Metrohm 2.946.0010, Руководство пользователя

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5 Operation
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NOTICE
All volumes have to be in mL (milliliter).
The Total cell volume is the volume of all solutions at the start of
the determination. This includes sample volume and auxiliary solu-
tions such as additional water and electrolyte, but not volumes for
standard addition. The standard addition volume will automatically
be taken into account.
4 Close the dialog window Method parameters with [OK] .
The determination will automatically be recalculated with the new
settings.
5.2 Carrying out the determination of As(total) accord-
ing to Application Bulletin 416
NOTICE
More detailed information on this application can be found in the
Application Bulletin 416 - Determination of arsenic in water
with the scTRACE Gold
, which is available for download from
https://www.metrohm.com .
On this website also other applications using the scTRACE Gold elec-
trode and the 946 Portable VA Analyzer can be found.
5.2.1 General operation
Prepare the reagents as described in Application Bulletin 416. The follow-
ing reagents are required for the determination of As(total) with the 946
Portable VA Analyzer:
Cleaning solution c(H
2
SO
4
) = 0.5 mol/L, c(KCl) = 0.05 mol/L
Electrolyte c(sulfamic acid) = 1 mol/L, c(citric acid) = 0.5
mol/L, c(KCl) = 0.45 mol/L
KMnO
4
solution c(KMnO
4
) = 0.2 mmol/L
As(V) standard
solution
β
(As V ) = 0.5 mg/L