As Background values 砷背景特征
soil background values 土壤背景值
native background-values 自然背景值
natural background values 自然背景值
element background values 化学元素背景值
We can conclude that:1. The content of the copper and cadmium in the soil are far more than background values, in which, the copper is dominated by the residue form and the cadmium is by the exchange form.
得出的主要结论如下:(1)原土中铜、镉含量均远远超过当地土壤背景值,铜主要以残渣态为主,性质较稳定;镉以可交换态为主,易对生物体和环境产生毒害作用。
参考来源 - 柠檬酸、铁氧化物交互作用对土壤中铜、镉元素形态影响研究Results show that the calculated geochemical baselines can reflect natural variation of soil Cu and Pb background values between different sampling sites.
结果表明,稳健回归方法确定的表层土壤Cu、Pb基线值可以反映出不同样点间,土壤Cu、Pb背景含量的自然变异。
参考来源 - 基于稳健统计学确定高潜在污染土壤Cu、Pb基线值But Pb and Cd have higher contents, whose area percentage under natural background values is 84.01% and 20.56%, respectively.
Pb含量稍高,其中Pb低于自然背景值的比例为84.01%,而Cd含量偏高,仅有20.56%低于自然背景值。
参考来源 - 四川省罗江县土地质量地球化学评估与农用地分等结果整合研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The natural background values of Hg in soils of Dalian was also obtained.
给出了大连市土壤中汞的自然背景含量。
The geochemical field of the Hefei Basin belongs to that of low background values, low moisture and inhomogeneity.
合肥盆地地球化学空间场属低背景、低湿度和非均匀场范畴。
Some groundwater environmental background values were suggested to be the important reference index of groundwater oil pollution.
提出地下水环境对照值可以作为地下水是否受到油类污染的重要参考指标。
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