摘要
研究了γ 6 6 6在有机碳含量分别为 <0 0 8% ,0 40 %± 0 0 6 %和 1 0 0 %± 0 2 8%而铁含量依次增加的三组土样中的光解动力学 ,γ 6 6 6的光解符合准一级动力学方程 .当土样中的铁含量相对不变时 ,γ 6 6 6的光降解动力学常数与有机质含量成负相关 ;而当土样中的有机碳含量相对不变时 ,光解动力学常数与铁含量成线性正相关 .为进一步验证土壤有机质对γ 6 6 6的光解的作用 ,采用土壤化学逐级分离法将一土样中的碳酸钙和有机质逐一去除而得到一级和二级土样 ,发现γ 6 6 6在这两级土样中的光解动力学常数依次为 0 0 12 9h-1和 0 0 2 31h-1,再次证明土壤有机质对γ 6 6
The photodegradation kinetics of γ 666 on natural surface soils was studied by 15 kinds of natural soils with different contents of organic matter and total iron. The photodegradation rates of γ 666 on these soils follow the first\|order reaction model. From the pseudo first order photodegradation kinetic constants of γ 666, it was found that photodegradation rates of γ 666 are declined with the increasing contents of soil organic carbons when the total iron concentrations in the soils remain constant; while enhanced with the increasing of iron contents on the condition that soil organic matters are kept relatively constantly. In addition, the carbonate and soil organic matters were removed from one original soil by the chemical sequential separation method and got two grade of soils. The photodegradation constants on these two grades are 0.0129?h -1 and 0 0231?h -1 respectively. The result proved again that soil organic matter inhibits photodegradation of γ 666 remarkably.
出处
《环境科学学报》
CAS
CSCD
北大核心
2002年第1期80-85,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目 (项目编号 :2 99770 0 3)
教育部重点基金资助项目 (项目编号 :0 0 0 2 8)
