论文部分内容阅读
采用平衡振荡法研究腐植酸对毒死蜱水解的影响和毒死蜱在腐植酸上的吸附特征及其影响因素。结果表明,在试验浓度范围内腐植酸可促进毒死蜱的水解,腐植酸浓度为120mg/L时,毒死蜱的水解速率常数k明显增大,为不加腐植酸时的2.53倍,腐植酸浓度增加毒死蜱的水解速率降低。毒死蜱在腐植酸上的吸附行为均可用Linear方程和Freundlich方程来描述,拟合效果均达到显著水平;试验条件下温度为15℃时毒死蜱在腐植酸上的吸附量最大,随温度的升高吸附量呈现出先降低后增大的趋势;pH值减小,腐植酸对毒死蜱的吸附能力增大;而离子强度对毒死蜱的吸附影响不明显;腐植酸添加量越大,吸附量越大,但单位质量的腐植酸吸附量越小。
The effect of humic acid on the chlorpyrifos hydrolysis and the adsorption characteristics of chlorpyrifos on humic acid and its influencing factors were studied by equilibrium oscillation method. The results showed that humic acid could promote the hydrolysis of chlorpyrifos in the concentration range of the test. When the concentration of humic acid was 120 mg / L, the hydrolysis rate constant k of chlorpyrifos increased obviously, which was 2.53 times higher than that without humic acid, and the concentration of humic acid increased chlorpyrifos The rate of hydrolysis decreases. The adsorption behavior of chlorpyrifos on humic acid can be described by the Linear equation and the Freundlich equation, and the fitting effect reaches a significant level. Under the experimental conditions, the adsorption amount of chlorpyrifos on humic acid is the largest at 15 ℃, and increases with the increase of temperature The amount of humic acid adsorbed on chlorpyrifos was not obvious; the greater the amount of humic acid added, the greater the amount of adsorption, but the unit The smaller the mass of humic acid adsorbed.