Derivation of ecological criteria for copper in land-applied biosolids and biosolid-amended agricultural soils

文献类型： 外文期刊

第一作者： Lu, Tao

作者： Lu, Tao;Zhu, Nanwen;Lu, Tao;Li, Jumei;Wang, Xiaoqing;Ma, Yibing;Smolders, Erik

作者机构：

关键词： Ecological criteria;China;Copper;Biosolids;Availability

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The difference in availability between soil metals added via biosolids and soluble salts was not taken into account in deriving the current land-applied biosolids standards. In the present study, a biosolids availability factor (BAF) approach was adopted to investigate the ecological thresholds for copper (Cu) in land-applied biosolids and biosolid-amended agricultural soils. First, the soil property-specific values of HC5(add) (the added hazardous concentration for 5%.of species) for Cu2+ salt amended were collected with due attention to data for organisms and soils relevant to China. Second, a BAF representing the difference in availability between soil Cu added via biosolids and soluble salts was estimated based on long-term biosolid-amended soils, including soils from China. Third, biosolids Cu HC5(input) values (the input hazardous concentration for 5% of species of Cu from biosolids to soil) as a function of soil properties were derived using the BAF approach. The average potential availability of Cu in agricultural soils amended with biosolids accounted for 53% of that for the same soils spiked with same amount of soluble Cu salts and with a similar aging time. The cation exchange capacity was the main factor affecting the biosolids Cu HC5(input) values, while soil pH and organic carbon only explained 24.2 and 1.5% of the variation, respectively. The biosolids Cu HC5(input) values can be accurately predicted by regression models developed based on 2-3 soil properties with coefficients of determination (R-2) of 0.889 and 0.945. Compared with model predicted biosolids Cu HC5(input) values, current standards (GB4284-84) are most likely to be less protective in acidic and neutral soil, but conservative in alkaline non-calcareous soil. Recommendations on ecological criteria for Cu in land-applied biosolids and biosolid-amended agriculture soils may be helpful to fill the gaps existing between science and regulations, and can be useful for Cu risk assessments in soils amended with biosolids. (C) 2016 Elsevier Ltd. All rights reserved.

分类号： X32

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