简介:2.1 Samples are prepared according to the nitric/sulfuric acid digestion
procedure described in this method. Next, the selenium in the digestate is
reduced to Se(IV) with tin chloride. The Se(IV) is then converted to a简介:2.1 Samples are prepared according to the nitric/sulfuric acid digestion
procedure described in this method. Next, the selenium in the digestate is
reduced to Se(IV) with tin chloride. The Se(IV) is then converted to a volatile
hydride with hydrogen produced from a zinc/HCl or sodium borohydrate/HCl
reaction.
2.2 The volatile hydride is swept into an argon-hydrogen flame located
in the optical path of an atomic absorption spectrophotometer; the resulting
absorbance is proportional to the selenium concentration.
2.3 The typical detection limit for this method is 0.002 mg/L.详细>