Removal of atrazine and four organophosphorus pesticides from environmental waters by diatomaceous earth–remediation method
irenejyli 添加于 2010-5-9 20:53
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作 者
Agdi K, Bouaid A, Esteban AM, Hernando PF, Azmani A, Camara C 摘 要
A new viable remediation technique based on the use of diatomaceous earth is proposed to improve the
ecological system. Its ability to remove atrazine and the four organophosphorus pesticides parathion-methyl,
chlorpyriphos, fenamiphos and methidathion from river and waste waters has been proven. A series of
experiments including variable conditions, such as temperature, pH, contact time, pesticide concentration and
adsorbent quantity, were performed to demonstrate the ef®ciency of pesticide removal from three different
water samples. The batch experiments showed that diatomaceous earth was able to remove 95% of
chlorpyriphos, 75% of methidathion and parathion-methyl and 55% of atrazine and fenamiphos from all types
of waters tested. The individual adsorption of each pesticide on diatomaceous earth could be described by the
Freundlich isotherm and a tentative adsorption mechanism was proposed. The Freundlich coef®cient (Kf) and
Freundlich constant (1/n) appeared to be closely related to the physicochemical properties (Kow, solubility) of
the compounds. The actual results support the conclusion that diatomaceous earth has the potential to serve as an extractant in remediation techniques.-
详细资料
- 文献种类:期刊
- 期刊名称: Journal of Environmental Monitoring
- 期刊缩写: J. Environ. Monitor.
- 期卷页: 第2卷 第5期 420-423页
- ISBN: 1464-0325
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Removal of atrazine and four organophosphorus pesticides from environmental waters by diatomaceous earth–remediation method
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