土壤胡敏酸质量分数对TNT吸附-解吸的影响

研究了TNT在去有机质茶园土、茶园土原土、胡敏酸质量分数2%茶园土和胡敏酸质量分数5%茶园土共4种土壤上的吸附动理学以及吸附-解吸行为。动理学实验表明,胡敏酸质量分数越高,土壤吸附的TNT越多,快吸附和慢吸附区分越明显,吸附达到饱和状态所需的时间越长。吸附-解吸实验表明,TNT在土壤上的吸附-解吸特性与土壤胡敏酸质量分数有关:胡敏酸质量分数越高,土壤吸附TNT的能力越强,解吸能力越弱,解吸滞后性越显著。4种土壤的胡敏酸质量分数顺序由大至小为胡敏酸质量分数5%茶园土、胡敏酸质量分数2%茶园土、茶园土原土、去有机质茶园土;土壤吸附TNT能力和TNT解吸滞后性皆与此顺序一致,而TNT解吸能力则与此顺序相反。

Effect of Mass Fraction of Humic Acid in Soil on Absorption-desorption of TNT

The adsorption kinetics and absorption-desorption of TNT in four kinds of soil with tea garden soil of 5% （mass fraction） HA, tea garden soil of 2% （mass fraction） HA, origin tea garden soil, and inorganic tea garden soil were researched in the paper. Kinetic experiments indicated that the higher HA content was, the higher quantity of soil absorption TNT was, the more obvi-ous fast adsorption and slow absorption was, the longer time of absorption lasted to reach a saturated duration. Absorption-desorp- tion experiments suggested that the absorption-desorption of TNT in the soil was related to HA content. With increasing HA content, absorption capability of TNT on soil was enhanced and the desorption eapabililLy was decreased, and desorption hysteresis was also enhanced. The sequence of four kinds of soil with different HA content decreased was： tea garden soil of 5% HA, tea garden soil of 2% HA, origin tea garden soil, and inorganic tea garden soil. The order of TNT absorption and desorption hysteresis ware consistent with that of the above HA content, which reversed that of desorption capability.