Method for accurately measuring heavy metal content in waste incineration slag

Abstract

The invention relates to a method for accurately measuring heavy metal content in waste incineration slag. The method comprises the following steps: sampling, drying, pulverizing, drying again, weighing a quantitative sample, adding concentrated hydrofluoric acid and concentrated nitric acid for digestion, putting into a high-temperature high-pressure digestion tank for high-temperature digestion,adding an internal standard, and fixing the volume to 50ml; adopting a standard addition method to prepare a test solution, and then adopting an inductively coupled plasma mass spectrometer to accurately measure the heavy metal content in a sample solution by employing the standard addition method. According to the method, nitric acid-hydrofluoric acid high-temperature high-pressure complete digestion is combined with the ICP-MS inductively coupled plasma mass spectrometer to accurately measure the heavy metal content in the slag, a measurement sample is completely digested, an undissolved part does not exist, and that a test result truly reflects the content of the heavy metal in the slag is ensured. The standard addition method effectively eliminates the influence of the matrix effect and ensures the accuracy of the measurement result.

Description

technical field [0001] The invention belongs to the technical field of heavy metal element analysis, and in particular relates to a method for accurately measuring heavy metal content in garbage incineration slag. Background technique [0002] Municipal solid waste treatment technologies mainly include landfill, composting and incineration. Compared with landfill and composting, domestic waste incineration technology occupies a small area, has a high rate of waste reduction and volume reduction, and has good sanitary conditions, and can reuse the heat generated by domestic waste incineration. It occupies an increasing role in the waste treatment system Important position. Domestic waste incineration treatment can reduce the volume of domestic waste by more than 70%, but waste incineration also produces a large number of incineration residues, including incineration fly ash, waste heat boiler ash and slag, of which slag accounts for 80% of the total incineration residue . ...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of measuring heavy metal content in slag basically adopts nitric acid-hydrochloric acid high-temperature digestion and standard curve-absorption spectrometry. This method can dissolve most inorganic salts, but ignores the existence of some substances that cannot be dissolved by nitric acid-hydrochloric acid. Such as silicate, etc. In addition, there are obvious matrix effects in this method, and there are many interference factors, resulting in inaccurate measurement results

Images