks af-ter entering the environment.In this study,the samples were collected to analyze concentrations of octamethylcyclotetrasi-loxane(D4),decamethylcyclopentasiloxane(D5)and dodecamethylcyclohexasiloxane(D6)in the surface water,sedi-ment and surrounding soil of Nanjing section of Chuhe River,and their ecological risks were evaluated.The results show that the detection rates of D4,D5 and D6 in surface water were 38.1%,95.2%and 100%,respectively,and the range of total concentration of cVMSs was13.66-77.90 ng·L-1,with an average of 47.82 ng·L-1.The detection rates of D4,D5 and D6 in the sediments were 66.7%,86.7%and 100%,respectively,and the range of total concentration of cVMSs was 0.56-49.74 μg·kg-1,with an average of 13.95 μg·kg-1.The detection rates of D4,D5 and D6 in the soils were 66.7%,20%and100%,respectively,and the range of total concentration of cVMSs was1.90-7.05 μg·kg-1,with an average of 3.57 μg·kg-1.The highest detected concentration of D6 was in surface water and soil,while in sediment it was D5.Compared with the results from other regions at home and abroad,concentrations of cVMSs in Nanjing Section of Chu-he River were in the middle-low level.The ecological risk assessment results show a medium/high risk of cVMSs in Nan-jing section of Chuhe River.
methylsiloxanesecological riskconcentration levelNanjing section of Chuhe River
万方数据
维普
