EQS 17β-estradiol 17a-ethinyl-estradiol 0.4 ng/L 35 pg/L

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EQS 17β-estradiol 17a-ethinyl-estradiol 0.4 ng/L 35 pg/L in coastal waters 80 pg/L 7 pg/L The best results in analysis of estrogens and progestogens have been achieved with liquid chromatography tandem mass spectrometry (LC-MS-MS); Sample preparation clean–up is important in reducing matrix interferences and plays a significant role in enhancing sensitivity; In several studies, derivatization improved the sensitivity of LC-MS detection. LOQ achievable with 1 L extraction and a top LC-MS-MS instrument: 0.1 – 0.5 ng/L If a lower LOQ could be achieved with a 10 L extraction has to be investigated Test large-volume injection (100 µL) Tomsikova et al., Trends in Analytical Chemistry 34 (2012) 35-58. JRC report, 2012