全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

悬浮底泥六氯苯吸附-解吸行为研究

Keywords: 六氯苯,悬浮底泥,吸附-解吸,大沽排污河

Full-Text   Cite this paper   Add to My Lib

Abstract:

为调查河流系统中六氯苯(HCB)在悬浮底泥与水体间的迁移规律,采集大沽排污河12个站位的表层沉积物样品进行吸附-解吸规律的研究。首先进行了沉积物中HCB解吸释放实验研究,结果表明:HCB释放规律符合快、慢2段1级动力学模型,快速和慢速释放部分所占的质量分率f1,f2分别为34.1%和65.9%;快速和慢速释放速率常数k1d,k2d分别为0.1253h-1和8.0×10-4h-1。进而,根据HCB解吸规律建立了水系中污染物在悬浮底泥与水体间的吸附-解吸动力学模型,经过吸附-解吸动力学分析,揭示出HCB在不同环境介质间的迁移过程。悬浮颗粒物浓度是HCB吸附-解吸时间响应的重要影响因素。悬浮底泥浓度为0.05g·L-1时,500h水体中溶解相HCB浓度仍在增大,而悬浮底泥浓度为2.5g·L-1时,10h后各相浓度变化就已经不明显。模型分析结果可解释许多文献报道同一种有机污染物吸附-解吸平衡时间从几小时到几个月的巨大差异。

References

[1]  Wu S C,Gachwend D M.Sorption kinetics of hydrophobic organic com-pounds to natural sediments and soil[J].Environ Sci Technvl,1986,20 (7):717-725.
[2]  Wauchope R D,Myers R S.Adsorption-desorption kinetics of Atrozine and Linuron in freshwater-sediment aqueous slurries[J].Environ Qual,1985,14(1):132-136.
[3]  Bouchard D C,Lavy T L.Hexazinone edsorption-desorption studies with soil and organic adsorption[J].Environ Qual,1985,14(2):181-186.
[4]  Rogers R D,Mcfaland J C,Cross A J.Adsorption and desorption of ben-zene in two soils and montmofillonite clay[J].Environ Sci Technol,1980,14(4):457-460.
[5]  Pignatello J J,Xing B.Mechanisms of slow sorption of organic chemicals to natural particles[J].Environ Sci Technol,1996,30:1-11.
[6]  Pignatello J J,Huang L Q.Degradation of polychlorinated dibanzo-p-dioxin and dibenzofuran contaminants in 2,4,5,-T by photoassiated iron catalyzed hydrogen peroxide[J].Water Research,1993,27 (12):1731-1736.
[7]  Ball W P,Roberts P V.Long-term sorption of halagenated organic chemicals by aquifer material:1.Intraparticle diffusion[J].Environ Sci Technol,1991,25(7):1237-1249.
[8]  Bruseeau M L,Rao P S C.Sorption kinetics of organic chemicals.Meth-ods,models and mechanisms[J].Soil Science Society of America,1991,27(2):281-302.
[9]  丁辉,李鑫钢,徐世民,等.大沽排污河内持久性有机氯农药的检测[J].天津大学学报,2007,40(6):671-676.DING Hui,LI Xin-gang,XU Shi-min,et al.Study on dcsorption of HCB in sediments from Dagu Drainage River[J].Journal of Tionjin University,2007,40 (6):671-676 (in Chinese).
[10]  Hulscber T ten,Vfind B A,et al.Resistant sorption of in situ chloroben-zenes and a polychlorinated biphenyl in river Rhine suspended matter[J].Chemosphere,2002,49(10):1231-1238.
[11]  Hulscber T ten,Vrind B,Heuvel,et al.Triphasic desorption of highly resistant chlorobenzenes,polychlorinated hipbenyls,and polycyclic aromatic hydrocarbons in field contaminated sediment[J].Environ Sci Technol,1999,33:126-132.
[12]  Kan A T,Cben W,Tomson M B.Desorptian kinetics of neutral hy-drophohic organic compounds from field-contaminated sediment[J].Environ Pollution,2000,108:81-89.
[13]  Cornelissen G,Van Noort P C M,Parsons J R,et al.Temperature de-pendence of slow adsorption and desorption kinetics of organic com-pounds in sediments[J].Environ Sci Technvl,1997,31:454-460

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133