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Detection method of trace volatile sulfide in gypsum board

A technology for volatile sulfides and detection methods, applied in 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: 2013-05-01
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 from gypsum board:

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

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

[0049] Adsorb 0.5mL, 1mL, and 1.5mL of the prepared standard gas with the above-mentioned aged adsorption tubes, place them in the desorption furn...

Embodiment 2

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

[0052] take 2 m 2 plasterboard into 1 m 3 In the climate box, the temperature in the climate box was set at 28°С, the humidity was 60%, and it was placed for 10 days. 200 mg of silica gel was weighed and filled in a glass tube, and placed in an aging furnace at 180°С for aging for 2 hours.

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

Embodiment 3

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

[0057] take 1 m 2 The gypsum board put into 1m 3 In the climate box, set the temperature in the climate box to 30°С, the humidity to 66%, place it for 45 days, weigh 200 mg Tenax-TA resin and fill it in a polytetrafluoroethylene tube, and place it in the aging furnace at 250°С Aged for 4 h.

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

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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 for gypsum boards, in particular to a detection method for trace volatile sulfides in gypsum boards. Background technique [0002] With the development of social 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 from decorative materials are inevitably brought to people's Living space. According to statistics, modern people spend about 80% of their time living and working indoors. Due to poor indoor ventilation, it is difficult for pollutants to diffuse. The problem of indoor air pollution is becoming more and more serious, which has posed a serious hazard 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 impact on the safety o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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