氟化钙增敏石墨炉原子吸收法测定钢中钼

Graphite Furnace Atomic Absorption spectrophotometry for the Determination of Molybdenum in Steel Using the Enhancing Effect of CaF_2

本文考查了一些试剂对石墨炉原子吸收测定痕量钼的增敏作用，确定了用氟化钙作为石墨炉原子吸收光谱法测定钼的基体改进剂，并选择了该体系测定钢中钼的最佳实验条件。实验证明，采用ＣａＦ２作基体改进剂，使钼在３１３．３ｎｍ处的原子吸光度提高了５．７倍，特征景由原来４２×１０－１１ｇ／１％提高到５１×１０－１２ｇ／１％。线性范围为０～１０００ｎｇ／ｍｌ钼，检测下限为０．５５ｎｇ／ｇ。对钼含量为０．０××～×．××％的钢标样测定结果满意。

A graphite furniace atomic absorption spectrophotometry (GFAAS)is described for the determination of trace molybdenum in steel using the enhancement effect of CaF2. In the determination of trace molybdenum with GFAA enhancement effect of some reagents has for studied. CaF2 is selected as a matrix modifier for changing the atomization process of samples.It can raise the sensitivity of the method. The sensitivity is 5.1×10-3ng/ml/1%. The calibration curve is linear over the concentration range of 0-1000ngMo/ml. Trace molybedenum in steel can directly be measured without using the preseparation technique. The relative error is less than ±3.2% for the determination of molybdenum in four standard samples. The method is simple and rapid.