Heavy Metals and As Concentrations and Contamination Assessment in Mygcctopus Oleivorus Solenaia oleivora in Anhui Sections of Huai River
ZHAO Xiuxia, FANG Ting, YANG Kun, LIANG Yangyang, CHEN Cheng, LU Wenxuan
1. Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230001, China; 2. Key Laboratory of Freshwater Aquaculture and Fishery Enhancement of Anhui Province, Hefei 230001, China
Abstract：In order to explore heavy metals and As distribution characteristics and pollution situations of mygcctopus oleivorus Solenaia oleivora in Anhui sections of Huai River, concentrations of heavy metal elements (Hg, Cd, Cr, Pb), and arsenic (As) in sediments (0—20 cm) and heavy metals (Hg, Cd, Cr, Pb, Cu, Zn) and arsenic (As) in mygcctopus oleivorus with shell length of 13—18 cm, and body weight of 36.07—81.40 g were determined at 5 sampling sites along the Anhui section of Huai River main stream from April 20 to 26, 2020. The sediment environment and the risk posed by heavy metals and arsenic in organisms were evaluated using the geo-accumulation index (Igeo), potential ecological risk index (IR), single factor pollution index (ISF), and metal pollution index (IMP) methods. The results showed that the descending order of average contents of heavy metals and As in surface sediments were expressed as Cr(100.87 mg/kg)＞Pb(31.20 mg/kg)＞As(8.97 mg/kg)＞Cd(0.15 mg/kg)＞Hg(0.04 mg/kg), and the descending order of Igeo values were described as Cd>Cr>Pb>Hg>As, with the slightly pollution of Cd and Cr, and safety for the others. The potential ecological risk assessment showed that the moderate potential risk coefficient (Er)was observed in Cd, Hg, and the overall slightly ecological risk in heavy metals and As. The descending order of average values of As and heavy metals in S. oleivora organisms was shown as: Zn(149.87)>Cu(18.26)>As(3.80)>Cr(0.96)>Pb(0.81)>Cd(0.26)>Hg(0.03). Then a single factor index (ISF) showed that the As and Zn was in severely pollution, according to the IMP, whose values ranked as 2.50 in gill, 1.95 in mantles, 1.76 in adductor muscle and 1.37 in foot. The potential ecological risk of heavy metals and As in Anhui section of Huai River, and the comprehensive pollution level of heavy metals and As in S. oleivora were low,but the exceeding set standard of As and Zn should be paid more attention.
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2026, Vol. 45 
