Determination of booster biocides in sediments by focused ultrasound-assisted extraction and stir bar sorptive extraction–thermal desorption–gas chromatography–mass spectrometry

摘要: Abstract Booster biocides present in natural waters may be captured by the sediments. Highly sensitive, robust, selective and reliable analytical methods are required to evaluate their presence A focused ultrasound assisted extraction method for simultaneous determination of five organic booster (Chlorothalonil, Dichlofluanid, Sea-Nine 211, Irgarol 1051 TCMTB) marine sediments is proposed. The isolation target compounds from 0.5 g sediment was efficient using 2.5 mL methanol as solvent, an output amplitude 50 W, 100% duty cycle time 300 s. procedure followed solid-phase clean-up on non-polar sorbents (Oasis HLB). were sampled stir bars (20 mm length, 0.5 mm film thickness) coated with polydimethylsiloxane (PDMS). stirred at 900 rpm 3 h room temperature. Desorption carried out thermal desorption (TD), analytes separated gas chromatography (GC). They detected triple quadrupole mass spectrometry (MS/MS) multiple reaction monitor (MRM) mode. detection limits (DLs) range 0.02 2.2 ng g − 1 dry weight. regression coefficients higher than 0.999. average recovery 86% (R.S.D.: 7–11%). applied port samples southwestern Spain. 211 found one a level 2.1 ng g−1. all concentrations between 2 9 ng