TY - SER AU - Marchesan,E.D. AU - Trezzi,M.M. AU - Vida,R.A. AU - Dick,D.P. AU - Xavier,E. TI - Leaching of atrazine in commercial and xerogel formuilations in oxisol using biossay and chromatographic methods KW - SOLO KW - LIXIVIAÇÃO KW - HERBICIDA KW - CROMATOGRAFIA ER -