... *Division of Environmental Chemistry, National Institute of Health Sciences, Kamiyoga 1-1 8-1 , Setagaya-ku, Tokyo 15 8-8 501, Japan ABSTRACT Japan’s recommended method of EDTA determination ... efficiency, solid-phase extraction was performed as described below. Journal of Water and Environment Technology, Vol. 8, No.4, 2010 - 350 - Table 1 - Recovery of EDTA from Milli-Q water and ... SPE-derivatization-GC/MS method to the Japanese Standard Methods for the Examintion of Water would be to perform an inter-laboratory validation study of the proposed method. Determination of...