Vapor Generation Accessory VGA–77 Operation manual

VGA–772. For the determination of arsenic and selenium in many practicalsamples containing high concentrations of metals such as copper,iron or nickel, fewer interferences have been observed using 0.3%w/v NaBH 4solution concentration (rather than 0.6% w/v). Use ofthe lower reductant concentration may, however, be less sensitive.3. You can minimize interferences of transition metals such ascobalt, copper, iron, and nickel on arsenic and selenium bypreparing samples in 6-7 M HCl. With lower acid concentrations,greater inter-element interferences are present.4. Co-precipitation methods using lanthanum compounds have alsobeen found to be useful.4.4.9 References1. Smith, A.E., ‘Interferences in the determination of elements thatform volatile hydrides with NaBH 4using AAS and Ar/H 2flame.’,Analyst, May, 1975, 100, 300-3062. Varian AA-at-Work, 1992, October, No. 1074.4.10 Additional referencesThe following references are recommended:Varian Instruments At WorkNumbers AA - 38, 44, 50, 51, 56, 60, 65, 78, 82, 86, 87, 105, 107Spectroscopy, 1985, Vol 1 (0), 60Appl. Spectrosc., 1985, Vol 39 (1), 48Jiri Dedina and Dimiter L. Tsalev, Hydride Generation AtomicAbsorption Spectrometry. Published by John Wiley and Sons, Editedby J.D. Winefordner. ISDN 0 471 9536444-12 Publication date: May 2004