| Synthetic musk is a kind of medicine and personal care products,which have typical musk fragrance,excellent fragrance fixing performance and low price.Four synthetic musks(Galaxolide,Tonalide,Musk Xylene,and Musk Ketone)in 23 surface sediments of Beidai River wetland were determined by soxhlet extraction coupled with Gas Chromatography-Mass Spectrometry(GC-MS)analysis.Pollution levels,distribution characteristics and environmental risk assessment were conducted as well.The concentration of synthetic musks were in the range of 19.50-34.93 ng/g for Galaxolide(average content: 28.46 ng/g,dw)and 16.37-29.29 ng/g for Tonalide(average content:23.30 ng/g,dw).Musk Ketone was detected only in 5 samples,with a concentration ranging from below the detection limit(LOD)to 37.89 ng/g.Musk Xylene was not detected in all samples(MX).The results showed that the galaxolide and tonalide were the main musk contaminants in sediment,which accounted for 50.65%-100.00% of synthetic musks.Kolmogorov-Smirnov(K-S)inspection of 3 kinds of synthetic musks from 23 sediment samples were analyzed.It was found that concentrations of HHCB and AHTN were statistically significant(<0.01),which indicated there were similar sources and fate between HHCB and AHTN.The estimation of AHTN and HHCB accumulations in the sediments of Beidaihe wetland were 510.270 g and 623.274 g,respectively.Environmental risk assessment showed that the actual detection concentration was lower than the predicted ineffective concentration of HHCB and AHTN in sediments,and there was no acute risk in theory.In the study,the sorption of Tonalide(AHTN),Musk Xylene(MX),Galaxolide(HHCB),and Musk Ketone(MK)by microplastics of polyethylene(PE)and polyvinyl chloride(PVC)in simulated seawater was examined.The effects of time,temperature,and salinity on the adsorption of 4 kinds of synthetic musk by microplastics of PE and PVC are studied.Results indicate that the equilibrium sorption time was about10 h and the adsorption kinetics model conformed to the first-order adsorption kinetic model and pseudo-second-order kinetic model,this indicates that the main adsorption mechanism might be chemical adsorption and physical absorption,respectively.Adsorption reached a nadir at 15°C and 14% salinity.The adsorption capacity of PVC was higher than that of PE in the above conditions.Due to the specific surface area and the pore volume of PVC was larger than PE. |
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