富氧空气-乙炔火焰原子吸收光谱法测定矿泉水中痕量钡  

Determination of Trace Barium in Mineral Water with Oxygen Enriched Air-acetylene Flame in Atomic Absorption Spectrometry

作　　者：区红[1] 陈斌[1] 何志荣[1] 龚惠玲[1] 何华焜[1] 

机构地区：[1]中国广州分析测试中心,广东广州510070

出　　处：《光谱学与光谱分析》2002年第1期146-148,共3页Spectroscopy and Spectral Analysis

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钡 ,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 5 2 % ,氧炔比为 0 72时对钡有较高的灵敏度。在此火焰中 ,不同浓度的各种酸及大多数金属离子对钡的测定干扰较少 ,当溶液中引入 10 0 0mg·L- 1 K时 ,具有最大的增感及消除干扰的效应。方法的检出限为 0 0 34mg·L- 1 ,灵敏度为 0 16mg·L- 1 / 1% ,相对标准偏差为 2 5 %。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 O-2/C2H2 on the absorbance have been compared. When the amount of oxygen is 52% in mixed gas and the ratio of O-2/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 1000 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 valus, and it was proved that this method are reliable and is suitable for the determination of Ba in mineral water.

关 键 词：原子吸收光谱 富氧空气乙炔火焰 钡 矿泉水 测定 痕量分析 

分 类 号：TS275.1[轻工技术与工程—农产品加工及贮藏工程]