摘要
本文研究了用富氧空气—乙炔火焰原子吸收光谱法测定祁连黄蘑菇中的钙和镁,比较了乙炔流量、氧气流量及氧炔比的影响,当混合空气中含氧量为34%,氧炔比为0.81时对钙和镁有较高的灵敏度.在此火焰中,不同浓度的各种酸及大多数金属离子对钙和镁的测定干扰较少,当溶液中引入0.1%镧盐+1%磺基水杨酸时,具有最大的增感及消除干扰的效应.方法的检出限为0.13ngmL-1和0.32ngmL-1,相对标准偏差(RSD)分别为3.7%和2.5%(n=8,C=50ngmL-1).
In this paper , the determination of Calcium and Magnesium in Yellow mushroom using oxygen enriched air-acetylene flame in AAS has been studied and the effect of acetylene flow , oxygen flow and the ratio of O2/C2 H2on the absorbance have been compared. When the amount of oxygen is 34 % in mixed gas and the ratio of O2/C2 H2is about 0.82, higher sensitivity for Calcium and Magnesium can be obtained. In this flame acids and most of elements did not interfere. By adding organic reagent the interference can be minimized and the sensitivity for the determination of Calcium and Magnesium can be increased. The detection limit of the method is 0.13ng mL^-1 and 0.32ng mL^-1 and the relative standard deviation is 3.7% and 2.5%.
出处
《青海师范大学学报（自然科学版）》
2007年第2期51-55,共5页
Journal of Qinghai Normal University(Natural Science Edition)
关键词
富氧空气—乙炔火焰
原子吸收
祁连黄蘑菇
钙
镁
atomic absorption spectrometry
oxygen enriched airacetylene flame
yellow mushroom
calcium
magnesium
