[原子吸收光谱法中用富氧空气 - 乙炔火焰测定矿泉水中的痕量钡]

[Determination of trace barium in mineral water with oxygen enriched air-acetylene flame in atomic absorption spectrometry].

作者信息

Ou Hong, Chen Bin, He Zhi-rong, Gong Hui-ling, He Hua-kun

机构信息

Chinese National Analytical Centre, Guangzhou 510070, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Feb;22(1):146-8.

PMID:12940054

Abstract

In this paper, the determination of Ba using oxygen enriched air-acetylene flame in AAS has been studied and the effect of acetylene flow, oxygen flow and the ratio of O2/C2H2 on the absorbance have been compared. When the amount of oxygen is 52% in mixed gas and the ratio of O2/C2H2 is about 0.72, higher sensitivity for Ba can be obtained. In this flame acids and most of elements did not interfere. By adding 1,000 mg.L-1 K the interference can be minimized and the sensitivity for the determination of Ba can be increased. The sensitivity of the method is 0.16 mg.L-1/1%, the detection limit is 0.034 mg.L-1, and the relative standard deviation is 2.5%. The analytical results of the standard reference material (GBW08301 and GSD-6) by this method are consistent with the certified values, and it was proved that this method are reliable and is suitable for the determination of Ba in mineral water.

摘要

本文研究了在原子吸收光谱法中使用富氧空气 - 乙炔火焰测定钡，并比较了乙炔流量、氧气流量以及O₂/C₂H₂比例对吸光度的影响。当混合气体中氧气含量为52%且O₂/C₂H₂比例约为0.72时，可获得较高的钡灵敏度。在此火焰中，酸和大多数元素不产生干扰。加入1000 mg·L⁻¹的钾可使干扰降至最低，并提高钡的测定灵敏度。该方法的灵敏度为0.16 mg·L⁻¹/1%，检测限为0.034 mg·L⁻¹，相对标准偏差为2.5%。采用该方法对标准参考物质（GBW08301和GSD - 6）的分析结果与认定值一致，证明该方法可靠，适用于矿泉水中钡的测定。