Journal
ANALYTICA CHIMICA ACTA
Volume 582, Issue 2, Pages 353-360Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2006.09.012
Keywords
phthalates; di(2-ethylhexyl)phthalate; dibutyl phthalate; blank problem; absorption from the air; aluminium oxide for cleaning solvent
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The analysis of phthalates, particularly that of di(2-ethylhexyl)phthalate (DEHP) and dibutyl phthalate (DBP), is notorious for blank problems. Methods and tools are listed to identify the sources and reduce the system contamination to below 1 pg DEHP and DBP or below 1 ng mL(-1) of sample solution. Once direct contact with phthalate-containing plastic articles is ruled out, the air is the major source, primarily via absorption to the surfaces of laboratory glass ware. A main improvement was achieved by cleaning solvents with aluminium oxide permanently left in the reservoirs. The data enables to estimate the contamination to be expected and to design methods keeping blanks below a critical threshold. (c) 2006 Elsevier B.V. All rights reserved.
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