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...

三氯乙烯和三氯苯在水-玉米-空气系统中的传输过程研究

Keywords: 木质部伤流液,有机污染物,传输,水-玉米-空气体系

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用水培实验及光照培养箱培养方法,通过测量玉米木质部伤流液及露珠中三氯乙烯(TCE)和1,2,3-三氯苯(TCB)两种有机污染物的浓度,对比探讨了两种有机污染物在水-玉米-空气系统中的传输过程和机制。结果表明,露珠中TCE与TCB均主要来源于随水蒸气的叶面挥发过程;水培条件下TCB在玉米木质部伤流液中的浓度与根外部水溶液中TCB浓度呈正相关,而露珠中TCB浓度与外部水溶液浓度呈负相关,蒸腾流浓缩系数(TSCF)值由暴露时间决定。实验条件下,根外部溶液浓度较低时,露珠中TCB浓度远大于木质部伤流液中TCB浓度;而高浓度时,木质部伤流液中TCB浓度远大于露珠中浓度。露珠中TCE浓度远大于木质部伤流液中TCE浓度,且与根外部水溶液浓度呈正相关;而木质部伤流液中TCE浓度随营养液中TCE浓度增加而减小。

References

[1]  Su Y H,Zhu Y G,Transport mechanisms for the uptake of organic compounds by rice(Oryza saliva) roots,Environmental Pollution,2007.
[2]  Barber J L,Kurt P B,Thomas G O,Investigation into the importance of the stomatal pathway in the exchange of PCBs between air and plants,Environmental Science and Technology,2002.
[3]  Wild E,Dent J,Thomas G O,Visualizing the air-to-leaf transfer and within -leaf movement and distribution of phenanthrene:Further studies utilizing two-photon excitation microscopy,Environmental Science and Technology,2006.
[4]  Schroll R,Bierling B,Cao G,Uptake pathways of organic chemicals from soil by agricultural plants,Chemosphere,1994.
[5]  Shone M G T,Wood A V,Uptake and translocation of herbicides,Journal of Experimental Botany,1974.
[6]  Su Y H,Liang Y C,Zhu Y G,Interactions of mixed organic contaminants in uptake by rice seedlings,Chemosphere,2009.
[7]  Su Y H,McGrath S P,Zhao F J,Rice is more efficient in arsenite uptake and translocation than wheat and barley (Online),Plant and Soil,2009.
[8]  Tao S,Cui Y H,Xu F L,Polycyclic aromatic hydrocarbons(PAHs) in agricultural soil and vegetables from Tianjin,Science of the Total Environment,2004.
[9]  B(o)hme F,Welsch -Pausch K,Mclachlan M S,Uptake of airborne semivolatile organic compounds in agricultural plants:Field measurements of interspecies variability,Environmental Toxicology and Chemistry,1999.
[10]  Simonich S L,Hites R A,Organic pollution accumulation in vegetation,Environmental Science and Technology,1995.
[11]  Gao Y Z,Zhu L Z,Plant uptake,accumulation and Iranslooalion of pheanthrene and pyrene in soils,Chemosphere,2004(9).
[12]  王晓蓉,环境化学,南京:南京大学出版社,1997.
[13]  Briggs G G,Bromilow R H,Evans A A,Relationship between lipophilic-ity and root uptake and translocation of non-ionised chemicals by barley,Pesticide Science,1982.
[14]  Li H,Sheng G Y,Sheng W T,Uptake of trifluralin and lindane from water by ryegrass,Chemosphere,2002.
[15]  Li H,Sheng G Y,Chiou C T,Relation of organic contaminant equilibrium sorption and kinetic uptake in plants,Environmental Science and Technology,2005.
[16]  Barbour J P,Smith J A,Chiou C T,Sorption of aromatic organic pollutants to grasses from water,Environmental Science and Technology,2005.
[17]  McLachlan M S,Bioaccumulation of hydrophobic chemicals in agricultural food chains,Environmental Science and Technology,1996.
[18]  Chiou C T,Sheng G Y,Manes M,A partition-limited model for the plant uptake of organic contaminants from soil and water,Environmental Science and Technology,2001.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133