Study On Contamination Characteristics Of Polyeyelic Aromatic Hydrocarbons And Antibiotics Of Liaohe River In Jilin Province

Polyeyelic aromatic hydrocarbon(PAHs) are a group of persistent organic pollutants(POPs), which are widespread environmental contaminanted. PAHs are the most classic of chemicals that could cause cancer lesions to human and animals in the environment. PAHs have the greatest threat to ecological environment and human beings. Antibiotic are a group of emerging Contaminants,its half lifer are shorter compared with conventional contaminants(like PAHs, heavy metal), but long term, large amount and frequent emission will cause “pseudo-persistent”, increased bacterial resistance and threaten ecological environment and human health. So far few studies have been carried out on contamination characteristics of PAHs and antibiotic of Liaohe River in Jilin province. The objective of this study was to investigate the contamination characteristics of PAHs and antibiotic of water and sediment in this basin.To provides important reference and technical support for the management of priority contaminants in this basin.This study selected 16 US EPA priority individual PAH compounds and 12 typical antibiotics as target contaminants. Based on the measure of the concentration of PAHs and antibiotics in surface water and sediment of Liaohe River in Jilin province, the distribution characteristics, sources and ecological risk assessment will be analyzed.The results indicated that 9 and 10 kinds of PAHs were detectable in water and sediment of Tiaozi River, respectively, 5-6 ring components were not detected. The total concentrations were from 473.4 to 2673.8ng/L, from 601.3 to 2906.2 ng/g in surface water and sediment, respectively. The kinds of PAHs in East Liaohe River varied from 9 to 14, from 15 to 16 in surface water and sediment, respectively. The total Concentrations in East Liaohe River varied from 1350.1 to 1708 ng/L, from160.1 to 461.2.6 ng/g, respectively, with a mean value of 1524.3 ng/L, 303.0 ng/g respectively. The trends of spatial distribution of PAHs in water and sediment of Tiaozi River and East Liaohe River are similar: the concentration of PAHs presented a distinctly decreasing trend from the upstream to downstream. The characteristic ratio method and principal components analysis(PCA)/ factor analysis method were applied to analysis the source of PAHs in this basin. The dominant source were combustion of coal and vehicular traffic pollution, followed by combustion of firewood, straw and other biomass fuels. The ecological risk assessment of PAHs in water based on BaP toxicity equivalent method indicated that PAHs in the water of Tiaozi River and East Liaohe River had certain ecological risk, but the pollution degree of PAHs in East Liaohe River was higher than Tiaozi River. The ecological risk assessment of PAHs in sediment, based on the sediment quality guidelines quotient(SQGs) and quotient method indicated that biological toxicity effects may take place, but the possibility was less than 10%.The total concentrations of antibiotic of Liaohe River in Jilin province were varied from 103.6 to 1333.5 ng/L, from1.8 to 954.2 ng/g in surface water and sediment, respectively. OFL, ERM-H2 O, ROM were the mostfrequently detectedcompounds in 100% of the water samples. OFL, ERM-H2 O, ROM were the predominant antibiotics in the water; OFL, OTC and NOR were the predominant antibiotics in the sediment. The concentrations of antibiotics in water were significantlyhigher in the dry season than in the wet season.The concentrations of antibiotics in sedimentsdid not show significant seasonal variations.The spatial distribution of antibiotics showed large variationsamong the sampling sites. The highest concentrations and detectionfrequency ofantibiotics were found at Tiaozi River, followed by East Liaohe River, and the lowest at Zhaosutai River. The ecological risk assessment ofantibiotics in the water based onrisk quotient(RQs) indicated thatSTX, OFL, ENR could cause medium risk to plant and OFL、OTC、ERM could cause high risk to algae. The mixture HQs were 11.2, 1.3, 1.1 for algae, plant and invertebrates, respectively. The results indicated thatthese species may be negatively affected by antibioticmixtures in the Liaohe River in Jilin province...