浏阳河河床蔬菜中重金属含量及污染评价

浏阳河河床蔬菜中重金属含量及污染评价(7700字)
摘要：为了解河床种植蔬菜的重金属污染状况，本实验以浏阳河河床种植蔬菜为研究对象，采用原子吸光光度法对蔬菜样品中Pb、Cr、Cd、Cu4种重金属含量进行了分析测定。结果表明：4个采样点分别采取的16种蔬菜样品中重金属含量均已严重超过中华人民共和国食品卫生评价标准《无公害蔬菜生产土壤环境质量指标(GB／T18407．1-2001)》允许含量。Cd元素平均超标达24.3倍，Pb元素平均超标17.5倍，Cu元素平均超标11倍， Cr元素超标程度最小，平均为2.1倍。
关键词：浏阳河；重金属；蔬菜

Heavy metals content in vegetables and pollution analysis on  Riverbank of Liuyang River
Abstract: This experiment measures 5 types of heavy metal Pb Cr Cd Cu As content in vegetable samples collected on both banks of Liuyang river, calculating unattainment rate of heavy metal content in vegetable samples according to national standard, then concluding that heavy metal pollution extent of Liuyang river and making its pollution analysis. The results indicate that heavy metal content of four vegetables samples collected from 4 samping points both are far beyond the standard, especially content of Cd and Pb exceed standard with 30 times. Heavy metal pollution of Liuyang river region not only seriously influences normal domestic water supply of residents in this region, but also causes heavy metal poisoning of residents in the region, significant reduction in fish resource, dilapidation of large tracts of farmland, even leading local fish, grain and vegetables not to be eaten.
Keyword:  Liuyang River；Heavy metal；vegetables