Chemodynamics of methyl parathion and ethyl parathion: adsorption models for sustainable agriculture.
Chemodynamics of methyl parathion and ethyl parathion: adsorption models for sustainable agriculture.
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DOI：
10.1155/2014/831989
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发表时间：
2014
影响因子：
--
通讯作者：
Ashraf MA
中科院分区：
文献类型：
--
作者：
Tabassum N;Rafique U;Balkhair KS;Ashraf MA
有机磷杀虫剂对非靶标生物的毒性一直是可持续农业广泛研究的主题。巴基斯坦已经禁止使用甲基/乙基对硫磷，但它们仍被非法使用。本研究试图估算不同类型土壤的吸附残留量，并提出补救方案，收集并表征土壤的理化参数。农药在土壤或其他多孔介质中的吸附是调节农药迁移和降解的重要过程。分别在276 nm和277 nm处用紫外-可见分光光度计测甲基对硫磷和乙基对硫磷的去除百分率。结果表明，在pH值为7的最佳分批条件下，农田土壤比荒地土壤对两种杀虫剂的吸附效果更好，12h内达到吸附平衡。甲基对硫磷的脱除效率比乙基对硫磷高7个数量级。这可能归因于甲基对硫磷具有更多的结合部位和较少的空间位阻。吸附动力学研究表明，土壤有机碳与分配系数Kd之间存在较好的相关性。由于结合残基或陈化残基的形成，随着诱导浓度的增加，Kd普遍增加。
The toxicity of organophosphate insecticides for nontarget organism has been the subject of extensive research for sustainable agriculture. Pakistan has banned the use of methyl/ethyl parathions, but they are still illegally used. The present study is an attempt to estimate the residual concentration and to suggest remedial solution of adsorption by different types of soils collected and characterized for physicochemical parameters. Sorption of pesticides in soil or other porous media is an important process regulating pesticide transport and degradation. The percentage removal of methyl parathion and ethyl parathion was determined through UV-Visible spectrophotometer at 276 nm and 277 nm, respectively. The results indicate that agricultural soil as compared to barren soil is more efficient adsorbent for both insecticides, at optimum batch condition of pH 7. The equilibrium between adsorbate and adsorbent was attained in 12 hours. Methyl parathion is removed more efficiently (by seven orders of magnitude) than ethyl parathion. It may be attributed to more available binding sites and less steric hindrance of methyl parathion. Adsorption kinetics indicates that a good correlation exists between distribution coefficient (Kd) and soil organic carbon. A general increase in Kd is noted with increase in induced concentration due to the formation of bound or aged residue.
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影响因子：
4
作者：
BUTLER, LC;STAIFF, DC;DAVIS, JE
通讯作者：
DAVIS, JE
影响因子：
6.1
作者：
Nousiainen, Marjaana;Perakorpi, Kaleva;Sillanpaa, Mika
通讯作者：
Sillanpaa, Mika
DOI：
10.1021/i160018a011
发表时间：
1966-01-01
期刊：
INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS
影响因子：
--
作者：
HALL, KR;EAGLETON, LC;VERMEULEN, T
通讯作者：
VERMEULEN, T
影响因子：
2.7
作者：
JACKSON, MD;LEWIS, RG
通讯作者：
LEWIS, RG
DOI：
10.1061/(asce)0733-9372(1988)114:3(689
发表时间：
1988-06-01
影响因子：
2.2
作者：
MCLEAN, JE;SIMS, RC;GRENNEY, WJ
通讯作者：
GRENNEY, WJ