Add time:07/14/2019         Source:sciencedirect.com

We developed an analytical method to simultaneously determine 2,6-di-tert-butyl-hydroxytoluene (BHT) and its four transformation products in indoor dust and sediment samples. BHT, 2,6-di-tert-butylcyclohexa-2,5-diene-1,4-dione (BHT-Q), and 3,5-di-tert-butyl-4-hydroxybenzaldehyde (BHT-CHO) were measured by gas chromatography–mass spectrometry (GC–MS) after ultrasonic extraction with hexane/dichloromethane (1:3), while 2,6-di-tert-butyl-4-(hydroxymethyl) phenol (BHT-OH) and 3,5-di-tert-butyl-4-hydroxybenzoic acid (BHT-COOH) were derivatized using N, O-bis (trimethylsilyl) trifluoroacetamide before GC–MS analysis. The limits of detection (LODs) and quantification (LOQs) of the developed method were 0.02–0.34 and 0.08–1.14 ng g− 1. The recoveries for BHT and its transformation products were 71.1–118% with relative standard deviations < 10.6% at different spiking levels. The method was applied to indoor dust and sediment samples, showing that BHT was found in all samples with concentrations being 0.22–47.37 μg g− 1 in dust and 0.09–6.93 μg g− 1 in sediment. BHT-Q was the dominant transformation product, followed by BHT-CHO, BHT-OH, and BHT-COOH. Different metabolite profiles for BHT indicated various transformation pathways, making it necessary to study their transformation mechanism and environmental behaviors in the future studies.

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