Method for accurately measuring heavy metal content in waste incineration slag

A technology for waste incineration slag and heavy metals, which is used in measurement devices, preparation and sampling of samples for testing, etc., can solve the problems of inaccurate measurement results and many interference factors, and achieve a wide dynamic linear range, high analysis accuracy, and detection limit. low effect

Pending Publication Date: 2020-08-25
南京浦世环境科技发展有限公司
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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

Method used

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  • Method for accurately measuring heavy metal content in waste incineration slag
  • Method for accurately measuring heavy metal content in waste incineration slag
  • Method for accurately measuring heavy metal content in waste incineration slag

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Embodiment 1

[0034] Taking the slag samples of three waste incineration plants (one slag sample was taken from the slag collection pool under the incinerator of a waste incineration plant in Chongqing, a waste incineration plant in Hangzhou, and a waste incineration plant in Wenzhou respectively) as an example, the heavy metal elements Cr, Co, Mn, Cu, Ni, Zn, As, Cd, Pb content.

[0035] A method for accurately measuring heavy metal content in waste incinerator slag, comprising the steps of:

[0036] (1) Treatment of slag: After drying the slag in an electric blast drying oven, grind it with an agate mortar, pass through a 200-mesh sieve, and then dry it again in an electric blast drying oven to obtain a processed slag sample;

[0037] (2) Preparation of sample liquid: Take 50 mg of treated slag samples respectively, place them in a 10 ml polytetrafluoroethylene sample dissolving tank, add 1.0-2.0 ml of concentrated hydrofluoric acid, and steam on a 120°C electric heating plate until wet ...

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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 . ...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/40G01N27/626
CPCG01N27/62G01N1/4044G01N1/4055
Inventor 姚希柱杨涛赵良柏小东秦欢张莹刚
Owner 南京浦世环境科技发展有限公司
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