不同粒度CuO及与乙基黄原酸钾复合污染对土壤脲酶和微生物多样性的影响

发布时间：2018-04-26 00:14

本文选题：纳米氧化铜颗粒 + 微米氧化铜颗粒　；参考：《中国环境科学》2017年04期

【摘要】：纳米氧化铜不同于常规的氧化铜,纳米氧化铜的尺寸小,比表面积大,对生态环境存在潜在危害.本次通过向土壤中加入不同比例的纳米氧化铜(N CuO)和微米氧化铜(M Cu0)(0,50,200,800,1600mg/kg干土)观察它们对土壤脲酶活性和}0菌群落的影响.同T,进一步研究了N CuO和M CuO分R%与乙基黄原酸钾(PEX)复合污染对土壤微生物的影响.N CuO较M CuO对脲酶活性有更强的抑制作用,只有M CuO浓度为1600mg/kg对脲酶的影响较明显.N CuO对脲酶活性的抑制可能与破坏细菌的}0胞膜或刺激细菌产生活性氧,造成}0菌}0胞的衰退有关,N CuO对细菌群落结构的影响也较大.N CuO与PEX复合污染加剧了N CuO对土壤微生物的毒性,使脲酶的活性大幅度降低,细菌的群落结构也发生了较大的变化.N CuO及其复合污染对土壤微生物的作用机制需进一ki研究.通过比较研究N CuO和M CuO的生态毒性,纳米颗粒的生态毒性更需要引起足够的重视.
[Abstract]:Nanometer copper oxide is different from the conventional copper oxide. The size of nanometer copper oxide is small and its specific surface area is large, which has potential harm to ecological environment. In this paper, the effects of different proportions of nano-cupric oxide N CuO and micron copper oxide on soil urease activity and bacterial community were observed by adding different proportions of nano-CuO and micron copper oxide mCuO (50200800mg / kg dry soil) to the soil. At the same time, the effects of N CuO and M CuO fraction R% and ethyl xanthate potassium pex on soil microorganism were further studied. N CuO had stronger inhibitory effect on urease activity than M CuO. The inhibitory effect of N CuO on urease activity was more obvious when M CuO concentration was 1600mg/kg. The inhibition of urease activity by N CuO might be related to destroying the cell membrane of bacteria or stimulating bacteria to produce reactive oxygen species. The effect of N CuO on bacterial community structure was also significant. The compound pollution of N CuO and PEX aggravated the toxicity of N CuO to soil microorganism and significantly decreased the activity of urease. The community structure of bacteria also changed greatly. The action mechanism of N CuO and its compound pollution on soil microorganism should be further studied. By comparing the ecological toxicity of N CuO and M CuO, enough attention should be paid to the ecological toxicity of nanoparticles.
【作者单位】：北京科技大学能源与环境工程学院;北京科技大学工业典型污染物资源化处理北京市重点实验室;中国科学院生态环境研究中心;
【基金】：国家自然科学基金资助项目(41273091) 科技北京百名领军人才培养工程资助项目(LJ201620)
【分类号】：X53;X172

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