The gas chromatographic determination of selenium(IV) and total selenium in natural waters with 1,2-diamino-3,5-dibromobenzene

摘要: Abstract The total selenium and selenium(IV) contents in sea water river can be determined directly by a gas chromatographic method with l,2-diamino-3,5-dibromobenzene without preconcentration. reagent reacts only to form 4,6-dibromopiazselenol; other oxidation states of must therefore converted the tetravalent state for determinations. piazselenol formed extracted quantitatively into 1 ml toluene from 500 sample water. A is proposed determination natural waters at levels as low 2 ng l -1 . Coastal Japan contain 8–30 Se(IV) 20–50 Se per liter.