• 关键词：生物降解  2, 4－D  吸附影响  土壤

• 基金项目：

• 范成新
• 中国科学院南京地理与湖泊研究所, 210008

• 邹惠仙
• 南京大学环境科学系

• 许鸥泳
• 南京大学环境科学系

• 摘要：提出一个吸附对有机物生物降解影响的数学模型。模型中考虑了有吸附剂存在下体系可能出现的四种降解类型。用从土壤中分离出的2, 4-D降解菌株, 在有土壤或沉积物存在下与2, 4-D进行生物降解实验。在菌体浓度不变的情况下, 估算和比较了30℃时四种降解作用的速率常数。结果表明, 吸附的2, 4-D不被水中和吸附的细菌所利用；而水中的2, 4-D则可被水中和吸附的细菌所降解。进一步分析认为, 并非所有生物降解都受到吸附阻碍, 一定条件下吸附可加快生物降解作用的进行。

• Abstract：A mathematics model was proposed to describe the effects of adsorptionof soil(sediment)on organic biodegradation rates of 2, 4-D.Four kinds ofchemical-bacteria interactions have been considered:(1)bacteria in waterreacting with chemicals in water;(2)bacteria in water reacting withadsorbed chemicals;(3)adsorbed bacteria reacting with chemicals in waterand(4)adsorbed bacteria reacting with adsorbed chemicals. The degradingbacteria strain(pseudomonas sp.)was isolated from soil and adapted with2, 4-D.Bacteria sorption on soil(sediment)was determined with the bacterialabeled P³².The results showed that 2, 4-D adsorbed on soil(sediment)wasavailable neither to the bacteria in water nor to the bacteria on soil(sedi-ment).It could be drawn from the model that biodegradation is not bound tobe inhibited in the presence of adsorbent and it can be stimulated under cer-tain conditions.

• Key words：biological degradation  adsorption  soil  2, 4-D.

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