Products Cited in Publications Worldwide Concentrations, Profiles, and Potential Sources of Liquid Crystal Monomers in Residential Indoor Dust from the United States

Concentrations, Profiles, and Potential Sources of Liquid Crystal Monomers in Residential Indoor Dust from the United States

Liu, Yuan; Kannan, Kurunthachalam

DOI: PMID:

Abstract

(LCMs) are biphenyl- or cyclohexane-basedorganic chemicals used in electronic digital displays, and several of them possessbioaccumulative and toxic properties. Little is known about their occurrence in indoordust from the United States. We analyzed 60 LCMs in 104 residential indoor dustsamples collected from 16 states across the United States. Forty-seven of 60 LCMswere detected in dust samples at a median ∑LCM concentration of 402 ng/g (range:not detected to 4300 ng/g). Trans-4-propylcyclohexyl trans,trans-4’-propylbicyclohexyl-4-carboxylate (MPVBC) and (trans,trans)-4-fluorophenyl 4’-pentyl-[1,1’-bi-(cyclohexane)]-4-carboxylate (FPeBC) were frequently detected in dust samples. Weinvestigated potential sources of LCMs in dust by determining concentrations andprofiles of these chemicals in smartphone screens, desktop and laptop computermonitors, and displays of other electronic devices and found that profiles insmartphones matched closely with those found in dust. The calculated median dailyintake of ∑LCM through dust ingestion was 1.19 ng/kg bw/d for children, whereas that through dermal absorption was 0.18 ng/kgbw/d for adults in the United States.

Keywords

liquid crystal monomers ; dust ; exposure ; digital displays ; LCD

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