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From: Organophosphate esters in tree bark and human hair in Weifang and Yantai, Shandong Province, China: concentrations, profiles and sources

Figure 3. Chlorinated and non-chlorinated organophosphate ester (OPE) concentrations in hair samples from residents of Weifang (WF) and Yantai (YT) grouped by the residents’ ages. (Weifang, < 20 years (n = 8), 20 years-39 years (n = 13), and 40 years-60 years (n = 5); Yantai, < 20 years (n = 9), 20 years-39 years (n = 12), and 40 years-60 years (n = 12)). TCEP: Tris(2-chloroethyl)phosphate; TCPP: tris(2-chloroisopropyl)phosphate; TDCPP: tris(2,3-dichloropropyl)phosphate; TEP: tris(2-ethylhexyl)phosphate; TNBP: tris(n-butyl)phosphate; TPHP: triphenyl phosphate; TOCP: tris(o-cresyl)phosphate; TMCP: tris(m-cresyl)phosphate; TPCP: tris(p-cresyl)phosphate.