Trace detection method of heavy metals and application thereof

A trace detection method of heavy metals, comprising steps as follows:

• 1) Preparing a quality control sample;
• 2) Mixing the quality control sample with a sample to be tested;
• 3) Using X-ray fluorescence spectrometer for detection of trace heavy metals;
• wherein the heavy metals include As, Pb, Cd, Cr, Cu, Zn and Ni;
• wherein in step 2,
• when a heavy metal element detected is As, a mass ratio of the quality control sample to the sample to be detected is 20:0.27, a standard curve is y=0.9817x−0.0697, and a correlation coefficient is 0.9992;
• when the heavy metal element detected is Pb, the mass ratio of the quality control sample to the sample to be detected is 20:0.27, a standard curve is y=0.9596x+0.0333, and a correlation coefficient is 0.9984;
• when the detected heavy metal element is Cd, the mass ratio of the quality control sample to the sample to be detected is 50:1.6, a standard curve is y=1.0133x−0.0214, and a correlation coefficient is 0.9995;
• when the detected heavy metal element is Cr, the mass ratio of the quality control sample to the sample to be detected is 10:0.076, a standard curve is y=1.0055x−0.0346, and a correlation coefficient is 0.9943;
• when the heavy metal element detected is Cu, the mass ratio of the quality control sample to the sample to be detected is 100:24, a standard curve is y=0.9777x−0.6403, and a correlation coefficient is 0.9965;
• when the heavy metal element detected is Zn, the mass ratio of the quality control sample to the sample to be detected is 100:35, a standard curve is y=1.0666x−4.5605, and a correlation coefficient is 0.9920;
• when the heavy metal element detected is Ni, the mass ratio of quality control sample to sample to be detected is 100:5.4, a standard curve is y=1.0051x−0.8094, and a correlation coefficient is 0.9924.