四川环境
四川環境
사천배경
2012年
5期
16-20
,共5页
苄嘧磺隆%芘%土壤%吸附%解吸
芐嘧磺隆%芘%土壤%吸附%解吸
변밀광륭%비%토양%흡부%해흡
Bensulfuron-methyl%Pyrene%soil%sorption%desorption
吸附是外源有机污染进入土壤后首先发生的最重要的过程，直接影响着有机物的生物可利用性。采用完全混合法研究了苄嘧磺隆和芘在土壤中的吸附一解吸动力学特征以及等温吸附解吸行为。结果表明，（1）苄嘧磺隆和芘在土壤中的吸附-解吸动力学过程存在两段行为，即初期快速反应阶段和经过一段时间后的慢速阶段，动力学特征表明供试有机物8h内能达到吸附-解吸平衡；（2）在试验浓度范围内，线性方程能很好地描述苄嘧磺隆和芘在土壤中的吸附解吸行为；（3）苄嘧磺隆和芘在土壤中存在解吸迟滞现象，解吸并不完全是吸附的可逆过程，土壤中存在不可逆吸附室是造成解吸滞后的主要原因。
吸附是外源有機汙染進入土壤後首先髮生的最重要的過程，直接影響著有機物的生物可利用性。採用完全混閤法研究瞭芐嘧磺隆和芘在土壤中的吸附一解吸動力學特徵以及等溫吸附解吸行為。結果錶明，（1）芐嘧磺隆和芘在土壤中的吸附-解吸動力學過程存在兩段行為，即初期快速反應階段和經過一段時間後的慢速階段，動力學特徵錶明供試有機物8h內能達到吸附-解吸平衡；（2）在試驗濃度範圍內，線性方程能很好地描述芐嘧磺隆和芘在土壤中的吸附解吸行為；（3）芐嘧磺隆和芘在土壤中存在解吸遲滯現象，解吸併不完全是吸附的可逆過程，土壤中存在不可逆吸附室是造成解吸滯後的主要原因。
흡부시외원유궤오염진입토양후수선발생적최중요적과정，직접영향착유궤물적생물가이용성。채용완전혼합법연구료변밀광륭화비재토양중적흡부일해흡동역학특정이급등온흡부해흡행위。결과표명，（1）변밀광륭화비재토양중적흡부-해흡동역학과정존재량단행위，즉초기쾌속반응계단화경과일단시간후적만속계단，동역학특정표명공시유궤물8h내능체도흡부-해흡평형；（2）재시험농도범위내，선성방정능흔호지묘술변밀광륭화비재토양중적흡부해흡행위；（3）변밀광륭화비재토양중존재해흡지체현상，해흡병불완전시흡부적가역과정，토양중존재불가역흡부실시조성해흡체후적주요원인。
Adsorption is the initial process when the exterior organic pollutants enter the soil, which influences directly the bioavailability of organics in soil The sorption-desorption behavior and its kinetics of Bensulfuron-methyl ( BSM ) and Pyrene (PYR) in soil as well as the isothermal sorption and desorption behavior were studied using completely mixing method. The results showed that : ( 1 ) the sorption-desorption kinetics of BSM and PYR in soil included two phases, a speed reaction phase initially and a slow reaction phase followed. The kinetics showed that the testing organics could reach the sorption-desorption equilibrium in eight hours. (2) Within the testing concentration range, the linear equation described well the sorption-desorption behavior of BSM and PYR in soil (3) There was a phenomenon of desorption delaying for BSM and PYR in soil, the sorpfion is not a complete reversible process of desorption. The existence of irreversible sorption room in soil was the major cause of desorption delaying.
