简介:2.1 Samples are prepared according to the nitric/sulfuric acid digestion
procedure described in this method (Step 7.1). Next, the arsenic in the
digestate is reduced to the trivalent form with tin chloride. The trivale简介:2.1 Samples are prepared according to the nitric/sulfuric acid digestion
procedure described in this method (Step 7.1). Next, the arsenic in the
digestate is reduced to the trivalent form with tin chloride. The trivalent
arsenic is then converted to a volatile hydride using hydrogen produced from a
zinc/hydrochloric acid 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
absorption of the lamp radiation is proportional to the arsenic concentration.
2.3 The typical detection limit for this method is 0.002 mg/L.详细>