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Detection method of trace volatile sulfide in gypsum board

A technology of volatile sulfides and detection methods, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of limited types of sulfides, poor selectivity, accurate analysis of difficult volatile sulfides, etc., and achieve accurate and reliable measurement results. High sensitivity and good selectivity

Inactive Publication Date: 2011-11-23
CHEM MINERALS & METALLIC MATERIALS INSPECTION CENT OF TIANJIN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methods for detecting gas sulfides have been reported, such as the rapid detection method based on semiconductor sensors (CN 101295425 B), the method of using detection tube colorimetry (CN 101672790A), etc. The common defects of these methods are: poor selectivity, difficult for low The concentration of volatile sulfides can be accurately analyzed; currently there is a national standard method (GB / T 14678-93) that uses capillary column separation to improve the accuracy of analysis, but the types of sulfides that can be detected are limited and do not involve sulfur dioxide, carbon sulfide, Analysis method of carbon disulfide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Determination of COS volatilized by gypsum board:

[0047] Take 3m 2 Put the gypsum board into 1m 3 In the climate box, set the temperature in the climate box to 25?С and the humidity at 50%, leave it for 15 days, weigh 150 mg of Tenax-TA resin and fill it in a PTFE tube, and place it in the aging furnace at 220?С Aging for 2 h.

[0048] Take a piece of aged Tenax-TA resin, under liquid nitrogen cooling conditions, respectively adsorb the prepared calibration gas 0.5mL, 1mL, 1.5mL, 2mL, 2.5mL, put it in the desorption furnace, set the desorption temperature 200?С , The desorption time is 2 min, the nitrogen purge time is set to 0.1 min, and the desorption gas enters a gas chromatograph (GC-FPD) equipped with a flame photometric detector for quantitative analysis, and a standard curve is drawn.

[0049] Use the above-mentioned aging adsorption tube to adsorb the prepared standard gas 0.5mL, 1mL, 1.5mL, and place it in the desorption furnace, set the desorption tempe...

Embodiment 2

[0051] Example 2: Determination of H volatilized from gypsum board 2 S:

[0052] Take 2 m 2 Put the plasterboard into 1 m 3 In the climate box, set the temperature in the climate box to 28°С and the humidity to 60%. Place it for 10 days, weigh 200 mg of silica gel and fill it into the glass tube, and place it in the aging furnace for 2 hours at 180°С.

[0053] Using the above-mentioned aged adsorption tube, the prepared hydrogen sulfide (H 2 S) Standard gas 0.5 mL, 1 mL, 1.5 mL, 2 mL, 3 mL are placed in the desorption furnace, set the desorption temperature to 175?С, the desorption time is 2 min, the nitrogen purge time is set to 0.1 min, and the temperature is desorbed to 20 mL vacuum headspace bottle, extract 1mL desorbed gas into gas chromatograph (GC-FPD) equipped with flame photometric detector for analysis, and take the same volume of hydrogen sulfide (H 2 S) The standard gas is placed in a 20 mL vacuum headspace bottle, and 1 mL is drawn into a gas chromatograph (GC-FPD) equi...

Embodiment 3

[0056] Example 3: Determination of carbon disulfide volatilized from gypsum board (CS 2 ):

[0057] Take 1 m 2 Put the gypsum board into 1m 3 In the climate box, set the temperature in the climate box to 30?С and the humidity at 66%, leave it for 45 days, weigh 200 mg of Tenax-TA resin and fill it in a PTFE tube, and place it in the aging furnace at 250?С Aging for 4 h.

[0058] Take a piece of aged Tenax-TA resin and absorb the prepared carbon disulfide (CS 2 ) Standard gas 0.5mL, 2mL, 2.5mL, 3mL, 5mL are placed in the desorption furnace, set the desorption temperature to 220°С, the desorption time is 3 min, the nitrogen purge time is set to 0.16 min, and the vacuum top is desorbed at high temperature to 20 mL Empty bottle, extract 1mL desorbed gas into gas chromatograph (GC-FPD) equipped with flame photometric detector for analysis, and take the same volume of carbon disulfide (CS 2 ) The standard gas is placed in a 20 mL vacuum headspace bottle, and 1 mL is extracted into a gas ...

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Abstract

The invention relates to a detection method of trace volatile sulfides in a gypsum board. The detection method solves the problems of poor selectivity and difficulty for accurate analysis of volatile sulfides with a low concentration in present detection methods. The detection method realizes the qualitative and quantitative analysis of an object to be detected by placing a gypsum board in a climate box, keeping a constant temperature and humidity, and performing trapping by a solid adsorbent, thermal desorption, separation by a capillary column of gas chromatography, and detection by a flamephotometric detector. The detection method has the advantages of high selectivity, and high sensitivity, is especially applicable to the analysis and determination of trace volatile sulfides (hydrogen sulfide, sulfur dioxide, carbon oxysulfide, carbon disulfide) with a low concentration and multiple components, has accurate and reliable determination, and has good application prospects.

Description

Technical field [0001] The invention relates to a detection method of gypsum board, in particular to a detection method of trace volatile sulfide in gypsum board. Background technique [0002] With the development of society and economy and the continuous improvement of people’s living standards, interior decoration has become an important means for people to improve their quality of life and improve their living conditions. Some volatile pollutants derived from decorative materials are inevitably brought to people’s lives. Living space. According to statistics, modern people live and work indoors for about 80% of their time. Poor indoor ventilation makes it difficult for pollutants to spread. The problem of indoor air pollution has become increasingly prominent, which has caused serious harm to human health. [0003] Gypsum board is a kind of ceiling material widely used in urban decoration in my country. The quality of gypsum board has an important influence on the safety of ind...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/08
Inventor 魏红兵周洛王素梅陈广志马小东侯英涛高博
Owner CHEM MINERALS & METALLIC MATERIALS INSPECTION CENT OF TIANJIN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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