Method for measuring total quantity of hydracids gas released from combustion of cable

A certain amount of halogen acid technology, applied in the direction of chemical analysis by titration method, can solve the problems of inaccurate determination of the end point, inaccurate measurement, and difficult to observe the discoloration of the indicator. The titration end point is obvious, the accuracy is improved, Easy to observe effect

Inactive Publication Date: 2018-04-13
TIANJIN FIRE RES INST
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Problems solved by technology

However, the color change of the indicator in this method is extremely difficult to observe, and the end point cannot be accurately judged, which is the main reason for the inaccurate determination.

Method used

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Experimental program
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Embodiment Construction

[0034] The present invention will be further described below by embodiment; Embodiment.

[0035] 1. Using samples and reagents

[0036] ①1g electric (wire) cable

[0037] ②Distilled water

[0038] ③0.1M sodium hydroxide (NaOH) solution (M is the molar concentration);

[0039] ④0.1M silver nitrate (AgNO 3 ) solution;

[0040] ⑤5% potassium chromate (K 2 CrO 4 ) solution (5g of potassium chromate dissolved in 95mL of distilled water);

[0041] ⑥PH test paper.

[0042] 2. Determination steps

[0043] 1. Clean all kinds of experimental equipment with distilled water.

[0044] 2. Place an accurately weighed 1g electric (wire) cable sample in the combustion tube of the tube furnace, and then introduce the halogen acid gas released by combustion into a washing bottle filled with 200mL of 0.1M sodium hydroxide (NaOH) solution Fully absorbed in the medium, and measured with PH test paper, the pH of the sodium hydroxide solution is required to be 7-8.

[0045] 200mL of 0.1M s...

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Abstract

The invention discloses a method for measuring the total quantity of hydracids gas released from combustion of a cable. The method comprises the following steps: combusting an electric wire and the cable in a heating furnace; fully absorbing released hydracids gas by using a sodium hydroxide solution; taking a potassium chromate solution as an indicator; and titrating halide ions X<-> by using silver nitrate. Because haloid is salt generated by strong acid, the haloid reacts with silver nitrate at first to generate AgX yellow and white precipitate. After haloid ions and silver ions are completely combined chemically, excessive silver ions react with chromic acid ions to generate pink precipitate for indicating a titration end point. The amount of substances of the haloid ions is the amountof substances of consumed AgNO3, and therefore, the amount of released hydracids gas is calculated. The method has the advantages that the titration end point is obvious, observation is facilitated,and therefore, accuracy of measurement of the content of haloid acid is improved.

Description

technical field [0001] The invention relates to a measurement technology for gas released during fire fighting combustion, in particular to a method for measuring the total amount of halogen acid gas released by cable combustion. This determination method is applicable to GB / T17650.1-1998 "Test method for gases released from electric cables or optical cables when they burn - Part 1: Determination of the total amount of halogen acids". Alternative method for the determination of the total amount of halogen acid (except hydrofluoric acid) gases released upon combustion of polymer-based mixtures and halogen-containing additive mixtures. Background technique [0002] The test method used in the standard GB / T17650.1-1998 "Test method for gases released from burning cables or optical cables - Part 1: Determination of the total amount of halogen acid" is that the test material is heated in a dry air flow, The released gas is absorbed in 0.1M sodium hydroxide solution, and then the...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 陈彦菲赵婧杨亮李玮瑜
Owner TIANJIN FIRE RES INST
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