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
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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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