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Method for quantitatively determining content of various types of heavy metal in fly ash by adopting XRF (X-ray Fluorescence) instrument

A technology for quantitative determination of heavy metals, applied in the field of environmental engineering, can solve the problem of lack of rapid, accurate and quantitative determination of fly ash, etc., and achieve the effect of strong timeliness, simple operation and rapid determination.

Pending Publication Date: 2018-09-14
SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of method that adopts XRF instrument to quantitatively measure various heavy metal content in fly ash, for solving the lack of rapid, accurate and quantitative determination of fly ash in the prior art. Problems of methods for eight heavy metal elements of Pb, Cr, Cu, Zn, As, Se, Cd and Ba

Method used

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  • Method for quantitatively determining content of various types of heavy metal in fly ash by adopting XRF (X-ray Fluorescence) instrument
  • Method for quantitatively determining content of various types of heavy metal in fly ash by adopting XRF (X-ray Fluorescence) instrument
  • Method for quantitatively determining content of various types of heavy metal in fly ash by adopting XRF (X-ray Fluorescence) instrument

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Sample pretreatment

[0038] The fly ash produced in the flue gas purification system of the domestic waste incineration plant was taken as the sample to be tested.

[0039] 2. Preparation of fly ash standard samples

[0040]The ratio by weight is 6:4. Calcium oxide and silicon dioxide are mixed to form the base material. Then take a fly ash standard sample of known concentration, add the base material and mix, the weight ratio of the base material to the fly ash standard sample is 5:0~0:5, so as to make a fly ash standard sample. Wherein, the concentration of lead in the fly ash standard sample is 5000 mg / kg, the concentration of chromium is 810 mg / kg, the concentration of copper is 1050 mg / kg, the concentration of zinc is 16800 mg / kg, the concentration of arsenic is 54 mg / kg, cesium The concentration of cadmium is 18.3mg / kg, the concentration of cadmium is 226mg / kg, and the concentration of barium is 4650mg / kg.

[0041] 3. Determination

[0042] The sample to b...

Embodiment 2

[0048] 1. Sample pretreatment

[0049] The fly ash produced in the flue gas purification system of the domestic waste incineration plant was taken as the sample to be tested.

[0050] 2. Preparation of control samples

[0051] The ratio by weight is 3:7-7:3, calcium oxide and silicon dioxide are mixed to form the base material. Then take a fly ash standard sample of known concentration, add the base material and mix, the weight ratio of the base material and the fly ash standard sample added is 4:1~1:4, so as to make a fly ash standard sample. Wherein, the concentration of lead in the fly ash standard sample is 800-6000 mg / kg, the concentration of chromium is 60-4000 mg / kg, the concentration of copper is 300-6500 mg / kg, the concentration of zinc is 2500-75000 mg / kg, the concentration of arsenic The concentration of cesium is 5-150mg / kg, the concentration of cesium is 1-50mg / kg, the concentration of cadmium is 160-350mg / kg, and the concentration of barium is 200-12000mg / kg. ...

Embodiment 3

[0059] According to the preparation method of the fly ash standard sample in step 2 of Example 1, the ratio by weight is 6:4, and calcium oxide and silicon dioxide are mixed to form the base material. Then take a fly ash standard sample of known concentration, add the base material to mix, the weight ratio of the base material to the fly ash standard sample is 5:0, 4:1, 3:2, 2:3, 1:4, 0:5, a total of 6 fly ash standard samples were prepared, and according to the content values ​​of various heavy metal elements in the fly ash standard samples, the content values ​​of each heavy metal element in the 6 fly ash standard samples were calculated. The specific contents of eight heavy metal elements including Pb, Cr, Cu, Zn, As, Se, Cd and Ba are shown in Table 1.

[0060] Table 1 Contents of eight heavy metal elements in fly ash standard samples / (mg / kg)

[0061]

[0062] Take 5g of the 6 fly ash standard samples and put them into the sample test box supporting the XRF instrument....

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Abstract

The invention provides a method for quantitatively determining the content of various types of heavy metal in fly ash by adopting an XRF (X-ray Fluorescence) instrument. The method comprises the following steps: 1) collecting the fly ash as a sample to be detected; 2) taking a fly ash standard sample and adding a substrate substance to prepare a series of fly ash standard test samples containing lead, chromium, copper, zinc, arsenic, cesium, cadmium and barium elements with different concentrations; 3) detecting the sample to be detected and the fly ash standard test samples by adopting an X-ray fluorescence spectrometer respectively; carrying out quantification by adopting a standard curve method to obtain the content of the lead, chromium, copper, zinc, arsenic, cesium, cadmium and barium elements in the sample to be detected. According to the method for quantitatively determining the content of various types of the heavy metal in the fly ash by adopting the XRF (X-ray Fluorescence)instrument, provided by the invention, the disadvantages of digestion pre-treatment and ICP-OES detection of an existing fly ash detection technology can be overcome; accurate and rapid quantitative determination of the content of various types of the heavy metal in the fly ash is realized.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and relates to a method for quantitatively measuring the contents of various heavy metals in fly ash by using an XRF instrument. Background technique [0002] Fly ash in the flue gas purification system of domestic waste incineration plants (hereinafter referred to as "fly ash") is a hazardous waste specified in the "National Hazardous Waste List (2016 Edition)", containing Pb, Cr, Zn, Cu, As, Cd, etc. Toxic and harmful heavy metals must undergo stabilization treatment so that the leaching toxicity of fly ash meets the landfill entry standard before they can be disposed of in landfill. The higher the content of each heavy metal element in the fly ash, the higher the corresponding leaching concentration of the element. Therefore, fast and accurate measurement of the total content of heavy metal elements in fly ash can guide the optimization of fly ash stabilization process parame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223
CPCG01N23/223
Inventor 余召辉张瑞娜邰俊毕珠洁贾川姜燕勤王猛
Owner SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD
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