In the run, I have a standard of a known purity, a standard check, and my samples. Run time is 10 min and the preparation is simply dissolving standards and samples in MeOH and sonicate for two min. But I am receiving higher results?
Sometimes BHT is added to chemicals as an antioxidant, the first thing I would do is check that out.
Due to their massive use in a lot of products (plastics, cosmetics, pharmaceuticals, rubber and so on) BHT as well as other compounds like phthalates, could be detected even in indoor dust and as indoor air pollutants, making them ubiquitary contaminants.
Repeated rinsing procedures with acetone, n-hexan, acetonitrile and following heating process of glassware, could reduce the starting contamination of labware surfaces.
Some references:
Nilsson et al., 2005, Quantitative determination of volatile organic compounds in indoor dust using gas chromatography-UV spectrometry, Environment International.
Fernandez-Alvarez et al., 2009, Photo-solid-phase microextraction of selected indoor air pollutants from office buildings. Identification of their photolysis intermediates, Journal of Chromatography A.
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