云南阳宗海砷污染治理后水体和沉积物中砷的赋存特征  

Occurrence Characteristics of Arsenic in Water and Sediment after Arsenic Pollution Control in Yangzonghai Lake,Yunnan

作　　者：邓春暖[1] 徐丽琼 李宏溪 张浩[1] DENG Chun-nuan;XU Li-qiong;Li Hong-xi;ZHANG Hao(Faculty of Geography,Yunnan Normal University,Key Laboratory of Plateau Geographical Process and Environmental Change of Yunnan Province,Kunming Yunnan 650500,China)

机构地区：[1]云南师范大学地理学部,云南省高原地理过程与环境变化重点实验室,云南昆明650500

出　　处：《环境科学导刊》2021年第5期27-33,共7页Environmental Science Survey

基　　金：国家自然科学基金项目(21467031)资助。

摘　　要：通过采集阳宗海表层水样、上覆水水样和表层沉积物,测定水体砷含量和沉积物砷形态的组成,探讨阳宗海砷污染治理后表层水、上覆水和沉积物砷的空间分布特征和季节变化规律。结果表明,阳宗海表层水中高砷区域分布在西部和北部,平均浓度为18.46μg/L;上覆水中高砷区只集中在北部和东南部,上覆水总砷平均浓度为25.39μg/L;除春季表层水总砷浓度高于上覆水,其他三个季节表层水和上覆水总砷浓度差异不大,平均浓度为35μg/L。水体总砷浓度为春季含量最低,沉积物总砷春季含量最高。阳宗海表层沉积物砷平均浓度为24.13mg/kg,主要以残渣态砷为主,离子态砷、碳酸盐结合态砷和铁锰结合态砷含量很低。综上所述,阳宗海经过治理后,目前湖泊水体和沉积物中的砷浓度逐渐下降,生态风险进一步降低。By collecting surface water,overlying water and surface sediments samples in Yangzonghai Lake,arsenic in water and arsenic speciation in sediments were determined.The spatial distribution characteristics and seasonal variation law of arsenic after arsenic pollution control were discussed.The results showed that the high arsenic area in surface water was distributed in the Midwest and North of Yangzonghai Lake,and the average concentration of surface water was 18.46μg/L.In the overlying water,the high arsenic area was concentrated in the North and Southeast.The average concentration of total arsenic in overlying water was 25.39μg/L.In spring,the total arsenic concentration in surface water was higher than that in overlying water.There was no significant difference in total arsenic concentration of surface water and overlying water among the other three seasons.The average arsenic concentration of water was 35μg/L.The total arsenic concentration in water body was the lowest in spring,and the total arsenic content in sediment was the highest in spring.The average concentration of surface sediment was 24.13mg/kg.The arsenic in sediment was mainly residue-bound.Ionic arsenic,carbonate-bound arsenic and iron-manganese-bound arsenic were low in content.In conclusion,after controlling the pollution,the concentration of arsenic in lake water and sediment decreased gradually.The ecological risk of arsenic reduced further.

关 键 词：砷 空间分布 表层沉积物 上覆水 阳宗海 

分 类 号：X52[环境科学与工程—环境工程]