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土壤重金属污染现状及检测分析技术研究进展 - cgs.gov.cn
2021年2月8日 （3）高背景值地区的土壤重金属超标。比如西南地区土壤中，镉、铅、锌、铜、砷等背景值远远高于全国土壤的背景值。（4）土壤重金属污染呈流域性的趋势，而 2011年7月14日 砂子取样及检验操作规程 一、 取样 在料场或汽车上取样时，取样部位应均匀分布，取样前先将取样部位表面铲除，然后从不同部位抽取大致等量的8份，组成一组 砂子多少送检？_百度知道灌砂后砂质量(g) 试坑内砂质量(g) 试坑体积(cm3) 湿密度(g /cm3) 超粒径质量(g) 换算超粒径后湿密度(g /cm3) 盒号 盒+湿试样质量(g) 盒+干试样质量(g) 盒质量(g) 水质量(g) 干试样 灌砂法取样 - 百度文库
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