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采用大田实验研究复合污染土壤中添加组配改良剂FQ12(沸石∶羟基磷灰石=1∶2)对受污染土壤和蔬菜中Pb、Cd、Cu、Zn 4种重金属的影响。结果表明,在添加FQ12后,土壤中重金属交换态含量大幅降低。辣椒可食部位中Pb、Cd、Cu、Zn含量也显著降低,FQ12添加量8.0g/kg时降低效果最好,Pb、Cd、Cu分别降低91.1%,58.3%,95.3%;Zn则是在4.0g/kg时,最大降幅达到89.4%,其他部位也有不同程度降低。在添加FQ12后,在一定程度上可以降低空心菜可食部位中Pb、Cd、Cu、Zn含量。在添加量为8.0g/kg时,4种重金属总量均达到最大降幅,最为明显的是Pb和Cu分别降低55.9%和50.7%,根部各重金属含量变化不大。由此可知,FQ12的施用对2种蔬菜吸收土壤重金属起到有效的抑制作用。
Field experiment was conducted to study the effect of FQ12 (zeolite: hydroxyapatite = 1: 2) on Pb, Cd, Cu and Zn in heavy metals contaminated soils. The results showed that after addition of FQ12, the exchangeable content of heavy metals in soil decreased significantly. The contents of Pb, Cd, Cu and Zn in edible parts of pepper also decreased significantly, and the best reducing effect was obtained when the dosage of FQ12 was 8.0g / kg, while the contents of Pb, Cd and Cu were reduced by 91.1%, 58.3% and 95.3% 4.0g / kg, the maximum decline of 89.4%, other parts also have different degrees of reduction. After adding FQ12, Pb, Cd, Cu, Zn contents in the edible parts of the canopy can be reduced to a certain extent. At the dosage of 8.0g / kg, the total amount of four kinds of heavy metals reached the maximum decline, the most obvious was that Pb and Cu decreased by 55.9% and 50.7%, respectively, and the contents of heavy metals in roots did not change much. Thus, FQ12 application of 2 kinds of vegetables to absorb soil heavy metals play an effective inhibitory effect.