Indoor air detection (five items) instrument configuration
The main source of total volatile organic compounds, TVOC, is outdoor, mainly from fuel combustion and transportation: indoors are mainly from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, construction and decorative materials, furniture, Household appliances, detergents and emissions from the body itself. There are nearly a thousand. In the interior decoration process, VOC is mainly from paints, coatings and adhesives. It is reported that the indoor TVOC concentration is usually between 0.2mg/m3 and 2mg/m3, and even in the improper decoration construction, it can even be dozens of times higher. Many indoor aromatic hydrocarbons and alkanes are mainly derived from automobile exhaust (76%-92%). The typical paint towel TVOC content is 0.4-1. mg / cubic meter. Li Li et al pointed out that because TVOC has strong volatility, in general, 90% of the paint can be volatilized within 10 hours after the construction, while the TVOC in the solvent only releases 25% of the total amount in the paint drying process. Since benzene and benzene are important components of TVOC, some people only detect TVOC, not benzene, and benzene: however, only total benzene is detected, not TVOC: there are some units, both Detection. This mainly depends on the requirements and conditions. The technical equipment for detecting TVOC is relatively high, and gas chromatography is usually used, but Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography and reflection interference spectroscopy are also used. They all appear at trace levels and trace levels and are therefore easily overlooked. They are mainly from: organic solutions: such as paints, aqueous coatings, adhesives, cosmetics, detergents, quilting; building materials: such as wood-based panels, foam insulation, plastic sheets; interior materials: such as wallpaper, other Decorations, etc.; fiber materials: such as carpets, tapestries and chemical fiber curtains; incomplete combustion of household fuels and tobacco leaves, human waste. The detection principle of TVOC is to collect a certain volume of air sample with TenaxTA as the adsorbent TVOC adsorption tube, and the volatile organic compounds in the air stream remain in the adsorption tube. After sampling, the adsorption tube is heated to absorb volatile organic compounds, and the sample to be tested enters the capillary gas chromatograph with an inert carrier gas. After capillary separation under certain conditions, FID detection, workstation recording spectra and data, qualitative time, peak height or peak area quantitation.
Indoor gas environment (TVOC) detection dedicated gas chromatograph configuration scheme:
equipment name | Models and Specifications | unit | Quantity |
Gas Chromatograph (optional) | Host + FID + filling system + capillary system | station | 1 |
Host + FID + filling system Host + FID + capillary system | station | 2 | |
Chromatography workstation | TVOC dedicated version Dual channel | station | 1 |
Air generator | HS-3 0～3000ml/min | station | 1 |
Hydrogen generator | HS-300 0～300ml/min 99.999% | station | 1 |
nitrogen bottle | High purity nitrogen 99.999% with pressure reducing valve | set | 1 |
Thermal desorber | ATDS-6000 direct injection | station | 1 |
Multifunctional desorbent activation device | TDS-3410A desorber activation and standard sample and sample machine | station | 1 |
Spectrophotometer | Detection of formaldehyde and ammonia | station | 1 |
Measuring instrument | Continuous measurement | station | 1 |
Dual gas path atmospheric sampler (optional) | 0.1～1.5L/min; continuous adjustable timing: 1～99min | station | 1 |
Constant current sampling flow: 0.4~0.6L/min | station | 1 | |
Constant current working flow range: 100～500ml/min | station | 1 | |
Empty box pressure gauge | Pressure gauge | station | 1 |
thermometer | Temperature and humidity | station | 1 |
Digital blast drying oven | 350×350×350 | station | 1 |
Quartz double distilled water meter | Ammonia free | station | 1 |
Electronic balance | Accuracy: 0.1mg; weighing range: 200g | station | 1 |
Sample box | Packing equipment such as absorption tube and sampling tube; equipped with aluminum alloy bracket | One | 1 |
TVOC dedicated column | 0.32mm*50m*1u | support | 1 |
Benzene special column | 3mm*2M | support | 1 |
Tenax adsorption tube | 200mg 50pcs/box (quantity optional) | box | 1 |
Activated carbon sampling tube | 50 sticks/package (quantity optional) | package | 1 |
Bubble absorber | 10ml (optional) | support | 1 |
Glass plate absorber | 10ml (optional) | support | 1 |
TVOC standard | 10, 100, 1000ug/ml | set | 1 |
Benzene standard solution | 2ml | support | 1 |
Benzene standard gas | 2L 5 component | bottle | 1 |
Phenol reagent | 5g | bottle | 1 |
Formaldehyde solution | 20ml 100mg/L or 2ml 10.2mg/ml | support | 1 |
Ammonia solution | 20ml 500mg/L | support | 1 |
PCR System,Quantitative PCR Machine,Pcr Analyzer,Quantitative PCR System
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