颗粒物对乐果的吸附特征--《农业环境科学学报》2011年01期

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颗粒物对乐果的吸附特征

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杨宏伟 庄晓娟

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~xl1{;Bw|B g0【摘要】:研究了颗粒物(内蒙古土壤Y2、Y3、Y4和黄河水体表层沉积物Y1)对有机磷农药乐果的吸附规律,观察了颗粒物的性质如有机质、粘粒、CEC(阳离子交换量)和离子强度等因素对吸附行为的影响。结果表明,内蒙古4种颗粒物对乐果的吸附过程可用Freundlich等温式描述,吸附常数在1.4848~1.9550mL·g-1之间;影响颗粒物对乐果吸附的主要因素是CEC、离子强度和有机质,颗粒物对乐果的吸附量与颗粒物的CEC有着极显著的正相关关系,相关系数为0.9812,P0.01;随着离子强度的降低,4种颗粒物对乐果的吸附量增大;除黄河水体表层沉积物Y1外,颗粒物的有机质含量越高,对乐果的吸附能力就越强。

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【作者单位】:

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内蒙古师范大学化学与环境科学学院;水利论文{\q0Q u

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【关键词】:

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乐果 吸附 颗粒物水利论文!{3PmwiDo4S*H

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【基金】:国家自然科学基金资助项目(20467002)水利论文 gr*|H9qf

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【分类号】:X592水利论文9`$m wo P4R*Yx

Q-Kd N+fLA ON0【正文快照】:水利论文/yP4C}$X_o

E_uD:AZ"MCMK0由于有机磷农药的残留性、生物富集性,导致使用过该类农药的土壤和农作物中有残留,并且通过地表径流污染水环境[1-4]。有机磷农药乐果[O,O-二甲基-S-(N-甲胺基甲酰甲基)]二硫代磷酸酯,S‖CH3NHCOCH2SP(OCH3)2是一种低毒、高效、广谱的杀虫剂[5],广泛用于果树、茶树、油料、棉水利论文^_UHdh2u)m

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