Table 6 Water samples, procedural controls: expected and measured EEQ
From: Estrogenic activity in drainage water: a field study on a Swiss cattle pasture
Sample | Procedural control processed with SPE | SPE processed vol. (l) (conc. factor) | Expected EEQ (ng/l) | EEQ (ER-CALUX) ± MU (ng/l)a | EEQ (YES) ± SD (ng/l)b |
|---|---|---|---|---|---|
K1-0705 | HPLC-grade water | 0.991(1713 x) | 0 | <LOQ (0.016) (LOD 0.008) | n.d. |
K2-0705 | HPLC-grade water, spiked to 2 ng/l with E2 | 0.967(1672 x) | 2 | 0.75 ± 0.195 (LOD 0.008) | 1.72 ± 0.78 |
K3-0705 | 9:1 HPLC-grade water : acetone | 0.350(601 x) | 0 | <LOQ (0.079) (LOD 0.008) | n.d. |
K1-0306 | HPLC-grade water | 0.977(1656 x) | 0 | 0.035 ± 0.009 (LOD 0.008) | n.d. |
K2-0306 | HPLC-grade water, spiked to 2 ng/l with E2 | 0.843(1425 x) | 2 | 0.45 ± 0.117 (LOD 0.008) | 1.81 ± 0.15 |
K1-0107 | HPLC-grade water, spiked to 2 ng/l with E2 | 0.838(1425 x) | 2 | 1.3 ± 0.338 (LOD 0.008) | 1.91 ± 0.05 |
K1-0809 | HPLC-grade water, spiked to 10 ng/l with E2 | 0.992(1993 x) | 10 | 5.5 ± 1.43 (LOD 0.013) | 20.1 ± 0.7 |
K2-0809 | HPLC-grade water, spiked to 2 ng/l with E2 | 0.996(1996 x) | 2 | 0.77 ± 0.2 (LOD 0.013) | 2.83 ± 0.18 |
K3-0809 | HPLC-grade water, spiked to 2 ng/l with E2 | 0.995(2003 x) | 2 | 0.8 ± 0.208 (LOD 0.013) | 1.42 ± 0.1 |