温度对对氨基苯磺酸钠复合物形成及分解的影响

EFFECF OF TEMPERATURE ON THE FORMATION AND DECOMPOSITION OF SODIUM SUIFANILATE-CONJUOATE

温度显著地影响花生体内对氨基苯磺酸钠复合物的形成。根部浸药的花生小苗在35℃时体内形成对氨基苯磺酸钠复合物的量极显著高于17、25、30、32和40℃。花生离体叶酸合成酶的试验结果与小苗试验结果基本一致,都表明较高温度有利于对氨基苯磺酸钠复合物的形成,当温度达35℃左右复合物形成的量达最大值。这与田间观察到的高温客易产生药害是基本一致的。这说明形成对氨基苯磺酸钠复合物与药害的产生有密切的内在联系。 对氨基苯磺酸钠复合物在60℃时显著分解,在50℃以下较稳定。温度对复合物分解曲线显S型,其方程为: x=159.91/(1+e^(66434-0.1025)

The roots of groundnut seedlings were immersed in 0.33% sodium sulfanilate solution for 24 hr.The formation of sodium sulfanilate-conjugate at different temperatures was studied.The amount of the conjugate was found to be the largest at 35℃,while those at 17,25,and 30℃ were nearly at the same level,being significantly smaller.The results agreed well with field observations on the effect of temperature on the toxicity of the test compound to groundnut plants that its phytotoxicity was most serious at 34℃.The conjugate was cot stable at high temperatures,the rate of decomposition being the highest around 65℃.However,it was found to be stable at temperatures lower than 50℃.