河北省石家庄市藁城区富硒土壤特征、成因与生态环境健康评价

硒对人体健康有着重要影响.本文以藁城为研究区,利用HG-AFS及ICP-MS等对研究区不同介质中的硒和重金属元素含量进行测试分析,探讨了藁城土壤硒含量特征、主要成因及来源,并对该地生态环境健康进行了评价.结果表明,藁城表层土壤硒均值为0.32 mg/kg,富集系数达到1.68,在研究区南部普遍较高,约171.12 km...

Characteristics, causes and ecological environment health evaluation of Selenium-enriched soil in Gaocheng District of Shijiazhuang City, Hebei Province

Selenium has an important impact on human health. This paper takes Gaocheng as a research object to test and analyze the content of selenium and heavy metal elements in different media in the study area with HG-AFS and ICP-MS method. Based on the discussing of the characteristics, main causes and sources of selenium content in soil, the health of the local ecological environment is evaluated. The results show that the average selenium in the surface soil of Gaocheng is 0.32mg/kg, and the enrichment coefficient reaches 1.68, which is generally higher in the southern part of the study area, about 171.12 km² reaching the standard of selenium-rich soil. The selenium enrichment in soil is mainly caused by human beings, and its main sources are coal burning and irrigation water. The selenium content of agricultural products in the selenium-rich area is much higher than that in the non-selenium-rich area, part of which meets the natural selenium-rich food standard. The selenium intake of residents is about 123.47 mg/d, which is at a reasonable level. The heavy metal pollution degree is Cd> Hg> Pb> Cu> Zn> Ni> As. The ecological risk assessmen of a single heavy metal t shows that Cd and Hg are the main hazard elements, and the other heavy metal potential risks are low. The human health risk assessment of heavy metals indicates that the non-carcinogenic and carcinogenic risk indexes in the study area are within a safe range, and oral intake is a source of health. Children are more vulnerable to oral intake than adults.