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建立干灰化-火焰原子吸收光谱法测定甘草中钙和锌的含量测定方法。样品的前处理采用干灰化法,含量测定采用空气-乙炔火焰原子吸收光谱法(FAAS),干扰消除以La3+作为钙的释放剂消除干扰。分别以钙和锌标准溶液的浓度与吸光度进行线性回归:钙标标准曲线回归方程为Y=0.00192X+0.00363,相关系数为R2=0.9978(n=5),线性范围为4.0-20.0μg/m L,回收率为98.87-99.36%,RSD为0.96-1.06%(n=5);锌标准曲线回归方程为Y=0.0013X-0.02833,相关系数为R2=0.9989(n=5),线性范围为4.0-20.0μg/m L,回收率为99.72-101.03%,RSD为0.81-1.02%(n=5)。该方法操作简便、灵敏度高、灵敏度高、准确性好、干扰少、环境污染小等特点,是一种比较理想的方法。
Determination of Calcium and Zinc in Glycyrrhiza by Flame Atomic Absorption Spectrometry with Dry Ashing. The sample was pre-treated with dry ashing method, the content of which was determined by air-acetylene flame atomic absorption spectrometry (FAAS), and interference was eliminated by using La3 + as a calcium releasing agent. The regression equation of calcium standard curve was Y = 0.00192X + 0.00363, the correlation coefficient was R2 = 0.9978 (n = 5), the linear range was 4.0-20.0μg / m L, the recovery was 98.87-99.36% and the RSD was 0.96-1.06% (n = 5). The regression equation of zinc standard curve was Y = 0.0013X-0.02833 and the correlation coefficient was R2 = 0.9989 (n = 5) 4.0-20.0μg / m L, recovery was 99.72-101.03%, RSD was 0.81-1.02% (n = 5). The method is simple and convenient, high sensitivity, high sensitivity, good accuracy, less interference and less environmental pollution, which is an ideal method.