为加速二苯醚类除草剂在可见光环境的降解,以玉米芯制碳量子点修饰石墨相氮化碳,合成一种非金属型光催化剂.考察在该催化剂作用下,氟磺胺草醚、三氟羧草醚和乙氧氟草醚等的光解行为及光解前后毒性.结果表明,氟磺胺草醚在可见光照射下的...为加速二苯醚类除草剂在可见光环境的降解,以玉米芯制碳量子点修饰石墨相氮化碳,合成一种非金属型光催化剂.考察在该催化剂作用下,氟磺胺草醚、三氟羧草醚和乙氧氟草醚等的光解行为及光解前后毒性.结果表明,氟磺胺草醚在可见光照射下的光解速率最大、其次为乙氧氟草醚,光照3 h的降解率即达99%和91%,而三氟羧草醚的光解速率最低、须光照至8 h才能达到90%的降解率.由高斯软件计算NPA(Natural Population Analysis)电荷分布得福井函数和双描述符,预测反应位点并结合液质联用分析降解产物,推测除草剂的降解过程应包括裂解、水解、脱卤、还原和羟基化等,证明了空穴和羟基自由基在其中的作用.观察玉米种子的生长实验,发现氟磺胺草醚的毒性略高于乙氧氟草醚,但二者经光照处理后毒性均显著下降,三氟羧草醚及其光解产物显示为低毒性.展开更多
In order to discuss the law of the change of body composition of Zhuang-Dong ethnic groups with the change of natural geographical factors(longitude,latitude,annual average temperature and annual average sunshine).Usi...In order to discuss the law of the change of body composition of Zhuang-Dong ethnic groups with the change of natural geographical factors(longitude,latitude,annual average temperature and annual average sunshine).Using BIA to measure the body composition data of 5098 cases of 13 ethnic groups of Zhuang-Dong group in China.At the same time,collect the relevant data of longitude,latitude,annual average temperature and annual average sunshine of 13 ethnic groups,and use per capita disposable income as a control variable to perform partial correlation analysis about body composition with longitude,latitude,annual average temperature,and annual average illumination.Through this research,it was found Zhuang-Dong group fat rate decrease and little change in muscle mass,presumption of bone mass,and water content with the increase of longitude.展开更多
文摘为加速二苯醚类除草剂在可见光环境的降解,以玉米芯制碳量子点修饰石墨相氮化碳,合成一种非金属型光催化剂.考察在该催化剂作用下,氟磺胺草醚、三氟羧草醚和乙氧氟草醚等的光解行为及光解前后毒性.结果表明,氟磺胺草醚在可见光照射下的光解速率最大、其次为乙氧氟草醚,光照3 h的降解率即达99%和91%,而三氟羧草醚的光解速率最低、须光照至8 h才能达到90%的降解率.由高斯软件计算NPA(Natural Population Analysis)电荷分布得福井函数和双描述符,预测反应位点并结合液质联用分析降解产物,推测除草剂的降解过程应包括裂解、水解、脱卤、还原和羟基化等,证明了空穴和羟基自由基在其中的作用.观察玉米种子的生长实验,发现氟磺胺草醚的毒性略高于乙氧氟草醚,但二者经光照处理后毒性均显著下降,三氟羧草醚及其光解产物显示为低毒性.
文摘In order to discuss the law of the change of body composition of Zhuang-Dong ethnic groups with the change of natural geographical factors(longitude,latitude,annual average temperature and annual average sunshine).Using BIA to measure the body composition data of 5098 cases of 13 ethnic groups of Zhuang-Dong group in China.At the same time,collect the relevant data of longitude,latitude,annual average temperature and annual average sunshine of 13 ethnic groups,and use per capita disposable income as a control variable to perform partial correlation analysis about body composition with longitude,latitude,annual average temperature,and annual average illumination.Through this research,it was found Zhuang-Dong group fat rate decrease and little change in muscle mass,presumption of bone mass,and water content with the increase of longitude.