富氧空气-乙炔火焰原子吸收光谱法测定地质样品中的微量钼  

Determination of Trace Molybdenum in Geological Samples by Air Mixed with Oxygen Acetylene Flame Atomic Absorption Spectrometry

作　　者：马艳芳[1] 池泉[1] 韩红印[2] 汤志勇[1] 金泽祥[1] 

机构地区：[1]中国地质大学材料科学与化学工程学院 [2]中国地质大学工程学院,武汉市430074

出　　处：《光谱实验室》2001年第5期633-636,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：国土资源部科技项目资助 (No.95 0 5 6 10 - 2 )

摘　　要：本文首次提出富氧空气 -乙炔火焰原子吸收光谱法测定地质样品中微量钼的方法。用正交实验方法对实验条件进行了优化选择 ,当观察高度为 10 mm、空气流量为 6.0 L/min、氧气流量为 2 .3L/min、乙炔流量为 5 .4 L/min时 ,对钼的测定具有较高的灵敏度。本法中 ,大多数共存离子对钼的干扰较小 ,溶液中加入表面活性剂十二烷基硫酸钠时 ,具有最大的增感效应和抑制干扰的效应 ,方法的测定精密度为 4 .65 % ,检出限为 0 .0 39μg/m L。应用本法测定地质标准样品中的微量钼 。This paper described a new method for determination of trace molybdenum in geological samples by air mixed with oxygen acetylene flame atomic absorption spectrometry.The optimum determination conditions have been selected.When the observation height is 10mm and the flows of air,acetylene and oxygen are 6.0L/min,5.4L/min and 2.3L/min respectively,the higher sensitivity was obtained.The enhancement effect caused by adding various surfactants has been investigated.It is verified that when 1.5mL SDS(5%) is added,the interference effect of coexisting elements can be minimized and the sensitivity for the determination of molybdenum can be increased.The detect limit of this method is \{0.039\}μg/mL,and the precision is 4.65%.It is used for the determination of trace molybdenum in geological samples with satisfactory results.

关 键 词：富氧空气-乙烯火焰原子吸收光谱法 表面活性剂 钼 地质样品 测定 微量分析 

分 类 号：P575.4[天文地球—矿物学] P585.3[天文地球—地质学]