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Endocrine Disrupters in Sewage Sludge: Analytical Method Development

Price: £20


Ref: 03/TX/04/7
ISBN: 1 84057 307 4

A performance tested analytical method has been developed to determine the natural oestrogens, oestrone and 17-b-oestradiol and the synthetic oestrogen ethinyl oestradiol in sewage sludge and soil. Samples were extracted with methanol using accelerated solvent extraction (ASE). The extracts were purified using a simple clean-up procedure utilising C18 solid phase extraction cartridges. Analysis to determine free steroid oestrogens was undertaken using liquid chromatography mass spectrometry (LCMS) operated in the negative ion electrospray mode. Performance testing of the analytical procedure at a low spike of 50 ng g-1 has provided relative percentage recoveries for each of the analytes: oestrone, 17-b-oestradiol and ethinyl oestradiol of 63-124%, 69-114% and 75-122% respectively over the range of sludge and soil samples tested. The statistically derived limits of detection of the method were in the range 25-100 ng g-1.

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