悬浮液进样原子吸收光谱法测定核桃粉中钙和镁  

Suspension Sample Introduction for FAAS Determination of Calcium and Magnesium in Powdered Walnut

作　　者：徐强[1] 谢妮[2] 陈庆阳[1] 宋学君[1] 李润国[1] 李国德[3] 

机构地区：[1]沈阳师范大学化学与生命科学学院,沈阳110034 [2]中国医科大学,沈阳110001 [3]沈阳师范大学实验中心,沈阳110034

出　　处：《理化检验（化学分册）》2008年第1期43-44,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：采用悬浮液进样技术,原子吸收光谱法测定核桃粉中钙和镁的含量。将核桃粉悬浮于琼脂胶体中制成悬浮液,直接喷入空气-乙炔火焰,用标准加入法测定,并将测定结果与灰化法测定结果进行了比较,经t检验,在显著性水平α=0.05时两种方法无显著性差异,相对标准偏差小于4.5%,检出限分别为0.11 mg.L-1和0.045 mg.L-1。Technique of suspension sample introduction was applied to the flame atomic absorption spectrometric determination of Ca and Mg in powdered walnut. The sample of powdered walnut was prepared by suspending the powder into an agar solution. The prepared suspension was then directly nebulized and carried into the air acetylene flame. The determination of Ca and Mg was carried out by calibration with standard additions. Analytical results of the suggested method were compared with those of the ashing method. As verified by t-test, no significance difference was found between the two methods at the level of a= 0.05. Values of RSD＇s of the method were 〈4.5%. Detection limits of this method were found to be 0.11 mg·L^-1 （for Ca） and 0. 045 mg·L^-1 （for Mg）.

关 键 词：悬浮液雾化进样 原子吸收光谱法 核桃粉 钙 镁 

分 类 号：O657.31[理学—分析化学]