中文关键词镉污染土壤纳米氢氧化镁镉形态分布可交换态镉中、酸、碱性土 英文关键词cadmium contaminated soilnanometer magnesium hydroxidecadmium form and distributionEX-Cdneutral, acidic and alkaline soils

作者	单位	E-mail
邓继宝	西南大学资源环境学院, 重庆 400715	1907765118@qq.com
张春来	西南大学资源环境学院, 重庆 400715
徐卫红	西南大学资源环境学院, 重庆 400715	xuwei_hong@163.com

中文摘要 采用28 d室内连续培养实验，以纳米氢氧化镁和普通氢氧化镁（100、200和300 mg·kg^-1）为镉污染土壤钝化剂，研究了纳米氢氧化镁和普通氢氧化镁对不同类型镉污染土壤（1、5、10和15 mg·kg^-1）中镉形态的影响.结果表明，在中性土壤上，1、5、10和15 mg·kg^-1镉处理中土壤交换态Cd （EX-Cd）形态分布比例FDC为66.7%~81.8%，为土壤镉主要形态.土壤镉含量大小顺序为EX-Cd > 碳酸盐结合态Cd（CAB-Cd） > 残渣态Cd （RES-Cd） > 铁锰氧化态Cd （FeMn-Cd） > 有机结合态Cd （OM-Cd）.培养第14d时，土壤EX-Cd FDC达到最低值.培养0~28 d期间，在1、5、10和15 mg·kg^-1镉处理下，纳米氢氧化镁和普通氢氧化镁处理的土壤EX-Cd FDC较对照（CK）分别降低了11.4%~67.7%、7.8%~37.2%、7.7%~36.4%、5.0%~28.8%（纳米氢氧化镁）和0.5%~49.5%、0.6%~15.0%、1.0%~18.1%、0.7%~14.6%（普通氢氧化镁）.碱性土EX-Cd含量均在培养的第7 d时达到最低；酸性土在1、5和10 mg·kg^-1镉处理中土壤EX-Cd含量在第21d时达到最低值.纳米氢氧化镁和普通氢氧化镁均降低了中、酸、碱性土壤EX-Cd含量，且随氢氧化镁施加量的增加，土壤EX-Cd含量呈降低趋势.相同用量下，钝化土壤活性镉的效果以纳米氢氧化镁优于普通氢氧化镁. 英文摘要 The effects of nano-magnesium hydroxide and common magnesium hydroxide (100, 200, and 300 mg·kg^-1) on the forms of cadmium in different types of cadmium contaminated soils (1, 5, 10, and 15 mg·kg^-1) were studied under 28 days of continuous culture experiment. In the neutral soil, during the 28 days of culture, soil exchange Cd (EX-Cd) form distribution ratio (FDC) decreased at first and then increased with the culture time increasing under treatment of 1, 5, 10, and 15 mg·kg^-1 Cd. The minima of soil EX-Cd FDC were found on the 14th day under 1 mg·kg^-1 Cd and 5 mg·kg^-1 Cd treatments, whereas the minima of soil EX-Cd FDC were observed on the 4th day under 10 mg·kg^-1 Cd and 15 mg·kg^-1 Cd treatments. The FDC of soil carbonate bound Cd (CAB-Cd), iron manganese oxidized Cd (FeMn-Cd), and organic bound Cd (OM-Cd) increased at first, then decreased, and finally, became stable, and the maxima of soil CAB-Cd, FeMn-Cd, and OM-Cd FDC were found on the 4th day, whereas the minima of soil CAB-Cd, FeMn-Cd, and OM-Cd FDC were observed on the 14th day. Soil residual Cd (RES-Cd) FDC increased gradually and then tended to becomes stable during the 28 days of culture. The soil EX-Cd FDC was 66.7%-81.8% at 1, 5, 10, and 15 mg·kg^-1 Cd treatments, which was the main form of the soil. The FDC of soil Cd forms was in the order of EX-Cd > CAB-Cd > RES-Cd > FeMn-Cd > OM-Cd. Soil EX-Cd FDC reached the lowest value on the 14th Day. Soil EX-Cd FDC was reduced by nano-magnesium hydroxide and common magnesium hydroxide, and it decreased with the increase of the amount of magnesium hydroxide. During 0-28 days of culture, the soil EX-Cd FDC decreased by 11.4%-67.7%, 7.8%-37.2%, 7.7%-36.4%, 5.0%-28.8% (nano-magnesium hydroxide) and 0.5%-49.5%, 0.6%-15.0%, 1.0%-18.1%, 0.7%-14.6% (ordinary magnesium hydroxide) at 1, 5, 10, and 15 mg·kg^-1 Cd treatments, respectively. The EX-Cd content of alkaline soil reached the lowest value on the 7th day of culture, and the EX-Cd content of acidic soil reached the lowest value on the 21st day under 1, 5, and 10 mg·kg^-1 Cd treatments. The content of EX-Cd in neutral, acidic, and alkaline soils decreased with the increase of magnesium hydroxide content, and the content of EX-Cd in soil decreased with the increase of magnesium hydroxide amount. At the same amount, the effect of passivating soil EX-Cd under nanometer magnesium hydroxide treatment was superior to ordinary magnesium hydroxide treatment.

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