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STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES <br /> TOXIC SUBSTANCES CONTROL PROGRAM <br /> TOXICOLOGY AND RISK ASSESSMENT UNIT <br /> SCIENTIFIC GUIDANCE MEMO 89-3 <br /> AUGUST 9, 1989 <br /> Page 6 of 8 <br /> Table 1. Concentration of polychlorinated-p-dibenz <br /> odioxin arra <br /> polychlorinated dibenzof=m contaminants in technical <br /> grade and EC-7 grade pentachlorophenol test articles <br /> enployed in the NIP studies of the carcinogenic effects <br /> of pentachlorophenol. <br /> Concentration in Concentration in <br /> Technical Grade EC-7 Grade <br /> Contaminarâ–ºt <br /> PCP (PPm) PCP <br /> ND ND <br /> 2,3,7,8-TCDD ND ND <br /> X,2,3,7,9-PeCDD 10.9 ND <br /> X,2,3,7,8-HxCDD 1.9 <br /> X,2,3,7,8-HpCDD 182.0 ND <br /> OCDD 970.0 <br /> 0.063 ND <br /> 2,3,7,8-TCDF ND <br /> 0.1-4 <br /> X,2,3,7,9- ^FND <br /> 2,3,4,7,6-TcDF 0.31 ND <br /> X,2,3,7,8-HXCDF 1.59 0.07 <br /> X'2'3'7'8-HpCDF 22.4 ND <br /> NDOCDF <br /> T = tetra Hx = hexa CDD = chlorodibenzo-g-=-'oxin <br /> Pe = pen,-.a Y,p = hepta CDF = chiorodibenzofuran <br /> X = chlorine(s) in any position <br />