几种常见钙剂中镁的含量测定

目的:建立钙剂中镁含量测定的火焰原子吸收分光光度法,测定几种常见钙剂中镁的含量,并与镁和碱金属盐检测结果比较。方法:采用镁空心阴极灯,检测波长285.2 nm,狭缝宽度0.2 nm,灯电流3.0 mA,选择原子吸收分光光度法中的标准曲线法和标准加入法分别测定各钙剂中镁的含量;采用炽灼残渣称量法测定各钙剂中镁及碱金属盐。结果:采用原子吸收分光光度法中的标准曲线法和标准加入法检测同一样品,结果存在一定差异;但是,采用不同方法检测,不同样品之间镁含量差异具有相同趋势。结论:与镁及碱金属盐测定方法相比,采用原子吸收分光光度法中的标准曲线法和标准加入法,均能准确测定钙剂中镁的含量,对于镁含量较高的样品,为了便于操作,在采用抗干扰剂排除干扰的情况下,宜选用标准曲线法。

Determination of Magnesium in several common Calcium supplements

Objective:Flame atomic spectrophotometry was established for the determination of magnesium in calcium supplements,and the content of magnesium in several calcium supplements was determined.Otherwise,the results were compared with the content demonstrated by magnesium and alkali metal salts.Methods:With the condition which magnesium lamp was used with the wavelength at 285.2 nm,the slim width was set at 0.2 nm,and the lamp current at 0.3 mA,the calibration curve method and the standard additive method was used for the determination of magnesium in calcium supplements by flame atomic absorption spectrometry.Ignition residue was used for determination of limit of magnesium and alkali salts.Results:There are some differences in the results obtained by different determination methods,but these results show the same trend between different samples.Conclusion:Compared with the method for determination of magnesium and alkali metal salts,both standard curve method and standard additive method can accurately determine the content of magnesium in calcium supplements.As samples with higher content of magnesium,the calibration curve method is better than the standard additive method in the case of eliminating interference by using anti-interference agents.