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用同位素示踪技术研究了久效磷在水稻——土壤——水系统中的运转和消失动态。结果表明,久效磷进入该系统中后降解消失很快,在水稻植株、土壤及水中的残留半减期分别是11.2天、16.0天和5.0天;其残留最大小顺序是:水稻植株>水>土壤,可由下列回归方程表示与时间的定量关系:水稻植株:_1=11.14081e~(-0.0621t)r_1=-0.9739;土壤(甲醇可溶态):_2=0.1139e~(-0.0435t),r_2=-0.8492;水:_3=1.3675e~(0.1400t),r_3=-0.8922。对水稻植株中久效磷及其甲醇可溶态降解产物的薄层层析分析表明,久效磷进入水稻中后,主要降解为磷酸三酯。
The isotope tracing technique was used to study the dynamics of monocrotophos in rice-soil-water system. The results showed that monocrotophos entered into this system and its degradation disappeared very quickly. The residual half-lives in rice plants, soil and water were 11.2 days, 16.0 days and 5.0 days, respectively. The order of the residues was: rice plants> water > Soil, the quantitative relationship with time can be expressed by the following regression equation: Rice plants: _1 = 11.14081e ~ (-0.0621t) r_1 = -0.9739; Soil (methanol soluble): _2 = 0.1139e ~ (-0.0435 t), r_2 = -0.8492; water: _3 = 1.3675e ~ (0.1400t), r_3 = -0.8922. Thin layer chromatographic analysis of monocrotophos and its methanol soluble degradation products in rice plants showed that monocrotophos degraded to phosphotriester mainly when it entered rice.