四川环境
四川環境
사천배경
2012年
6期
16-21
,共6页
乌梁素海%沉积物%吸附-解吸%吸附能力
烏樑素海%沉積物%吸附-解吸%吸附能力
오량소해%침적물%흡부-해흡%흡부능력
Lake Wuliangsuhai%sediments%adsorption-desorption%adsorb ability
吸附-解吸是重金属在沉积物中迁移转化的重要过程。本文研究干旱半干旱地区湖泊——鸟梁素海不同区域沉积物对Cu2＋的吸附一解吸过程。结果表明，吸附过程中，pH值逐渐降低；沉积物TOE含量越高，其对Cu2＋的吸附能力也越强；生活污水和工业废水影响的S1样点及受农田退水影响的S2样点对Cu2＋的吸附量相对较低，而相对较洁净的S3和S4样点具有较高的Cu2＋吸附量。4个样点吸附量能力大小为s3〉s4〉s2〉S1。解吸实验显示，沉积物吸附的Cu2＋大部分都不能被解吸。试验结果符合Langmuir和Freundlich等温吸附方程，Langrauir方程的拟合效果要好于Freundlieh方程，Langmuir方程拟合的饱和吸附量分别为3．31mg／g、4．84mg／g、8．39mg／g和7．75mg／g。
吸附-解吸是重金屬在沉積物中遷移轉化的重要過程。本文研究榦旱半榦旱地區湖泊——鳥樑素海不同區域沉積物對Cu2＋的吸附一解吸過程。結果錶明，吸附過程中，pH值逐漸降低；沉積物TOE含量越高，其對Cu2＋的吸附能力也越彊；生活汙水和工業廢水影響的S1樣點及受農田退水影響的S2樣點對Cu2＋的吸附量相對較低，而相對較潔淨的S3和S4樣點具有較高的Cu2＋吸附量。4箇樣點吸附量能力大小為s3〉s4〉s2〉S1。解吸實驗顯示，沉積物吸附的Cu2＋大部分都不能被解吸。試驗結果符閤Langmuir和Freundlich等溫吸附方程，Langrauir方程的擬閤效果要好于Freundlieh方程，Langmuir方程擬閤的飽和吸附量分彆為3．31mg／g、4．84mg／g、8．39mg／g和7．75mg／g。
흡부-해흡시중금속재침적물중천이전화적중요과정。본문연구간한반간한지구호박——조량소해불동구역침적물대Cu2＋적흡부일해흡과정。결과표명，흡부과정중，pH치축점강저；침적물TOE함량월고，기대Cu2＋적흡부능력야월강；생활오수화공업폐수영향적S1양점급수농전퇴수영향적S2양점대Cu2＋적흡부량상대교저，이상대교길정적S3화S4양점구유교고적Cu2＋흡부량。4개양점흡부량능력대소위s3〉s4〉s2〉S1。해흡실험현시，침적물흡부적Cu2＋대부분도불능피해흡。시험결과부합Langmuir화Freundlich등온흡부방정，Langrauir방정적의합효과요호우Freundlieh방정，Langmuir방정의합적포화흡부량분별위3．31mg／g、4．84mg／g、8．39mg／g화7．75mg／g。
Adsorption-desorption are important processes of heavy metals during their migration and conversion in sediments. This work researched the adsorption-desorption processes of Cu2+ in different sediment samples collected from Lake Wuliangsuhai where locates in arid and semi-arid region. The result showed that pH value decreased during Cu2+ adsorption; the higher the TOC content in sediments, the stronger the Cu2+ adsorption; the Cu2+ adsorption capacity of sampling site S1 influenced by domestic sewage and industrial wastewater and S2 influenced by the drainage from farmlands were relatively low; at the site S3 and S4 where are rdatively dean showed higher adsorption capacity of Cu2+. The adsorptive capacity of Cu2 + ranked as S+ 〉 S4 〉 S2 〉 S1. Desorption experiments showed that most of the Cu2+adsorbed by the sediment could not be desorbed. The data obtained in this study were fitted using Freundlich and Langmuir isothermal adsorption equations, of which the effect of Langmuir equation showed better than the Freundlich equation. The calculated saturation adsorptions using the Langmuir equation were 3.31, 4.84, 8.39 and 7.75 mg/g for the site S1, S2, S3 and S4 respectively.
