河口潮间带沉积物重金属累积及生态风险评价

于2015年7月份在闽江口鳝鱼滩湿地布设两条样带(T1和T2),并分别选取5个采样点采集沉积物样品。因重金属Co和V对动物和人类会造成一定危害,且闽江河口潮间带Co和V的研究较少,则对其理化性质、Co和V的空间分布特征以及污染程度等进行了研究,旨在为Co和V的污染研究提供参考。结果显示,该沉积物中Co和V的平均浓度分别为15.19 mg/kg、102.94 mg/kg,均高于福建省背景浓度,与其他河口对比,Co和V浓度处于中等水平。Co和V的含量由陆向海方向略有下降。地累积指数法分析得出沉积物中Co含量呈现轻度污染状态,V呈现无污染状态。此外,Co和V的潜在生态危害系数E_rⁱ分别为7.24—14.85和1.47—4.17,表明潜在生态危害轻微,闽江河口潮间带沉积物中Co和V属于轻度污染。

Accumulation and ecological risk assessment of heavy metals in estuarine intertidal sediments

In July 2015, two sample strips (T1 and T2) were laid in the squid beach wetland of Min River Estuary, and five sampling sites were selected to collect sediment samples. Due to the harmful effects of heavy metals Co and V on human beings and animals, and few studies on Co and V in the intertidal zone of the Min River Estuary, the physical and chemical properties, spatial distribution characteristics of Co and V, and the degree of their pollution were studied to provide data reference for pollution research of Co and V. The results showed that the average concentrations of Co and V in the sediment were 15.19 mg/kg and 102.94 mg/kg respectively, which were higher than the background concentration in Fujian Province. Compared with other estuaries, the concentrations of Co and V were moderate. The contents of Co and V decreased slightly from the land to the sea. The ground accumulation index method showed that the Co content in the sediment was slightly polluted, and V showed no pollution. In addition, the potential ecological hazard coefficients of Co and V were 7.24-14.85 and 1.47-4.17 respectively, indicating that the potential ecological hazard was slight. Co and V in the intertidal sediments of the Min River estuary were mildly polluted.