其他题名Extractability, Bioavailability and Toxicity of Cu in Farmland Soils with Different Properties
朱侠1,2; 李连祯1
; 涂晨1; 骆永明2,3发表期刊土壤
ISSN0253-9829
2020
卷号52期号:5页码:911-919
关键词土壤铜可提取性生物有效性生物毒性阈值
研究领域Environmental Sciences & Ecology
英文摘要The environmental quality standards based on total contents of heavy metals can't meet the requirements of current soil management, studies on risk assessment and toxicity threshold that considering the bioavailability of heavy metals have great significance for the revision of corresponding standards.In this study, three farmland soils with different properties, i.e, black soil, meadow cinnamon soil, unsubmerged paddy soil, were selected and biological toxicity tests were conducted by simulating Cu pollution, four chemical extractants with different extraction capacities, including HNO_3, EDTA-Na_2, NH_4OAc and CaCl_2, were used to extract bioavailable Cu, the relationship between Cu extractability, bioavailability and toxicity were analyzed, and the toxicity thresholds of Cu were deduced for lettuce and earthworm Eisenia foetida.The results showed that HNO_3(41.4%) and EDTA-Na_2(56.8%) had strong Cu extraction ability, but NH_4OAc(0.12%) and CaCl_2(8.70%) had weak ability.Cu extracted by CaCl_2 significantly correlated with Cu accumulated in lettuce, the toxic effect, and the acute mortality of earthworms, while Cu extracted by HNO_3 significantly correlated with the chronic toxicity and Cu accumulated in earthworms.Based on the effective concentration of different extractable Cu, the deduced EC20 for lettuce ranged from 90.5 mg/kg to 170 mg/kg based on HNO_3, 103 mg/kg to 195 mg/kg based on EDTA-Na_2, 3.97 mg/kg to 20.1 mg/kg based on NH_4OAc and 0.21 mg/kg to 8.68 mg/kg based on CaCl_2, while the deduced EC20 for earthworm Eisenia foetida ranged from 138 mg/kg to 193 mg/kg based on HNO_3, 108 mg/kg to 226 mg/kg based on EDTA-Na_2, 8.92 mg/kg to 11.6 mg/kg based on NH_4OAc and 0.36 mg/kg to 10.6 mg/kg based on CaCl_2.The deduced EC50 for lettuce ranged from 110 mg/kg to 188 mg/kg based on HNO_3, 119 mg/kg to 230 mg/kg based on EDTA-Na_2, 5.69 mg/kg to 32.2 mg/kg based on NH_4OAc and 0.26 mg/kg to 9.62 mg/kg based on CaCl_2, while the deduced EC50 for earthworm Eisenia foetida ranged from 183 mg/kg to 221 mg/kg based on HNO_3, 180 mg/kg to 331 mg/kg based on EDTA-Na_2, 13.1 mg/kg to 18.3 mg/kg based on NH_4OAc and 0.54 mg/kg to 13.2 mg/kg based on CaCl_2.The results have great significance for the selection and optimization of effective extraction methods of heavy metals in soils and the revision of environmental quality standards based on heavy metals bioavailability.
中文摘要以重金属总量为基础的土壤环境质量标准已不适用于当前土壤管理的需求,基于重金属生物有效性的生态风险评估和环境阈值研究对土壤重金属环境质量标准的修订具有重要的指导意义。本研究选取黑土、潮褐土和脱潜水稻土3种不同性质的农田土壤,开展模拟铜(Cu)污染的生物毒性试验,采用HNO_3、EDTA-Na_2、NH_4OAc和CaCl_2 4种不同浸提能力的化学试剂进行土壤有效态Cu提取,探讨Cu可提取性与生物有效性及毒性的关系;并通过敏感性生态物种生菜和赤子爱胜蚓的Cu暴露试验,推导基于化学提取有效态的土壤Cu生态毒性阈值。研究结果表明:HNO_3(41.4%)和EDTA-Na_2(56.8%)对3种土壤中Cu的平均提取效率显著高于NH_4OAc(0.12%)和CaCl_2(8.70%)。CaCl_2提取态Cu含量与生菜Cu富集量和毒性效应之间存在显著或极显著相关,HNO_3提取态Cu含量则能很好地指示蚯蚓Cu富集量和30 d死亡率。不同生态受体毒性终点对土壤可提取态Cu的敏感性存在差异,选用物种最敏感指标推导3种土壤中Cu的有效态毒性阈值EC20和EC50,结果显示,基于不同化学提取态Cu含量的生菜毒性阈值EC20范围分别是90.5 ~ 170 mg/kg(HNO_3)、103 ~ 195 mg/kg(EDTA-Na_2)、3.97 ~ 20.1 mg/kg(NH_4OAc)和0.21 ~ 8.68 mg/kg(CaCl_2),EC50范围分别是110 ~ 188 mg/kg(HNO_3)、119 ~ 230 mg/kg(EDTA-Na_2)、5.69 ~ 32.2 mg/kg(NH_4OAc)和0.26 ~ 9.62 mg/kg(CaCl_2);基于不同化学提取态Cu含量的赤子爱胜蚓死亡率毒性阈值EC20范围分别是138 ~ 193 mg/kg(HNO_3)、108 ~ 226 mg/kg(EDTA-Na_2)、8.92 ~ 11.6 mg/kg(NH_4OAc)和0.36 ~ 10.6 mg/kg(CaCl_2),EC50范围分别是183 ~ 221 mg/kg(HNO_3)、180 ~ 331 mg/kg(EDTA-Na_2)、13.1 ~ 18.3 mg/kg(NH_4OAc)和0.54 ~ 13.2 mg/kg(CaCl_2)。研究结果可为我国农田土壤重金属有效态化学提取方法的比选与优化提供科学依据,同时对基于生物有效性的土壤重金属环境质量基准与标准的研究和制定具有重要意义。
文章类型Article
资助机构国家重点研发计划项目; 中国科学院STS项目
收录类别CSCD
语种中文
CSCD记录号CSCD:6850152
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/30319
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位1.中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所),山东烟台264003;
2.中国科学院大学,北京100049;
3.中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008
推荐引用方式
GB/T 7714朱侠,李连祯,涂晨,等. 不同性质农田土壤中铜的可提取性与生物有效性及毒性[J]. 土壤,2020,52(5):911-919.
APA朱侠,李连祯,涂晨,&骆永明.(2020).不同性质农田土壤中铜的可提取性与生物有效性及毒性.土壤,52(5),911-919.
MLA朱侠,et al."不同性质农田土壤中铜的可提取性与生物有效性及毒性".土壤 52.5(2020):911-919.
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