by Nguyen Thai Hoa,  Joachim Clemens and Le Thi Anh Hong.
 The first                                           			results indicate that waste  water, from some industry waste water and from piggeries are                                           			sources of endocrine  disruptors. Background concentrations seem to be around and less 1                                           			ng/L E2 equivalents (Figure  1).

 Figure 1: Concentration of E2 equivalents in  selected areas.