Agilent Technologies VGA 77 User Manual

Analytical Notes
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide 67
Se
VI
is not quantitatively recovered by hydride generation and must
be reduced to Se
IV
by warming with concentrated hydrochloric acid.
Prepare the samples in 6-7 M hydrochloric acid (use of a lower acid
concentration will result in greater inter-element interferences), heat
at 70-90 °C for at least 10 minutes. Cool to room temperature before
analysis.
Reductant container: NaBH
4
0.6% w/v
NaOH 0.5% w/v
Acid container: 10 M HCl
Tellurium
The presence of potassium iodide will severely suppress the
analytical response. Always ensure that the VGA 77 system is
completely free of potassium iodide before performing tellurium
determinations.
NOTE
To avoid contamination, it is recommended that you dedicate a separate module
to the analysis of those elements requiring pre-reduction with KI (ie., As or Sb).
Te
VI
is not quantitatively recovered by hydride generation and must
be reduced to Te
IV
. Prepare the samples in 6-7 M hydrochloric acid,
heat at 70-90 °C for at least 10 minutes and cool to room temperature
before analysis.
Reductant container: NaBH
4
0.6% w/b
NaOH 0.5% w/v
Acid container: 5 M HCl (Higher acid concentrations
will reduce the analytical signal.)

Agilent Technologies VGA 77 Specifications

General

Brand	Agilent Technologies
Model	VGA 77
Category	Laboratory Equipment
Language	English