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研究了在硫酸介质中 ,痕量铬 对催化过氧化氢氧化偶氮胂I的褪色反应及动力学条件 ,建立了测定痕量Cr 的新方法。方法检出限为 6 4× 1 0 - 1 2 g/L ,线性范围 0 5～ 1 2 0 μgCr / 2 5mL。用于水样、钢样和铝合金中铬的测定 ,结果满意。
The fading reaction and kinetic conditions for the oxidation of arsenazo I with hydrogen peroxide in a sulfuric acid medium were studied. A new method for the determination of trace Cr was established. The detection limit of this method was 6 4 × 10 12 - g / L with a linear range of 0 5 ~ 120 μgCr / 2 5 mL. Used for the determination of chromium in water sample, steel sample and aluminum alloy with satisfactory results.