抚河南昌段重金属空间分布特征及来源分析

为分析抚河南昌段流域水体中重金属空间分布特征及可能来源，2019年08月在抚河南昌段共采集了23个地表水样及8个地下水样，对水体中的重金属V、Mn、Ba、Fe、Sr、Zn及类金属元素As进行了测定.结果表明，水体中不同重金属空间分布特征总体趋势一致，即中下游地区高于上游地区，污染特征空间差异性为中等及以上.地表水中V、Fe、Mn的平均浓度超过《地表水环境质量标准》（GB3838-2002）集中式生活饮用水特定项目标准限值；地下水中类金属元素As平均浓度超过《地下水质量标准》（GBT14848-2017）Ⅲ类水质标准.多元统计分析表明Sr、Ba、Mn可能主要来源于人类生产、生活污染物的排放，Fe、V、Zn可能主要来源于农业渔业及交通污染，类金属元素As主要来源于沿岸及河流底部淤泥及岩石碎屑.

Distribution characteristics and source analysis of heavy metals in Nanchang section of the Fuhe River

In order to investigate the spatial distributions and potential origins of heavy metals in the water bodies of Nanchang section of the Fuhe River, 23 surface water samples and 8 groundwater samples were collected in August of 2019. Seven heavy metals, namely:vanadium (V), manganese (Mn), barium (Ba), iron (Fe), strontium (Sr), zinc (Zn), and metalloid arsenic (As) were analyzed. Seven heavy metals generally had similar distribution patterns in water bodies, showing higher concentrations in the midstream and downstream portions of the river as compared to upstream part. The spatial difference of water pollutions was shown to be in middle and higher levels. Average concentrations of V, Fe and Mn in the surface water were higher than their thresholds set for centralized drinking water standard, as specified in the environmental quality standard for surface water (GB3838-2002). Average concentration of As in groundwater exceeded the threshold set for water quality standard class Ⅲ (GBT14848-2017). Multivariate statistical analysis showed that Sr, Ba and Mn probably mainly originated from the human discharges and industrial sewage, while Fe, V and Zn might be derived from the agricultural, fishery and traffic pollutions. Arsenic contaminations mainly be attributed to rocks and debris occurring in river bank and sediments at the bottom of the river.