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Six, analysis and testing
(1) Instrument conditions (for reference only, can be adjusted appropriately according to the actual instrument)
1.
Adsorption trap model: use 1/3Tenar, 1/3 silica gel, 1/3 activated carbon mixed adsorbent or other equivalent adsorbents; furnace valve temperature: 140℃; transfer pipeline: 140℃; water heating temperature: 80℃; solid valve Temperature: 100℃; Purge time: 11min; Purge flow: 40mL/min; Dry blow time: 2min; Dry blow flow: 100mL/min; Needle wash volume: 7mL; Desorption temperature: 250℃; Desorption time: 3min; Baking time: 5min; Baking temperature: 260℃; Baking flow rate: 200mL/min
2.
Injection port: temperature is 250℃, column flow is 2.
HP-VOC, 60mm×0.
3.
Ion source: EI, ion source temperature 230℃, ionization energy 70eV, scanning range: 35~270amu
The instrument conditions are also suitable for HJ605-2011 "Determination of Volatile Organic Compounds in Soils and Sediments by Purge and Trap Gas Chromatography-Mass Spectrometry"
(2) Retention time and standard curve
1.
Add 5mL ultrapure water to a 40mL purge and trap bottle, and prepare a standard series of more than 5 points (such as 5.
Quantify by internal standard method to obtain binary linear regression curve or average relative correction factor, qualitative and quantitative ions for each compound, see Table 4-4 for details
2.
Add 5g of pure quartz sand and 5mL of ultrapure water to a 40mL purge and trap bottle, and prepare a standard series of more than 5 points (such as 5.
Quantify by internal standard method to obtain binary linear regression curve or average relative correction factor of each compound, qualitative and quantitative ions, see Table 4-4 for details
Table 4-4 Retention time and qualitative and quantitative reference ions
Related Links: Determination of Volatile Halogenated Hydrocarbons in Solid Waste 35 VOCs Purge and Trap/Gas Chromatography-Mass Spectrometry (1)
