农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2014年
5期
943-950
,共8页
乔肖翠%何江涛%杨蕾%邹合萍
喬肖翠%何江濤%楊蕾%鄒閤萍
교초취%하강도%양뢰%추합평
再生水灌溉%多环芳烃%溶解性有机质(DOM)%pH
再生水灌溉%多環芳烴%溶解性有機質(DOM)%pH
재생수관개%다배방경%용해성유궤질(DOM)%pH
reclaimed water irrigation%polycyclic aromatic hydrocarbons(PAHs)%dissolved organic matter(DOM)%pH
影响多环芳烃(PAHs)在土壤中垂向迁移的因素很多,通过柱实验模拟研究了溶解性有机质(DOM)浓度及pH对多环芳烃在土壤中迁移及转化的影响,以氯离子做示踪剂进行校正,探讨了不同浓度DOM及pH对多环芳烃迁移的影响。结果表明,校正后的多环芳烃迁移速率随着DOM浓度增加呈逐渐增大趋势,与空白柱对照可得低浓度的DOM由于累积吸附与共吸附作用对多环芳烃的迁移起抑制作用,随着DOM浓度增加,抑制作用逐渐减弱,当浓度达到一定程度时,DOM形成表面活性剂胶体束,多环芳烃进入胶体束内部,从而迁移速率加快。当pH为6、8、10时多环芳烃的迁移速率与空白柱相比均较大,且pH为8、10时多环芳烃迁移速率大于pH为6时的迁移速率,由此可见pH会影响多环芳烃迁移速率,其原因为pH的改变会影响DOM所带电荷的电性,当pH升高到中性或碱性时由于空间排斥理论,DOM的迁移会加快,从而影响多环芳烃的迁移速率。
影響多環芳烴(PAHs)在土壤中垂嚮遷移的因素很多,通過柱實驗模擬研究瞭溶解性有機質(DOM)濃度及pH對多環芳烴在土壤中遷移及轉化的影響,以氯離子做示蹤劑進行校正,探討瞭不同濃度DOM及pH對多環芳烴遷移的影響。結果錶明,校正後的多環芳烴遷移速率隨著DOM濃度增加呈逐漸增大趨勢,與空白柱對照可得低濃度的DOM由于纍積吸附與共吸附作用對多環芳烴的遷移起抑製作用,隨著DOM濃度增加,抑製作用逐漸減弱,噹濃度達到一定程度時,DOM形成錶麵活性劑膠體束,多環芳烴進入膠體束內部,從而遷移速率加快。噹pH為6、8、10時多環芳烴的遷移速率與空白柱相比均較大,且pH為8、10時多環芳烴遷移速率大于pH為6時的遷移速率,由此可見pH會影響多環芳烴遷移速率,其原因為pH的改變會影響DOM所帶電荷的電性,噹pH升高到中性或堿性時由于空間排斥理論,DOM的遷移會加快,從而影響多環芳烴的遷移速率。
영향다배방경(PAHs)재토양중수향천이적인소흔다,통과주실험모의연구료용해성유궤질(DOM)농도급pH대다배방경재토양중천이급전화적영향,이록리자주시종제진행교정,탐토료불동농도DOM급pH대다배방경천이적영향。결과표명,교정후적다배방경천이속솔수착DOM농도증가정축점증대추세,여공백주대조가득저농도적DOM유우루적흡부여공흡부작용대다배방경적천이기억제작용,수착DOM농도증가,억제작용축점감약,당농도체도일정정도시,DOM형성표면활성제효체속,다배방경진입효체속내부,종이천이속솔가쾌。당pH위6、8、10시다배방경적천이속솔여공백주상비균교대,차pH위8、10시다배방경천이속솔대우pH위6시적천이속솔,유차가견pH회영향다배방경천이속솔,기원인위pH적개변회영향DOM소대전하적전성,당pH승고도중성혹감성시유우공간배척이론,DOM적천이회가쾌,종이영향다배방경적천이속솔。
Vertical migrations of polycyclic aromatic hydrocarbons(PAHs)in soils are influenced by many factors. In a simulated experiment, vertical migrations of PAHs in soil columns were investigated at different levels of DOM and pH. Chloride ion(Cl-)was used to correct the migration rates of PAHs. The migration rates of PAHs were influenced by DOM concentrations. At low concentrations, DOM restrained the vertical migrations of PAHs, due to its cumulative adsorption and co-adsorption. At high concentrations, however, DOM formed surfactant colloids, and the PAHs could enter the colloids, leading to increased migrations. The migrations of PAHs in the columns increased with in-creasing pH values, due to promoted electrostatic exclusion from more charges of DOM from the dissociation at higher pH.