SCHEDULED MAINTENANCE
Speciation of Chromium(vi) and Chromium(iii) Using Pneumatically Assisted Electrospray Mass Spectrometry
Abstract
Mass spectra can be obtained from aqueous solutions containing both
Cr
3+
and Cr
2
O
7
2-
as
negative ions under the same spray conditions. An excess of HCl is used so
that Cr
3+
sprays as an anionic chloro complex. Moderately
energetic collision conditions produce CrO
3
-
from Cr
VI
and CrOCl
2
-
from
Cr
III
. Detection limits are 100 and 60 ppb for Cr
III
and Cr
VI
, respectively. Reasonable calibration curves are
provided by plotting the ratio of the analyte signal to that for
37
Cl
-
.
Please wait while we load your content...
