【摘要】 本文介绍了一种操作简便、结果可靠、钙含量可测范围宽(0.5—200ppm)的火焰原子吸收测定法。无论测定低浓度或高浓度钙,除应将燃烧器作90°水平转动外,仪器的其它操作条件都可保持不变。硅酸根、磷酸根和铝对钙的测定有严重干扰,加一定量锶盐作释放剂,效果极为满意。本方法的回收率在测低浓度钙时为95—105％,变异系数(相对标准偏差)<2％;测高浓度钙时为85—98％,变异系数<0.5％。本法测得结果与络合滴定法以及发射光谱法符合程度较好。曾用本法测定过蚕豆、雏鸡、蛋品等食物样品共三百多份,结果均较满意。更多还原

【Abstract】 In this article, a rapid, simple, and dependable method is introduced to determine the content of calcium from 0.5ppm to 200ppm in some foods by AAS. It has not only accuracy but has wide range for the determination of concentration.As for low concentration of calcium, the position of the burner must be parallel to the axis of beam while delerming. For high concentration, changing of the condition of operation is unnecessary except for the burner turn 90° from the axis horizontally. So it is quite easy for operation.The SiO32-, PO43-, and A13+ may interfere in the determination of calcium seriously, but this can be eliminated effectively by adding a certain amount of Sr2+ (as a releasing agent) to the sample to be tested.In the determination of low concentration of calcium, the recovery and coefficient of variation are 95-105% and<2% respectively. For high concentration, they are 85-98% and<0.5% respectively.The result obtained by AAS is almost the same as that of others (AES or CT), and for more than 300 samples of determination, such as rices, chickens, and eggs, their results are fairly satisfactory.更多还原