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SPE materials Spiked concentration of E2,  mg L-1 Detected concentration of E2, mg L-1 Recoveries
MIP 1.0±0.16 0.98±0.02 98±2
NIP 1.0±0.14 0.24±0.03 19±4
XAD 1.0±0.18 0.36±0.04 9±6
PAC 1.0±0.15 0.14±0.06 15±9

Table 2. Recoveries of MIP and other SPE materials

SPE, Solid phase extraction; E2, 17ß-estradiol, Standard 1.0 ?g L-1 of E2 solution prepared using Milli-Q water pH, 7.2±0.3