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Selenium (Se) was determined in soil and was adjusted to pH 1.8, and a stabili'ing plant sampies after wet digestion with HNO" agent consisting 9f l0V9 _hydroxylamine hyind HCIO.. The melhod included the usuai diochloride in a 0.04 M ED'IA solution was steps, nambly, the reduction of Se, complex-used. Fluorescence measurements obtained ing Se with 1,3-diaminonaphthalene, and the for soil samples gave average coefficie-nts ^of exiraction of'the piazseleriol in cyclohexane variation and recovery perc_entages. of 3.35 followed by fluoroimetric measurements. The and 97.4, respectively. For radioactivity_colnts most impoitant step, the stabilization of sele-made on cyclohexane extracts, the coefficients nium at the oxidative state Se*', was achieved of variation and the recovery Perceltages by reducing Se*6 to Se*t wiih 2 ml of I N were 2.31 and 93.1, respectively. Similar reficl whleltre system was kept in a boiling sults were obtained for plant materials. Maj_or water bath. Foi best resul.ts^ and adequatE problems encountered in establishing the control of interfei"ing ferric ions, the syitem modified method are discussed'

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