强化食品中钙含量测定方法探讨

Exploration of calcium determination in intensified food

目的通过对大量不同产地不同种类的强化食品(含量在1.0～14g/kg)进行试验后,初步探讨出了测定高含量钙(通常在1.6～14g/kg)的强化食品中钙含量的方法。方法增加样品稀释度后利用EDTA滴定法、原子吸收法进行实验。结果应用该法可以对国标法检测范围的局限性加以改善。通过对改进后的国标进行系列可行性试验后表明,原子吸收法回收率在90.2%～103%,平均回收率为96.07%,cv%在0.36%～1.90%,EDTA滴定法回收率在87.9%～97.8%,平均回收率为92.56%,cv%在1.82%～5.72%。显著性实验结果P>0.05。原子吸收法与EDTA滴定法测定结果无显著性差异。结论由此可初步证实采用本法不仅可使原子吸收法和EDTA滴定法的测定都可得到精密准确的结果,而且也说明了被广泛用于微量分析的原子吸收法对测定强化食品中高含量钙是简易可行的。

Objective Through carrying out tests of a large number of intensified food of different origin and kind （ content in 1 ~ 14g / kg ）, method of high calcium determination （ usually in the 1.6 ~ 14g / kg ） in intensi- fied food is explored. Methods Carry out tests by EDTA titration, atomic absorption method experiment after in- creasing sample dilution. Results Confinement of national standard method detection range will be improved by this method. Improved GB feasibility tests show that atomic absorption spectrometry recovery rate is 90.2 103%, the average recovery is 96.07%, cv% is 0.36 - 1.90%, EDTA titration of the recovery rate is 87.9 ~ 97.8% , the average recovery is 92.56%, cv% in 1.82 ~ 5.72%. Significant experimental results of P 〉 0.05 atomic absorption method and EDTA titration method for the determination of the results show no significant differ- ence. Conclusion It can be confirmed that the method can not only get accurate can get accurate results, but also explains is widely used in trace analysis by atomic absorption method for determination of high calcium content in fortified foods is simple and feasible.