Determination method for total organic carbon (TOC) of solid combustible matters

A total organic carbon and measurement method technology, which is applied in chemical analysis by titration and chemical analysis by combustion, can solve the problems of burning temperature affecting measurement results, difficulty in obtaining correction coefficients, and secondary pollution of the environment. The carbon measurement method is direct, easy to operate, and does not cause secondary pollution

Inactive Publication Date: 2014-01-22
SICHUAN AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this method: 1. The burning temperature affects the measurement results; 2. It is difficult to obtain the correction coefficient for solid mixtures with a wide range of sources, various types, and complex compositions.
Disadvantages of this method: 1. Non- TOC Reducing substances seriously interfere, therefore, not suitable for solid combustibles with complex composition TOC 2. The analysis process is easy to bring secondary pollution to the environment, which is not conducive to environmental protection

Method used

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  • Determination method for total organic carbon (TOC) of solid combustible matters
  • Determination method for total organic carbon (TOC) of solid combustible matters
  • Determination method for total organic carbon (TOC) of solid combustible matters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: a kind of object combustible TOC The precision and accuracy verification of the determination method, its operation steps:

[0058] (1) Take about 0.6g of the benzoic acid reference reagent, put it into a clean and dry tablet press mold, press it into a compact tablet, remove all loose parts on the surface of the tablet, and accurately weigh the mass (±0.0001g);

[0059] (2) Take an appropriate amount of dry pure cotton thread, accurately weigh the mass (±0.0001g), bind the sample piece with this cotton thread, wrap it on the combustion wire of the calorimeter, and hang it on the combustion spoon ( figure 1 );

[0060] (3) Put a small beaker filled with NaOH solution (2.15 mol / L 50mL) in the burner (oxygen bomb), tighten the cap so that the ignition electrode forms a path, and fill the burner with 2MPa Analyze pure oxygen, operate the exhaust valve to slowly discharge air, repeat 2~3 times of oxygen filling and emptying, and then fill the burner (oxygen...

Embodiment 2

[0071] Embodiment 2: a kind of object combustible TOC The method verification of the determination method, its operation steps:

[0072] (1) Take an appropriate amount of dry pure cotton thread, accurately weigh the mass (±0.0001g), and use it to bind the sample piece;

[0073](2) Take 9 pieces of solid combustible sample pieces with known carbon content and weigh them accurately (±0.0001g). Each 3 pieces is a group, and a certain quality of benzoic acid tablets is added according to the three quality levels of low, medium and high. Use cotton thread to bind a piece of sample piece and the added benzoic acid piece together, wrap it around the burning wire of the fixed burner (oxygen bomb), and hang it on the burning spoon ( figure 1 ), and the remaining steps are carried out according to the steps of Example 1. Calculate the standard recovery rate, the results are shown in Table 2:

[0074] Table 2

[0075]

[0076]

[0077]

[0078] The recovery rate of standard...

Embodiment 3

[0079] Embodiment 3: measure the content of combustible rubbish with the inventive method TOC value, its operation steps:

[0080] (1) The samples were collected at the Luojiaba Garbage Compression Station in Chengdu. They were combustible garbage samples. The samples were classified according to plants, waste paper, waste plastic rubber, old fabrics, and waste wood. They were dried at 105°C until the quality was constant. Sieve (diameter 0.25mm), shrink, seal, and store in a desiccator for testing;

[0081] (2) Take a sample of 0.3~0.6g, put it into a clean and dry tablet press mold, press it into a compact tablet, remove all loose parts on the surface of the tablet, and accurately weigh the mass (±0.0001g); the rest of the steps are as described in the examples 1 step is performed, calculating TOC value, the resulting expression:

[0082]

[0083] (3) Measure the classified samples according to the above method, measure 3 batches, parallel 3 times with the same batch...

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Abstract

The invention belongs to the field of analysis and testing technology and specifically discloses a determination method for TOC of solid combustible matters. The method comprises the following steps: placing a solid combustible matter sample with certain mass into a combustor (an oxygen bomb) filled with an excess NaOH solution for complete combustion so as to thoroughly oxidize organic carbon into CO2; allowing the NaOH solution to completely absorb CO2 and converting CO2 into Na2CO3; adjusting a pH value to 8.32 by using a hydrochloric acid solution to convert Na2CO3 to NaHCO3; and measuring carbon content in NaHCO3 by using acid-base titration and calculating the TOC value of the solid combustible matter. The method provided by the invention has the characteristics of clear chemical principles, direct carbon measurement, reliable analysis, accurate analysis results, easy and convenient operation, low analysis cost and environmental protection and is applied to determination of TOC of solid combustible matters with complex composition and to related fields.

Description

technical field [0001] The invention relates to the technical field of chemical analysis and testing, in particular to a solid combustible total organic carbon ( TOC ) measurement method. Background technique [0002] Municipal solid waste treatment technologies mainly include landfill, incineration and composting. Incineration is one of the three main technologies for solid waste (solid combustible) treatment and disposal. The treatment rate is high; the heat energy generated by the incineration of combustible waste of municipal solid waste is converted into usable energy, which is the mainstream of realizing low-carbon and environmental protection in the world today. The amount of calorific value produced by the combustion of solid combustibles is mainly determined by the total organic carbon ( TOC ) value determines, therefore, the solid combustible TOC It is very important to measure in this field. [0003] domestic and foreign TOC Determination of relevant standard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N31/16
Inventor 甄铧张学毅曾巧王双燕武婷婷
Owner SICHUAN AGRI UNIV
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