火焰原子吸收光谱法测定不同品种沙枣中铁、锌的含量

Determination of Iron and Zinc in Elaeagnus angustifolia L. by Flame Atomic Absorption Spectrometry

目的建立干灰化-火焰原子吸收光谱法测定沙枣中铁和锌的含量测定方法。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）。结果：分别以铁和锌标准溶液的浓度与吸光度进行线性回归：铁标标准曲线回归方程为Y=0．025 82X-0．000 17，相关系数为R2=0．999 8（n=5），线性范围为0．40～2．00μg/mL，回收率为98．69％～98．91％，RSD为0．94％-1．03％（n=5） 锌标准曲线回归方程为Y=0．013 577X-0．013 67，相关系数为R2=0．999 7（n=5），线性范围为0．40—2．00μg/mL，回收率为98．75—101．95％，RSD为0．86％-1．04％（n=5）。结论：该方法操作简便、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。

ObjectiveTo establish a dry ashing - determination method for the determination of iron andzinc Elaeagnus angustifolia L. by flame atomic absorption spectrometry. Method ： Pre - treatment of thesample by dry ashing, content was determined by air - acetylene flame atomic absorption spectrometry（FAAS）. Results： respectively, iron and zinc standard solution concentration and absorbance by linearregression： Iron standard standard curve regression equation was Y = 0. 025 82X- 0. 000 17, thecorrelation coefficient R2 = 0. 999 8 （ n = 5 ）, the linear range of 0.40 - 2.00 μg/mL, the recovery was98.69 -98.91% , RSD was 0.94% -1.03% （n = 5） zinc standard curve regression equation was Y= 0. 013 577X -0. 013 67, the correlation coefficient R2 = 0. 999 7 （n = 5 ） , the linear range of 0.40- 2.00μg mL, the recovery was 98.75% - 101.95% , RSD was 0.86% - 1.04% （n = 5）. Conclu-sion：The method is simple, high sensitivity, good accuracy, less interference, less environmental pollu-tion, etc. , and is an ideal method.