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目的建立流动注射仪检测生活饮用水中挥发酚含量的方法,并计算分析方法的不确定度,为提高生活饮用水中挥发酚的检测质量提供保证。方法确定流动注射自动检测挥发酚的实验条件、方法检出限和线性范围;分析影响测定结果的不确定度的因素,并计算影响检测结果的各不确定度分量。结果建立流动注射分析测定生活饮用水方法的线性范围为0.002~0.200 mg/L(r=0.9998),检出限为0.65μg/L;当样品测定结果为27.0μg/L时,其扩展不确定度为1.78μg/L。结论流动注射分析法测定生活饮用水中挥发酚含量具有快速准确的优点,影响结果不确定度的主要因素是标准溶液的配制、标准曲线的拟合、回收率和重复性实验。
Objective To establish a method for the determination of volatile phenol in drinking water by flow injection and to calculate the uncertainty of the analytical method to provide a guarantee for improving the quality of detection of volatile phenol in drinking water. Methods The experimental conditions, the detection limits and the linear range of volatile phenol for flow injection were determined. The factors influencing the uncertainty of the determination results were analyzed and the components of the uncertainties affecting the detection results were calculated. Results The linear range of flow injection analysis for determination of drinking water was 0.002-0.200 mg / L (r = 0.9998) with a detection limit of 0.65 μg / L. When the sample was determined to be 27.0 μg / L, its expansion was indefinite The degree is 1.78 μg / L. Conclusion The determination of volatile phenolics in drinking water by flow injection analysis has the advantages of fast and accurate. The main factors affecting the uncertainty of results are the preparation of standard solution, the fitting of standard curve, the recovery rate and the repetitive experiment.