Contaminations Of Methylsiloxane In The Environmental Media And Aquatic Organisms In Hefei

Methylsiloxane is often processed into silicone oil,silica gel,silane coupling agent,silicone resin,etc.,and is widely added to industrial products and personal care products.Some methyl siloxanes have potential hazards to organisms and human health due to their endocrine disrupting effects,genotoxicity and reproductive toxicity.With the development of industry,the production and use of Methylsiloxane are also increasing year by year.It is broadly found in water,soil,air and organisms.Some Methylsiloxane have potential hazards to organisms and human health due to their endocrine disrupting effects,genotoxicity and reproductive toxicity.However,the information of methylsiloxane contamination in environmental media is still very limited,especially the research on bioconcentration and tissue distribution in organisms is rare.As a result,the scientific understanding of environmental behavior and risk of Methylsiloxane are severely restricted,which are not conducive to the management of environmental risks of methylsiloxane.In this study,the dust of Hefei City and the sediments from Chaohu Lake and its inflow rivers were selected as the research objects.The multi-media pollution characteristics of Methylsiloxane were analyzed,and the pollution sources of Methylsiloxane in dust and sediment were also examined.The accumulation characteristics and tissue distribution of methyl siloxane in aquatic organisns in Chaohu Lake were studied.And the migration behaviors of Methylsiloxane in aquatic organisms in food web were also investigated to evaluate their potential ecological risks.The results of this study will help to further understand the environmental biogeochemical behavior and risk of Methylsiloxane,and provide scientific basis for risk control and risk management of regional Methylsiloxane.The pollution characteristics,possible sources and human health risks of Methylsiloxane in road dust from Hefei City were studied.The results showed that the total content of 13 kinds of Methylsiloxane in road dust was 188.07-1101.72 ng/g.D5 and L11 are the main methylsiloxane pollutants in dust.Analysis of pollution sources indicated that Methylsiloxane in dust may be mainly derived from the release of Methylsiloxane both from the tire wear during vehicle driving and from the industrial and personal care products.The results of health risk studies showed that the average daily intake of 13 Methylsiloxane in this study was much lower than the safety threshold,and its risk to human health was minimal.The pollution characteristics and ecological risks of Methylsiloxane in sediments of Chaohu Lake and its inflow rivers were evaluated.The results showed that the total content of 13 Methylsiloxane was 89.4 ng/g-509.63 ng/g in the sediments of Chaohu Lake,and was 222.55 ng/g-3636.67 ng/g in the sediments of rivers entering the lake.The content of methylsiloxane in river sediments was much higher than that in Chaohu Lake.The composition of Methylsiloxane in the sediments of Chaohu Lake and its inflow rivers was similar,with D5 and L11 as the main components.Analysis of pollution sources showed that the pollution of Methylsiloxane in Chaohu Lake and rivers mainly came from the emission of Methylsiloxane used in industrial products.The evaluation results based on risk entropy method showed that there were basically no potential ecological risks for the three cyclic Methylsiloxane(D4,D5 and D6)in sediments.The accumulation of Methylsiloxane in aquatic organisms in Chaohu Lake was studied.Four kinds of cyclic Methylsiloxane were all detected.The total average concentration of four kinds of Methylsiloxane to be measured was 243 ng/g lw,of which the detection concentration of D6 was the highest,and that of D4 was the lowest.The content of Methylsiloxane in fish with different dietary habits was significantly different.Specifically,D3 and D4 were higher in the muscles of carnivorous fish,D5 was higher in the muscles of herbivorous fish,and D6 was higher in the muscles of omnivorous fish.In addition,the organisms/sediment enrichment factor(BSAF)of D3 indicated that D3 was more prone to enrichment in sediments,and the factors of D4,D5 and D6 were all greater than 1.7,showing that they tended to be enriched in the organisms.The tissue distribution of Methylsiloxane in four typical fishes was explored.On the whole,D3,D5 and D6 had the highest concentration in the liver,and D4 in the muscle.The liver accumulation rate of the four kinds of cyclic Methylsiloxane in carp was 0.42,and that of the other three kinds of fish was 0.59-0.71.In the aquatic food web of Chaohu Lake,the trophic magnification factor(TMF)of Methylsiloxane was 0.86-3.01,and the TMF value of D3 was greater than 1,indicating that D3 might have a biological magnification effect.The health risks of human consumption of fish based on the Methylsiloxane content in fish were assessed.The results showed that there was no significant human health risk of Methylsiloxane in Chaohu fish.