采用三电极系统(工作电极:滴汞电极;参比电极:甘汞电极;辅助电极:铂丝电极),在pH=4.9的六次甲基四胺缓冲溶液中,利用P r3+-ALC-F-三元络合体系及单扫描极谱法测定地质样品、土壤及生物样品中微量氟,该方法操作方便、快速、灵敏,测量的...采用三电极系统(工作电极:滴汞电极;参比电极:甘汞电极;辅助电极:铂丝电极),在pH=4.9的六次甲基四胺缓冲溶液中,利用P r3+-ALC-F-三元络合体系及单扫描极谱法测定地质样品、土壤及生物样品中微量氟,该方法操作方便、快速、灵敏,测量的回收率为96%~99%。其起始电位为-0.20 V(vs.SCE),峰电位在-0.58 V(vs.SCE)左右,线性范围为1.0×10-6m o l/L^4.0×1-0 5m o l/L,检出限为:8.0×1-0 7m o l/L。展开更多
A novel method for determination of SudanⅠ in food by single scan polarography has been developed in this paper.It was found that a well-shape second derivation polarographic wave was observed at peak potential Ep-0....A novel method for determination of SudanⅠ in food by single scan polarography has been developed in this paper.It was found that a well-shape second derivation polarographic wave was observed at peak potential Ep-0.79V(vs.SCE)in the mediums of sodium tetraborate and ethanol.The peak current for the wave was proportional to concentration of Sudan I.The linear range was 0.1μg/mL^1.6μg/mL.The coefficient of correlation was 0.9983.The detection limit of the method was 0.025μg/mL.Its relative standard deviation(RSD) was ≤1.1%(n=6).Average recoveries of blank were over the range of 88.0%～101.0% and average recoveries of pepper samples were over the range of 91.0%～117.4%.The proposed method is rapid,simple,accurate and highly sensitive,which provided the new gist to improving and perfecting the method for determination of SudanⅠ,and possessed a significant practical value.展开更多
文摘采用三电极系统(工作电极:滴汞电极;参比电极:甘汞电极;辅助电极:铂丝电极),在pH=4.9的六次甲基四胺缓冲溶液中,利用P r3+-ALC-F-三元络合体系及单扫描极谱法测定地质样品、土壤及生物样品中微量氟,该方法操作方便、快速、灵敏,测量的回收率为96%~99%。其起始电位为-0.20 V(vs.SCE),峰电位在-0.58 V(vs.SCE)左右,线性范围为1.0×10-6m o l/L^4.0×1-0 5m o l/L,检出限为:8.0×1-0 7m o l/L。
文摘A novel method for determination of SudanⅠ in food by single scan polarography has been developed in this paper.It was found that a well-shape second derivation polarographic wave was observed at peak potential Ep-0.79V(vs.SCE)in the mediums of sodium tetraborate and ethanol.The peak current for the wave was proportional to concentration of Sudan I.The linear range was 0.1μg/mL^1.6μg/mL.The coefficient of correlation was 0.9983.The detection limit of the method was 0.025μg/mL.Its relative standard deviation(RSD) was ≤1.1%(n=6).Average recoveries of blank were over the range of 88.0%～101.0% and average recoveries of pepper samples were over the range of 91.0%～117.4%.The proposed method is rapid,simple,accurate and highly sensitive,which provided the new gist to improving and perfecting the method for determination of SudanⅠ,and possessed a significant practical value.
