The derivative SPME-GCMS was used to detect acetaldehyde in bottled water

Determination of acetaldehyde in bottled water by SPME-GC/MS derivatization

Qingdao Zhenzheng Analytical Instrument Co., LTD. Technical department

SPMEProbe item number：ZZ-SPME-06-s

Analysis condition:

Derivatization reagent: 5 mg/ml aqueous solution of pentafluorobenzene amide hydrochloride (PFBOA)

Sample: Take 10 ml water sample into 20 ml headspace bottle, add 10 µl derivative reagent, so that the concentration of derivative reagent in the sample is 5 µg/ml

Extraction temperature: 50 ºC; Extraction time: preheat 5 min, extraction 30 min; Vibration speed: 250 rpm

Desorption time: 2 min; Desorption temperature 250 ºC

Inlet temperature: 250 ºC, shunt ratio 20:1

Carrier gas: helium, flow rate 1 ml/min

Chromatographic column: Aglient DB-5MS 30 m × 0.25 mm × 0.25 µm

Programmed temperature rise: 40 ºC for 2 min, 10 ºC/min to 200ºC, 20 ºC/min to 280 ºC for 1 min

MS conditions: EI ionization source, full scan mode, scanning range 50-500 m/z, ion source temperature 230 ºC

The quadrupole temperature is 150 ºC

Derivatization SPME-GC/MS total ion flow chromatogram

Acetaldehyde reacted with derivatization reagent to produce two kinds of large molecular weight isomer derivatization substances, which were extracted by solid phase microextraction probe and directly injected into gas chromatograph. Give two peaks in a certain proportion.

 +   =   +

Linear range, linear correlation coefficient, minimum detection limit and repeatability.