稀释法快速检测牛奶中的铜

In this experiment, the samples of milk are diluted with 0.5% nitric acid, then measure the copper content in them and the result is 4.2ug/mL .At the same time, to talk about the effect caused by different concentrations of nitric acid in deal with milk, and nitric acid of 0.5% is selected the optimum conditions in diluting. The relative standard deviation is 1.2951% and the recovery was 100%. Furthermore, compared with national standard method, the measured results are consistent. By comparing the experimental results, it shows that the dilution method is simple, and the recovery and precision are satisfactory. The dilution method is a fast convenient and accurate measurement method.