title: [Arsenic Content and Speciation in the Surficial Sediments of Liangshui River in Beijing].
abstract: Arsenic (As) content and speciation in the surface sediments of the typical urban river ( Liangshui River) with unconventional water sources in Beijing were investigated by different methods, including BCR three-step sequential extraction procedure, enrichment factor (EF), risk assessment code (RAC) and sediment quality guidelines (SQGs). The results showed that total As contents in the surface sediments ranged from 2.18 mg x kg(-1) to 22.5 mg x kg(-1), with an average of 6.01 mg x kg(-1), and most of them were lower than the soil background value. In terms of speciation, As mainly existed in B4 ( with an average content of 3. 93 mg x kg(-1)), and the contents of the four forms followed the sequence: B4 > B2 > B3 > B1. In addition, the percentage of biological available As was 39. 61%. The EF values due to As showed there was not significant enrichment in most studied sediments. The analysis results of RAC showed that the surface sediments from 60% of the sampling sites posed moderate risk, and 40% of the sampling points showed low risk. The results of SQGs showed that As content in the surface sediments from 55% of the sampling points was below the threshold effect level (TEL), and that in 40% of the sampling points was between TEL and probable effects level (PEL).
authors.forename: Xin-hui
authors.initials: XH
authors.lastname: Wang
authors.forename: Bao-qing
authors.initials: BQ
authors.lastname: Shan
authors.forename: Wen-zhong
authors.initials: WZ
authors.lastname: Tang
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Chuang
authors.initials: C
authors.lastname: Wang
mesh_terms: D001151:Arsenic / Q000032:analysis*; D000068476:Beijing; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D018570:Risk Assessment; D045483:Rivers / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D012987:Soil; D014874:Water Pollutants, Chemical; D001151:Arsenic