阻抑光度法测定痕量乙醇的研究

Study on Trace Alcohol of Inhibiting Photometric Determination

文章研究了在稀硫酸介质中,乙醇阻抑高碘酸钾氧化中性红褪色反应的各种反应条件,建立了阻抑光度法测定痕量乙醇的新方法。讨论了体系酸度、试剂浓度、反应温度、反应时间、干扰离子等因素对反应体系的影响。选择530nm作为测定波长,确定了阻抑反应的最佳条件。在所选择的试验条件下,方法的线性范围为1.0~7.0μg/25mL,检测限为4×10^(-6)g/L。表观摩尔吸光系数ε=3.68×10~4L/mol·cm。对该方法进行了精密度测定,其相对标准偏差RSD<5%。该方法用于水样中痕量乙醇含量的测定,并进行了加标回收试验,平均回收率为98.6%~98.7%。

The paper makes a study on all response conditions of neutral red fading response of alcohol inhibiting potassium iodate oxidation in rare sulfuric acid medium, sets up the new method of trace alcohol of inhibiting photometric determination. The paper discusses the impact of system acidity, reagent concentration, response-temperature, response-time, disturbing ion on response system.