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Method for analyzing contents of fluorides in hazardous wastes

A hazardous waste and analysis method technology, which is applied in the direction of analyzing materials, electrochemical variables of materials, and material analysis through electromagnetic means, can solve the problems of fluoride recovery test, deviation of test results, cumbersome operation, etc., and achieve sample pretreatment method Convenience, loss avoidance, and accuracy guaranteed

Inactive Publication Date: 2019-07-26
江门市崖门新财富环保工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no analytical standard for the total amount of fluoride in hazardous waste. Some existing literature uses oxygen bomb combustion-ion chromatography. Ultrasonic waves or shaking in a water bath for about 1 hour are used in the pretreatment process, which is cumbersome and time-consuming. , and the recovery test of fluoride in the gas after the oxygen bomb combustion was not carried out, which led to deviations in the test results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The sample is the determination of the fluoride content in waste engine oil whose waste category is HW08 in the "National List of Hazardous Wastes"

[0019] 1) Sample pretreatment: Stir to mix the sample evenly.

[0020] 2) Extraction of sample fluoride: Weigh 0.3011 g of sample and place it in an oxygen bomb crucible. Fix the crucible in the oxygen bomb and install the fire wire. Pour 10 mL of absorbing liquid into the oxygen bomb terminal, and operate the calorimeter to automatically oxygenate and ignite for combustion. After combustion, 20 mL of absorption liquid is injected into the absorption station, and the oxygen bomb is connected to the gas absorption station to control the gas release rate so that the gas in the oxygen bomb is released into the gas absorption station within 20 to 30 minutes. After all the gas is exhausted, collect the absorbing liquid of the oxygen bomb and the absorbing liquid of the gas absorbing station, put them in a 50mL poly...

Embodiment 2

[0023] Example 2: The sample is the determination of the fluoride content in the distillation residue of HW11 in the "National Hazardous Waste List" waste category

[0024] 1) Sample pretreatment: crush the sample to a particle size of 200 μm.

[0025] 2) Extraction of sample fluoride: Weigh 0.2008 g sample and place it in an oxygen bomb crucible. Fix the crucible in the oxygen bomb and install the fire wire. Pour 10 mL of absorbing liquid into the oxygen bomb terminal, and operate the calorimeter to automatically oxygenate and ignite for combustion. After combustion, 20 mL of absorption liquid is injected into the absorption station, and the oxygen bomb is connected to the gas absorption station to control the gas release rate so that the gas in the oxygen bomb is released into the gas absorption station within 20 to 30 minutes. After all the gas is exhausted, collect the absorbing liquid of the oxygen bomb and the absorbing liquid of the gas absorption station, put them in...

Embodiment 3

[0028] Embodiment 3: The sample is the determination of the fluoride content in the paint residue of HW12 in the waste category of "National List of Hazardous Wastes"

[0029] 1) Sample pretreatment: crush the sample to a particle size of 200 μm.

[0030]2) Extraction of sample fluoride: Weigh 0.1998 g of sample, place it in an oxygen bomb crucible, and add 0.2 g of benzoic acid. Fix the crucible in the oxygen bomb and install the fire wire. Pour 10 mL of absorbing liquid into the oxygen bomb terminal, and operate the calorimeter to automatically oxygenate and ignite for combustion. After combustion, 20 mL of absorption liquid is injected into the absorption station, and the oxygen bomb is connected to the gas absorption station to control the gas release rate so that the gas in the oxygen bomb is released into the gas absorption station within 20 to 30 minutes. After all the gas is exhausted, collect the absorbing liquid of the oxygen bomb and the absorbing liquid of the ga...

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Abstract

The invention provides a method for analyzing the contents of fluorides in hazardous wastes. According to the method, a pretreated sample is completely combusted in an enclosed space by adoption of anoxygen bomb combustion technology; one part of the fluorine element in the oxygen bomb is absorbed by absorption liquid in the oxygen bomb and the other part is absorbed by absorption liquid in a gasabsorption station through a gas form; the absorption liquid is combined to obtain fluoride extracting solution; and the extracting solution is treated to obtain to-be-tested sample solution. Fluorine ion series standard solution is prepared; and a standard curve is drawn for a negative logarithm (E(Mv)-log cF-(mg / L))of the concentration of fluorine ions via a potential value E. An ion chromatograph-fluoride ion selective electrode is utilized to measure the potential value of the to-be-tested sample solution; and the content of the fluorides is calculated via the standard curve according tothe measured potential value. The method is relatively high in test result correctness and is capable of greatly shortening the test time at the same time.

Description

technical field [0001] The invention belongs to the field of chemical analysis and testing, and in particular relates to a method for measuring fluoride content in hazardous waste by oxygen bomb combustion-gas absorption-ion selective electrode method. . Background technique [0002] High-temperature incineration is a common treatment method for hazardous waste. The amount of hydrogen fluoride produced in the incineration tail gas depends on the fluorine content in the incinerated hazardous waste and the combustion conditions. On the one hand, GB 18484-2001 "Pollution Control Standards for Hazardous Waste Incineration" stipulates a limit on the emission of hydrogen fluoride. On the other hand, fluoride will corrode the incineration equipment and affect the service life of the incineration equipment. Therefore, in the hazardous waste treatment and disposal industry, The content of fluoride in the waste must be analyzed, and the content of hydrogen fluoride in the incineratio...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/333G01N27/38G01N1/28
CPCG01N1/28G01N27/333G01N27/38G01N27/416
Inventor 叶汝汉杨宗兴马凤珠罗平许晋陈铭彭学良黎金盛陈嘉庆卢福伟
Owner 江门市崖门新财富环保工业有限公司
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