共存有机物对毒死蜱在沉积物上吸附的影响

用批量平衡法研究了共存有机物对毒死蜱在沉积物上吸附行为的影响.结果表明,苯酚和芘对毒死蜱在沉积物上的吸附有竞争作用,其中苯酚的竞争能力较大.多种有机污染物共存时,毒死蜱在沉积物上的吸附仍然由分配作用决定.表面活性剂的浓度小于临界胶束浓度(CMC)时,十二烷基硫酸钠(SDS)能明显降低毒死蜱在沉积物上的吸附量,降低程度与SDS浓度呈负相关,而非离子表面活性剂Triton X-100能增加毒死蜱在沉积物上的吸附量,增加程度与Triton X-100浓度呈正相关.

Effects of coexisted organic compounds on sorption of chlorpyrifos to sediments

The effects of coexisted organic compounds on sorption behavior of chlorpyrifos to sediments were studied. There existed competitive sorption of phenol and pyrene against chlorpyrifos on sediments in which phenol had greater competitive power. In the coexistence of varied organic pollutants, partition action decided yet the sorption of chlorpyrifos sorption to sediments. The sodium dodecyl sulphate (SDS, an anion surfactant) could reduce markedly the sorption amount of chlorpyrifos to sediments with their negative relation; while the Triton X-100 (an nonionic surfactant) could enhance the sorption amount with positive relation when their concentrations were lower than the critical micelle concentration (CMC).