National Research Council of Canada. NRC Institute for National Measurement Standards
A new hydride generator has been characterized for use with the acid−NaBH4 hydride generation systems based on the insertion of a capillary tube into the sample introduction channel of a standard Meinhard nebulizer. The acidic sample and the tetrahydroborate solution are mixed at a merge point 1.5 cm from the end of the nebulizer orifice. Nebulization of the reaction solutions into a 0.7 mL tubular “spray chamber” follows a very short mixing time (less than 0.012 s) of the reagents. This approach permits 10 000 μg/mL Ni2+ or Cr3+ to be present in the sample solution without producing any interferences. Additionally, in the presence of Fe3+ added as a “releasing agent”, 5000 μg/mL Co2+ or 160 μg/mL Cu2+ can also be tolerated without interference. An 80 ± 2% generation efficiency is attained for the test element selenium. A detection limit of 6 μg/L (3σb) is achieved with ICP-AES detection. Precision of replicate measurements at the 12 μg/L level varies from 5 to 12% relative standard deviation.
Analytical Chemistry69, no. February 1 3 (1997): 527–531.