目的:建立一种简便、灵敏的测定氯胺酮(KET)新方法。方法:基于氧化剂存在时 KET 产生的极谱催化波,用线性扫描极谱法快速测定 KET。结果:在1.46×10^(-2)mol·L^(-1)Britton-Robinson(pH 2.09)支持电解质中,KET 于-1.44V(vs.SCE...目的:建立一种简便、灵敏的测定氯胺酮(KET)新方法。方法:基于氧化剂存在时 KET 产生的极谱催化波,用线性扫描极谱法快速测定 KET。结果:在1.46×10^(-2)mol·L^(-1)Britton-Robinson(pH 2.09)支持电解质中,KET 于-1.44V(vs.SCE)处产生1个还原波。引入过硫酸钾后,该还原波峰电流增加约10倍,峰电位基本不变,产生一极谱平行催化波。其二阶导数峰峰电流与 KET 的浓度在1.0×10^(-9)～1.0×10^(-7)mol·L^(-1)范围内呈线性关系(r=0.9995,n=11),检出限为4.0×10^(-10)mol·L^(-1)。结论:该方法可用于药剂中 KET 含量的测定。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
文摘目的:建立一种简便、灵敏的测定氯胺酮(KET)新方法。方法:基于氧化剂存在时 KET 产生的极谱催化波,用线性扫描极谱法快速测定 KET。结果:在1.46×10^(-2)mol·L^(-1)Britton-Robinson(pH 2.09)支持电解质中,KET 于-1.44V(vs.SCE)处产生1个还原波。引入过硫酸钾后,该还原波峰电流增加约10倍,峰电位基本不变,产生一极谱平行催化波。其二阶导数峰峰电流与 KET 的浓度在1.0×10^(-9)～1.0×10^(-7)mol·L^(-1)范围内呈线性关系(r=0.9995,n=11),检出限为4.0×10^(-10)mol·L^(-1)。结论:该方法可用于药剂中 KET 含量的测定。
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.
