Objective To optimize an accurate,sensitive and practical method for detecting heavy metal lead in drinking water,and to provide strong technical support for drinking water safety monitoring.Methods The graphite furnace atomic absorption test was used for the study.Samples of drinking water are pretreated to remove impurities and disturbing substances and then tested for lead levels.In the process of experiment,the sensitivity and accuracy of the detection method were improved by optimizing the experimental conditions,selecting the appropriate reagents and instrument parameters.Results The standard curve of lead measured in the experiment has a good linear relationship,and the linear coefficient is greater than 0.999.Within the set linear range,the relative deviation is small and the precision is high.The recovery rate is 95%～105%,indicating the accuracy of the experimental method.The ashing temperature set in the experiment is 800℃,and the atomization temperature is 1800℃.The setting of these temperature parameters helps to improve the sensitivity and accuracy of the measurement.Concentrations of 0,5.00,10.00,20.00,30.00 μg/L and standard samples were 0.0055,0.0468,0.0881,0.1532 and 0.2328,respectively.Conclusion Graphite furnace atomic absorption assay is an effective method for detecting heavy metal lead in drinking water.The method has high sensitivity and accuracy,and can meet the needs of drinking water safety monitoring.By using this method,the content of heavy metal lead in drinking water can be monitored and controlled effectively,and the drinking water safety can be guaranteed.At the same time,this method also provides a useful reference for the detection of other heavy metal elements.
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