CAJ | 학술논문

选取三氯乙烯（TCE）、顺1，2二氯乙烯（cis 1，2 DCE）、1，1，1三氯乙烷（1，1，1 TCA）、1，2二氯乙烷（1，2 DCA）4种常见的有机氯代烃，通过批次实验研究其在壤土中的吸附和解吸特性。结果表明：4种有机氯代烃在壤土中的吸附平衡时间约为3 d ；在本文研究的整个浓度范围内，4种有机氯代烃的吸附等温线基本呈线性趋势，但更符合 Freundlich 模型。对于有机氯乙烯而言，TCE 在壤土中的吸附特性较为显著，线性分配系数 Kd 为0．624 L ／kg ，其次是 cis DCE ，Kd 为0．238 L ／kg ；对于有机氯乙烷而言，1，1，1 TCA 在壤土中的吸附特性较为显著，Kd 为0．520 L／kg ，其次是1，2 DCA ，Kd 为0．353 L ／kg 。这进一步表明4种有机氯代烃化合物在壤土中的吸附特性与化合物本身的疏水性有关。通过 Abdul 、Dobbs 、Rao 和 Cong 经验公式估算 lg Koc值发现，Abdul 估算所得 lg Koc比实测值偏小，Cong 估算 lg Koc比实测值偏大，Dobbs 和 Rao 与实测值更为接近；说明 Dobbs 和 Rao 经验公式更适用于预测有机氯代烃化合物在壤土的吸附特性。另外，研究发现有机氯代烃的解吸过程具有明显的滞后性，吸附特性较强的物质，其解吸较为缓慢。
선취삼록을희（TCE）、순1，2이록을희（cis 1，2 DCE）、1，1，1삼록을완（1，1，1 TCA）、1，2이록을완（1，2 DCA）4충상견적유궤록대경，통과비차실험연구기재양토중적흡부화해흡특성。결과표명：4충유궤록대경재양토중적흡부평형시간약위3 d ；재본문연구적정개농도범위내，4충유궤록대경적흡부등온선기본정선성추세，단경부합 Freundlich 모형。대우유궤록을희이언，TCE 재양토중적흡부특성교위현저，선성분배계수 Kd 위0．624 L ／kg ，기차시 cis DCE ，Kd 위0．238 L ／kg ；대우유궤록을완이언，1，1，1 TCA 재양토중적흡부특성교위현저，Kd 위0．520 L／kg ，기차시1，2 DCA ，Kd 위0．353 L ／kg 。저진일보표명4충유궤록대경화합물재양토중적흡부특성여화합물본신적소수성유관。통과 Abdul 、Dobbs 、Rao 화 Cong 경험공식고산 lg Koc치발현，Abdul 고산소득 lg Koc비실측치편소，Cong 고산 lg Koc비실측치편대，Dobbs 화 Rao 여실측치경위접근；설명 Dobbs 화 Rao 경험공식경괄용우예측유궤록대경화합물재양토적흡부특성。령외，연구발현유궤록대경적해흡과정구유명현적체후성，흡부특성교강적물질，기해흡교위완만。
The sorption and desorption characteristics of the four organic chlorinated hydrocarbons (trichloroethylene (TCE) ,cis 1 ,2 dichloroethylene (cis 1 ,2 DCE) ,1 ,1 ,1 trichloroethane (1 ,1 , 1 TCA ) , and 1 ,2 dichloroethane (1 ,2 DCA )) onto loam soil are investigated by a batch of experiments in this study .The results indicate that the sorption equilibrium time of the four chlorinated hydrocarbons onto the loam soil is about three days .The sorption isotherm for all compounds is nearly linear , and fits to Freundlich isotherm slightly over the entire concentration range . As for chloroethylenes ,TCE is strongly sorbed to the loam samples (Kd = 0 .624 L/kg) ,and followed by cis‐DCE (Kd = 0 .238 L/kg) .For chloroethanes ,1 ,1 ,1 TCA is strongly sorbed (Kd = 0 .520 L/kg) ,and followed by 1 ,2 DCA (Kd = 0 .353 L/kg) .This is consistent with the order of hydrophobicity of the compounds .In addition , the lg Koc value is estimated by Abdul , Dobbs , Rao and Cong empirical regression formula respectively in this study , and the results show that the estimated lg Koc value determined by Abdul regression is significantly lower than the calculated value ,and the estimated lgKoc value determined by Cong regression is significantly higher than the calculated value , while the estimated lg Koc values determined by Dobbs and Rao regression are much closer to the calculated values . This demonstrates that the Dobbs and Rao regression is more suitable for lg Koc estimation for chlorinated hydrocarbons .Besides ,it is found that there is a certain lag in desorption of chlorinated hydrocarbons from the loam soil ;and the higher the sorption capacity of chlorinated hydrocarbon ,the lower the desorption capacity of chlorinated hydrocarbon .