Organophosphate and phthalate esters in Standard Reference Material 2585 “Organic Contaminants in House Dust” Caroline Bergh 1 , Giovanna Luongo 1 , Stephen Wise 2 and Conny Östman 1 * * Corresponding author E-mail: conny.ostman@anchem.su.se Fax: +46 8 156391 1 Department of Analytical Chemistry Stockholm University 106 91 Stockholm Sweden 2 Analytical Chemistry Division National Institute of Standards and Technology Gaithersburg, MD 20899-8390 # of words: 201 (Abstract) # of words: 3656 (Introduction - Conclusions) Keywords: Organophosphate esters, phthalate esters, Standard Reference Material 2585, Organic Contaminants in House Dust, NIST.