ORIGINAL RESEARCH
Optimization of Solid-Phase Extraction
for Pretreatment of Selected Estrogens in Sewage
by Response Surface Methodology
Xiao-Li Yang1, Ming-Qian Xia1, Ming Chen1, Dan-Qun Shen1,
Da-Fang Fu1, Hai-Liang Song2
Pol. J. Environ. Stud. 2014;23(6):2287-2294