Table 2.2 Concentrations of Triclosan (TCS), TCS-OMe, Tetra II, Tetra III and Penta chloro-hydroxydiphenylethers in wastewater and sludge samples collected at the activated sludge treatment plant (AS) in Loveland and the trickling filter treatment plant (TF) in West Union (McAvoy et al. 2002) TCS TCS-OMe Tetra II Tetra III Penta Sludge type Influents, effluents: µg/L; sludge: µg/g (dry weight) Loveland (AS) Raw influent 10.70 n.q. ^a (0.03) ^b 0.08 0.05 Primary effluent 7.00 n.q. 0.04 0.08 0.05 Final effluent 0.41 n.q. n.d. ^c (0.03) n.d. Primary sludge 14.70 0.05 0.04 0.10 0.07 Secondary sludge 4.20 1.03 0.06 0.04 0.09 West Union (TF) Raw influent 15.4 n.q. 0.62 0.25 0.19 Primary effluent 8.00 n.q. 0.34 0.16 0.16 Secondary effluent 2.70 n.q. 0.29 0.07 0.07 Primary sludge 12.20 0.14 0.07 0.12 0.12 Secondary sludge 7.30 0.45 0.09 0.05 0.08 Aerobic digested sludge 1.50 0.13 n.d. n.d. n.d. a: n.q., below limit of quantification. The limit of quantification was 0.1 µg/L and 0.07 µg/g for wastewater and sludge samples, respectively. b: Values in parentheses were below the limit of quantification, hence these are approximate concentrations. c: n.d., below limit of detection. The detection limit was 0.01 µg/L and 0.04 µg/g for wastewater and sludge samples, respectively.