A rapid low-consuming solvent extraction procedure for simultaneous determination of 34 multiclass pesticides associated to respirable atmospheric particulate matter (PM2.5) by GC-MS

作者：Nascimento Madson Moreira; da Rocha Gisele Olimpio; de Andrade Jailson Bittencourt^*

来源：Microchemical Journal, 2018, 139: 424-436.

DOI：10.1016/j.microc.2018.03.023

• Green analytical chemistry
• Multiclass pesticides
• GC-MS
• Atmospheric particulate matter
• PM2.5

A miniaturized and low-consuming solvent extraction procedure has been developed for the simultaneous determination of 34 multiclass pesticides in PM2.5 samples, using sample masses as low as 321 mu g. A central composite design was applied in order to establish the optimal extraction conditions: the solid-liquid extraction was done under sonication using 500 mu L. of a solvent mix 70/30 acetonitrile/ethyl acetate and an extraction time of 17 min at 39 degrees C. It was followed by injection in a GC-MS system. Recoveries ranged from 72.1% (endrin aldehyde) to 120% (sulfotep) with RSD <= 20% for most of pesticides. The method accuracy was assessed by determinations of organochlorine pesticides such as 4,4'-DDT, 4,4'-DDE and 4,4'-DDD in NIST SRM 1649b. PM2.5 samples were collected in Salvador city, State of Bahia-Brazil. 25 pesticides were successfully identified and quantified, among them organophosphates prohibited by European Union and some banned organochlorine. The average concentrations ranged from 0.88 pg m(-3) (aldrin) to 255 pg m(-3) (endrin aldehyde). Malathion, chlorpyrifos, 4,4'-DDE, endrin aldehyde, lambda-cyhalothrin and permethrin were detected with frequencies above 50%. This procedure was found to be comprehensive, precise, accurate and suitable to be employed for determination of pesticides associated to respirable atmospheric particulate matter.

• 出版日期2018-6