摘要
环状挥发性甲基硅氧烷(cVMSs)因进入环境后存在潜在生态风险而受到广泛关注.研究采样测定滁河南京段地表水、沉积物及周边土壤中八甲基环四硅氧烷(D4)、十甲基环五硅氧烷(D5)和十二甲基环六硅氧烷(D6)3 种cVMSs的浓度水平,并对其生态风险进行了评价.结果表明:地表水中D4、D5、D6 的检出率分别为 38.1%、95.2%、100%,总含量范围为 13.66～77.90 ng·L-1,平均值为 47.82 ng·L-1;沉积物中D4、D5、D6 的检出率分别为 66.7%、86.7%、100%,总含量范围为 0.56～49.74 μg·kg-1,平均值为 13.95 μg·kg-1;土壤中D4、D5、D6 的检出率分别为 66.7%、20%、100%,总含量范围为 1.90～7.05 μg·kg-1,平均值为 3.57 μg·kg-1.地表水和土壤中D6 的检出浓度最高,沉积物中则为D5,对比国内外其他地区的相关结果,cVMSs处于中低水平.生态风险评价结果显示,滁河南京段水体中cVMSs存在中高风险.
Abstract
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.
基金项目
生态环境部南京环境科学研究所创新团队建设项目(ZX2023QT003)
国家重点研发计划(2018YFC1801601)
维普
万方数据