Analytical Notes
62 Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide
Ensure samples, reagents and standards are at room temperature
prior to analysis. The VGA 77 pump will not operate correctly with
hot or cold solutions as the pumping rate may vary with solution
temperature.
Sources (AA only)
Hollow cathode lamps or UltrAA lamps can be used for all VGA 77
methods for AA analysis.
Basic Methods
The hydride-forming elements may exist in more than one oxidation
state in samples and standards. (See Page 57.) The following
analytical methods for sample and standard have been developed to
ensure samples and standards are present in the correct oxidation
state.
Antimony
Prepare samples in at least 1 M hydrochloric acid and ensure that
any analyte present as Sb
V
is reduced to Sb
III
by the action of
potassium iodide at a concentration of 1% w/v. Reduction is
spontaneous and heating should not be required.
Reductant container: NaBH
4
0.6% w/v,
NaOH 0.5% w/v
Acid container: 5 to 10 M HCl
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