Spatial distribution, risk assessment, and source identification of pollutants around gold tailings ponds: a case study in Pinggu District, Beijing, China

2021 ◽  
Vol 193 (8) ◽  
Author(s):  
Lin Fu ◽  
Zhongjian Zhang ◽  
Qiguo Zhang ◽  
Hao Zhang
Keyword(s):  
Risk Assessment ◽  
Spatial Distribution ◽  
Source Identification ◽  
Tailings Ponds ◽  
Beijing China ◽  
Gold Tailings

scholarly journals Spatial distribution, source identification, and risk assessment of organochlorines in wild tilapia from Guangxi, South China

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yang Ding ◽  
Zhiqiang Wu ◽  
Ruijie Zhang ◽  
Yaru Kang ◽  
Kefu Yu ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Spatial Distribution ◽  
Cancer Risk ◽  
South China ◽  
Lipid Content ◽  
Source Identification ◽  
Diagnostic Ratios ◽  
Guangxi Province ◽  
Feeding Intensity ◽  
Lifetime Cancer Risk

Abstract Seventy-five wild tilapia samples from six rivers (ten sites) in Guangxi province were collected and analyzed for 53 organochlorine compounds. DDTs, endosulfan, and PCBs were the most dominant compounds found in this study. Tiandong County (TD) and Guigang City (GG) sites were found to be heavily contaminated with high levels of endosulfan (385–925 ng/g lw) and/or DDTs (20.1–422 ng/g lw). The diagnostic ratios indicated that the residues of DDTs and endosulfan in wild tilapia are associated with historical applications as well as the recent introduction of technical DDTs and endosulfan at some sampling sites. The correlation between total length, body mass, and organochlorines (OCs) was higher than the correlation between age and lipid content. There was no significant correlation between organochlorine pesticides (OCPs) and lipid content. Therefore, for organisms, the feeding intensity (related to length and mass) of fish could better reflect degree of pollution than exposure time (age) of fish. The hazardous ratios for the 50th and 95th percentile data of OCPs and PCBs in fish were both below 1, suggesting that daily exposure to OCPs and PCBs yields a lifetime cancer risk lower than 1 in 10,000.

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