You may check for its possible interest: "Extraction of Ethylene Glycol from Aqueous Samples", Application Note: U-PP-EthyleneGlycolAqueousSamples-10V1-E-ET-GLYCL, Avantor Performance Materials Inc., 2012; http://www.avantormaterials.com/Technical/Technical-Literature-Library/Laboratory-Application-Notes.aspx
Also possibly useful is the following NIOSH protocol: National Institute for Occupational Safety and Health (NIOSH): Manual of Analytical Methods (NMAM®), 4th ed., 1994, Supplement Publication Nº 1, 15 May 1996, Method 5523: Glycols (by S.M. Pendergrass), 5 pp.; http://www.cdc.gov/niosh/docs/2003-154/pdfs/5523.pdf
Yet of possible interest for the intended application, albeit focusing the closely related diethylene glycol rather than ethylene glycol, might be: A. Cappiello, G. Famiglini, P. Palma, V. Termopoli, H. Trufelli, R. Di Mento, M. Mannozzi, “LC–ESI-MS determination of diethylene glycol pollution in sea water samples collected around gas extraction platform plants”, Talanta, 80(1), 2009, 257–262; http://www.sciencedirect.com/science/article/pii/S003991400900527X
You may further consider solid phase extraction of glycols using Supelco’s ENVI-Carb™ Plus cartridges:
Supelclean™ ENVI-Carb™ Plus ─ Data Sheet, Ref. T708003, Sigma-Aldrich, 2008; https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Supelco/Product_Information_Sheet/t708003.pdf
L.M Sidisky, K.K. Stenerson, W.R. Betz, M.J. Keeler, M. McCoy, J. Brown; “The Extraction of Glycols From Water Using ENVI-Carb™ Plus Solid Phase Extraction Cartridges”, Doc. T410135, Sigma-Aldrich, 2010; https://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Supelco/Posters/1/t410135h.pdf; K.K. Stenerson, W.R. Betz, M.J. Keeler, S.P. Cecil; Idem; Sigma-Aldrich, 2010; http://www.epa.gov/region6/qa/presentations10/c10-cecil-p.pdf
Katherine K. Stenerson, ENVI-Carb Plus for the Extraction of Propylene Glycol and Ethylene Glycol from Water, Reporter US ─ Supelco Chromatography Newsletter, Vol./Nº 28.3, 2010: http://www.sigmaaldrich.com/content/dam/sigma-aldrich/articles/reporter-us/pdf/envi-carb-plus-for.pdf