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本文对鲁米诺-过氧化氢铬(Ⅲ)化学发光体系进行了系统研究,选定了测定钛合金中痕量铬的最佳条件。该体系以铬(Ⅲ)作为氧化剂直接氧化鲁米诺产生λ_(max)为425nm的闪烁化学发光。测定铬的线性范围为10~(-9)—10~(?)克毫升,检测限为10~(-11)—10~(-9)克毫升,测定10~(-9)克毫升铬的变异系数为5(?)。采用硼砂氢氟酸分解试样,EDTA和氟作为掩蔽剂可消除大量铁和钛以及其他大多数离子的干扰。不需要预富集分离,可直接用化学发光法测定钛合金中痕量铬,结果均比较满意。
In this paper, the luminol-chromium (III) oxide chemiluminescence system was systematically studied, and the optimum conditions for the determination of trace chromium in titanium alloy were selected. The system uses chrome (Ⅲ) as an oxidant to directly oxidize luminol to produce a scintillation chemiluminescence with λ max of 425 nm. The linear range of the determination of chromium was 10 -9 -10 -10 μg ml, with a detection limit of 10-11 -10 -9 μg mL, and a 10 -9 -9 ml Cr The coefficient of variation is 5 (?). Borax hydrofluoric acid decomposition samples, EDTA and fluorine as a masking agent to eliminate a large number of iron and titanium and most other ions interference. Without preconcentration, the trace chromium in titanium alloy can be directly measured by chemiluminescence method. The results are satisfactory.