石油烃降解物对Cd在土壤－植物系统中迁移转化影响的研究

Effect of degraded products from mineral oil on translocation and transformation of Cd In soil-plant system

研究棕榈酸、儿茶酚和香草酸对土壤中Ｃｄ行为的影响表明，土壤中儿茶酚对水稻的毒害浓度为１００ｍｇ·ｋｇ－１，而香草酸则为５００ｍｇ·ｋｇ－１．当土壤中儿茶酚为５０００ｍｇ·ｋｇ－１时，水稻籽实中Ｃｄ浓度降到０．００８ｍｇ·ｋｇ－１，土壤淋溶液中Ｃｄ浓度降为０．００５ｍｇ·Ｌ－１，３种有机物均能增加土壤中有机结合态Ｃｄ的比例，５０００ｍｇ·ｋｇ－１的儿茶酚处理，土壤中有机质结合态Ｃｄ占总Ｃｄ的４８．７１％．

Studies on the effect of palmitic acid, catechol and vanillic acid on behavior of Cd in soil show that the toxic concentration of catechol to rice plant is 100 mg·kg-1, and that of vanillic acid is 500 mg·kg-1. When the soil content of catechol is 5000 mg·kg-1, the concentration of Cd in rice grain is reduced to 0. 008 mg·kg-1,and that in leached solution from soil column is lowered to 0. 005 mg·L-1. All of these three organic compounds can increase the proportion of soil organic bound Cd,which occupies 48. 71% of total id when the soil is amended with 5000rug·kg-1 catechol.