Effects of Complexes of Alga Polysaccharide with Rare Earth on Degradation of Organophosphorous Pesticide Residues in Vegetables
海藻多糖稀土配合物对蔬菜有机磷农药残留的降解作用

Effects of complexes of alga polysaccharide with rare earth on degradation of organophosphorus pesticides residues in pakchoi, cabbage and celery were investigated. Results showed that degradation effects of complexes of alga polysaccharide with rare earth on chlorpyrifos, omethoate and dichlorvos in pakchoi, cabbage and celery were very obvious. Degradation effects on chlorpyrifos and omethoate in cabbage were superior to that in pakchoi, and degradation effect on chlorpyrifos in celery was not so good as that in cabbage and pakchoi, by spraying complexes of alga polysaccharide with rare earth. Degradation effect of complexes of alga polysaccharide with rare earth on dichlorvos, as organophosphorus insecticide of phosphorus acid ester, was intense than those on chlorpyrifos and omethoate, as organophosphorus insecticide of thiophosphorus acid ester. Therefore it was indicative of definite selectivity for organophosphorus insecticide. In addition, water spray could wash out pesticide remained in blade surface, and reduce residue in vegetables. The degradation rate of complexes of alga polysaccharide with rare earth on organic phosphorus pesticide in cabbage and pakchoi outclassed that by spraying water. It was proved that complexes of alga polysaccharide with rare earth could degrade pesticide residue effectively.