The sodium borohydride alkaline
solutions were prepared daily by dissolving the appropriate amounts of the solids
NaBH4 (Merck). Hydrochloric acid (Merck, Darmstadt, Germany) was used to prepare
the carrier 3% v/v HCl solution and Argon was used as the carrier gas. The
method was validated by certified reference materials, NRCC DORM-2 (Dogfish
Muscle), obtained from the National Research Council of Canada (Ottawa, Ontario
Canada). To avoid metal contamination, all glassware and plastic wares were kept
for 48 h in 10% (v/v) nitric acid, and then rinsed several times with ultra pure water
before use.
The sodium borohydride alkalinesolutions were prepared daily by dissolving the appropriate amounts of the solidsNaBH4 (Merck). Hydrochloric acid (Merck, Darmstadt, Germany) was used to preparethe carrier 3% v/v HCl solution and Argon was used as the carrier gas. Themethod was validated by certified reference materials, NRCC DORM-2 (DogfishMuscle), obtained from the National Research Council of Canada (Ottawa, OntarioCanada). To avoid metal contamination, all glassware and plastic wares were keptfor 48 h in 10% (v/v) nitric acid, and then rinsed several times with ultra pure waterbefore use.
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