建立高压密闭消解原子荧光法测定酱油中总砷含量的方法,探讨了消解方式、赶酸方式对检测结果的影响。吸取酱油2.0 m L置于高压消解罐内罐中,加入8 m L硝酸、2 m L盐酸,室温预消解0.5h后补加高氯酸2 m L,120℃保持1 h,180℃保持0.5 h,冷...建立高压密闭消解原子荧光法测定酱油中总砷含量的方法,探讨了消解方式、赶酸方式对检测结果的影响。吸取酱油2.0 m L置于高压消解罐内罐中,加入8 m L硝酸、2 m L盐酸,室温预消解0.5h后补加高氯酸2 m L,120℃保持1 h,180℃保持0.5 h,冷却后超声赶酸脱气20min,加入预还原剂,定容至25 m L,放置30 min测试砷原子荧光强度。该方法线性相关系数r为0.9999,RSD为1.5%~2.8%(n=6),样品加标回收率为97%~99%。该法快速安全高效、试剂用量少、没有砷流失、环保卫生,满足食品检测要求。展开更多
Using a sonochemical reactor designed by the authors,the process of removing sulfur dioxide from cit- rate solution simulating the flue gas desulfurization was studied.The influence of ultrasonic frequency,ultrasonic ...Using a sonochemical reactor designed by the authors,the process of removing sulfur dioxide from cit- rate solution simulating the flue gas desulfurization was studied.The influence of ultrasonic frequency,ultrasonic power,reaction temperature,stirring speed,inert gases,initial concentration of sulfur dioxide and concentration of citrate on the efficiency of sulfur dioxide desorption,the stability of citrate solution and the concentration of sulfate radical was examined systematically.By comparing the desorption of sulfur dioxide with and without ultrasonifica- tion,it was concluded that(1)lower ultrasonic frequency results in a better degassing efficiency;(2)the use of ul- trasonification in desorbing sulfur dioxide from citrate solution improves the desorbing efficiency in some condi- tions,without changing the essence of chemical reactions;(3)sparging inert gas into the liquid can lower the vis- cosity of solution and the cavitating threshold,and raise the desorption efficiency.These results demonstrate a technical way for deep desorption of sulfur dioxide and provide the fundamental data for future industrial disposal of sulfur dioxide.展开更多
文摘建立高压密闭消解原子荧光法测定酱油中总砷含量的方法,探讨了消解方式、赶酸方式对检测结果的影响。吸取酱油2.0 m L置于高压消解罐内罐中,加入8 m L硝酸、2 m L盐酸,室温预消解0.5h后补加高氯酸2 m L,120℃保持1 h,180℃保持0.5 h,冷却后超声赶酸脱气20min,加入预还原剂,定容至25 m L,放置30 min测试砷原子荧光强度。该方法线性相关系数r为0.9999,RSD为1.5%~2.8%(n=6),样品加标回收率为97%~99%。该法快速安全高效、试剂用量少、没有砷流失、环保卫生,满足食品检测要求。
基金Supported by the National Natural Science Foundation of China （No.50244012） and the Natural Science Foundation of Shaanxi Education Department （No.02JC37）.
文摘Using a sonochemical reactor designed by the authors,the process of removing sulfur dioxide from cit- rate solution simulating the flue gas desulfurization was studied.The influence of ultrasonic frequency,ultrasonic power,reaction temperature,stirring speed,inert gases,initial concentration of sulfur dioxide and concentration of citrate on the efficiency of sulfur dioxide desorption,the stability of citrate solution and the concentration of sulfate radical was examined systematically.By comparing the desorption of sulfur dioxide with and without ultrasonifica- tion,it was concluded that(1)lower ultrasonic frequency results in a better degassing efficiency;(2)the use of ul- trasonification in desorbing sulfur dioxide from citrate solution improves the desorbing efficiency in some condi- tions,without changing the essence of chemical reactions;(3)sparging inert gas into the liquid can lower the vis- cosity of solution and the cavitating threshold,and raise the desorption efficiency.These results demonstrate a technical way for deep desorption of sulfur dioxide and provide the fundamental data for future industrial disposal of sulfur dioxide.
