久效磷在环境中的行为与归趋

运用同位素示踪技术研究了久效磷在农业生态环境中的行为。结果表明,久效磷进入生态环境后将降解为可溶态和结合态残留物;土壤微生物能显著地加速久效磷的降解与消失;在水灌农作物及水生生态系中,久效磷在水中消失较快,易被系统内动植物吸收;久效磷用于水稻,一次喷药0.45kg/hm~2,间隔31天,糙米中的残留浓度低于最大残留限量,若二次、三次用药,则安全间隔期为52天和67天。久效磷在所论各系统中的可溶态降解物主要为磷酸三酯。

The behaviour and fate of monocrotophos in the environment.

The technique of the isotope tracer was applied to investigate the behaviour of monocrotophos in the agroecological environment. The results showed that the monocrotophos will degrad to soluble and bound residues after getting into the ecological envronment. The soil microbes could quicken the degradation and disappearance of monocrotophos markedly. In the irrigated crops and aquatic ecosystem, the monocrotophos disappeared rather rapidly in the water, and it could be easily absorbed by animal and plant in the system. When the dosage of appiled monocrotophos was 0. 45 kg per ha (active ingredient) ,the safety interval was 31 days (once spraying) ,52 days (twice spraying) and 67 days (three times spraying) on the rice respectively. The soluble degradates of monocrotophos were triether phosphate in the investigated system principally.