顶空箭型固相微萃取/气相色谱-三重四极杆质谱法同时测定地表水中64种异味物质OA

To address the odor issue in surface water,a method for the simultaneous determination of 64 odor-causing substances in surface water was established based on headspace arrow solid-phase microextraction coupled with gas chromatography-triple quadrupole mass spectrometry(HS-SPME Arrow/GC-MS/MS).The targeted odor-causing substances cover multiple categories,including typi‑cal algal-derived and industrial-derived ones such as sulfides/thiols,halohydrocarbons/aromatic hy‑drocarbons,terpenes,pyrazines,esters,phenols,aldehydes and ketones,ethers,and amines.Single-factor experiments were conducted to investigate the effects of parameters,including SPME fi‑ber type,extraction time,extraction temperature,incubation time,and sodium chloride(NaCl)addition amount,on the extraction efficiency of the 64 odor-causing substances.The results indicat‑ed that the optimal conditions were as follows:after introducing 1.80 g NaCl to 5.0 mL solution,the bottle was incubated for 5 min at 60℃,then a DVB/CAR/PDMS(divinylbenzene/carboxen/polydimethylsiloxane)SPME fiber was used for the extraction for 30 min.The limits of detection for the 64 odor-causing substances ranged from 0.92 to 29.06 ng/L,with all linear correlation coeffi‑cients(r2)greater than 0.990 in the linear range of 5.0-2 000 ng/L.At three spiked concentration levels,the average spiked recoveries ranged from 60.1%to 134%,and the relative standard devia‑tions(RSDs)varied between 1.8%and 21%.When this method was used to detect 5 surface water samples from Shanghai,methyl sulfide(5.13-18.04 ng/L),methanethiol(6.58-25.12 ng/L),and 2-methylisoborneol(2-MIB,11.13-11.42 ng/L)were detected,respectively.This method is charac‑terized by automated sample pretreatment,and can be applied to the high-throughput rapid screening of odor-causing substances in surface water.