不同镉水平下纳米沸石对土壤pH、CEC及Cd形态的影响

发布时间：2018-05-08 09:53

本文选题：土壤镉污染 + 纳米沸石　；参考：《环境科学》2017年04期

【摘要】：通过室内培养试验及土培试验研究了不同镉水平(1、5、10和15 mg·kg~(-1))下纳米沸石和普通沸石对土壤pH、CEC及Cd形态的影响.结果表明,室内培养试验中,施用沸石(5、10和20 g·kg~(-1))均显著提高了不同镉(1、5、10和15 mg·kg~(-1))处理中的土壤pH和土壤CEC值,降低了土壤可交换态镉含量,增加了碳酸盐结合态、铁锰氧化态、有机态和残渣态镉含量,以纳米沸石(20 g·kg~(-1))对土壤可交换态镉的降低效果最好.土壤pH、土壤CEC与土壤可交换态镉含量呈极显著负相关(P0.01),与铁锰氧化态镉含量均呈极显著正相关(P0.01).土培试验中,在1 mg·kg~(-1)和5 mg·kg~(-1)Cd条件下,施用沸石(5、10和20 g·kg~(-1))使土壤可交换态镉FDC降低了6.4%~63.2%,使大白菜地上部去离子水提取态镉和乙醇提取态镉的分配比例分别降低了2.1%~56%和11.8%~100%,相同沸石使用量下的降低效果以纳米沸石优于普通沸石.在1 mg·kg~(-1)Cd条件下,大白菜地上部镉形态的FDC与土壤CAB-F和OM-F的FDC有显著相关性(P0.05);在5 mg·kg~(-1)Cd条件下,大白菜地上部镉形态的FDC主要与土壤OM-F和RES-F形态的FDC存在显著相关性(P0.05).
[Abstract]:The effects of nano-zeolite and ordinary zeolite on soil pH CEC and CD forms under different cadmium levels were studied by indoor and soil culture experiments. The results showed that in the indoor culture experiment, the pH and CEC value of soil were significantly increased by applying zeolite 5N 10 and 20 g KG-1) treatments, and the contents of exchangeable cadmium in soil were decreased, carbonate bound state and ferromanganese oxidized state were increased, and the soil pH and soil CEC value were significantly increased in the treatments of different CD ~ (2 +) ~ (2 +) ~ (1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) C ~ (2 +). The content of cadmium in organic and residual forms was the best for the reduction of exchangeable cadmium in soil by nano-zeolite (20 g 路kg ~ (-1) 路kg ~ (-1)). Soil pH, soil CEC and soil exchangeable cadmium content were negatively correlated with P0.01N, and positively correlated with Fe-Mn oxide cadmium content. In the soil culture test, under the conditions of 1 mg / kg ~ (-1) and 5 mg / kg~(-1)Cd, Application of zeolites 5 ~ 10 and 20 g 路kg ~ (-1) 路kg ~ (-1) C ~ (-1) reduced soil exchangeable cadmium FDC by 6.4 ~ 63.2%, and reduced the distribution ratio of deionized water extracted cadmium and ethanol ~ (-1) cadmium in Chinese cabbage by 2.1% and 11.88%, respectively. The effect of the same amount of zeolite on the reduction was as follows: (1) in the same amount of zeolite used, the content of cadmium in the soil was reduced by 6. 4% and 63. 2% respectively. Nano-zeolite is superior to ordinary zeolite. Under the condition of 1 mg kg~(-1)Cd, there was a significant correlation between the FDC of shoot cadmium form of Chinese cabbage and the FDC of CAB-F and OM-F in soil, and the FDC of CD form in shoot part of Chinese cabbage was significantly correlated with OM-F and FDC of RES-F form under 5 mg kg~(-1)Cd condition.
【作者单位】：西南大学资源环境学院;武汉大学资源环境学院;
【基金】：现代农业产业技术体系建设专项(Nycytx-25) 国家自然科学基金项目(20477032) 国家科技支撑计划项目(2007BAD87B10)
【分类号】：X53

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