gas chromatograph mass spectrometer GC-MS Model：7890A-5975C
Performance indicators: the quality of the scanning range: u 1-1050; scan rate: 12500 u/s; sensitivity: 1uL concentration of 20pg/uL of eight samples of, m/z272 ion signal to noise ratio of 10:1.
The main principle: the separation of the sample with high efficiency separation characteristics of the sample into a pure substance (Quantitative), and then the pure substance into mass spectrometry, can be used to analyze the molecular formula of organic matter, the chemical structure (Qualitative).
Testing physical and chemical group: including n-alkanes, polycyclic aromatic hydrocarbons, fatty acids, fatty alcohols, sugars, phthalate, phthalic acid ester, hopanes and some other polybasic acid / polyol.
Sample requirements and test methods: according to the polarity or non polarity characteristics of the target compounds, a certain amount of organic solvent is used to extract the target components of the aerosol. Direct filtration with a silane glass wool or a Teflon filter head, remove the insoluble particles in the extract and filter the membrane fragments. The extraction solution before use rotary evaporator was preliminarily concentrated under vacuum, and then continue to use nitrogen blowing instrument to dry. Addition of N, o-bis (trimethylsilyl) trifluoroacetamide (BSTFA): trimethylchlorosilane (TMCs) (99:1 mixture, in 70 DEG C under the condition occurs the derivatization reaction. Finally, after adding a certain internal standard compound to be measured. Mainly test aerosol samples.
The test precision: after pretreatment of the sample concentration was 1ng/ l best test effect.
GC-MS Model：7890A-5975C