Release 08/2014 - Spectroquant
®
Multy
114758
Test
Shake the cell vigorous-
ly to dissolve the solid
substance.
Quality assurance:
To check the measurement system (test reagents, meas-
urement device, and handling) ready-for-use chromate
standard solution Certipur
®
, Cat.No. 119780, concen-
tration 1000 mg/l CrO
4
2–
, can be used after diluting
accordingly.
The measurement results are expressed in µg/l.
Add 10 ml of the sample
with pipette, close with
the screw cap, and mix.
Place 2 level grey micro-
spoons of Cr-1 into a dry
24-mm cell.
Add 12 drops of Cr-2,
close with the screw cap.
Chromate
Determination of chromium(VI)
Important:
For the determination of total chromium = sum of
chromium(VI) and chromium(III) a pretreatment
with Crack Set 10C, Cat.No. 114688, or Crack Set 10,
Cat.No. 114687 and thermoreactor is necessary.
Measuring range: 10 – 1400 µg/l Cr
24-mm cell
22 – 3123 µg/l CrO
4
24-mm cell
Attention: In contrast to the instructions given in the package insert the sample volume as well as the reagent volume
must be doubled.
Fill approx. 10 ml of
distilled water into a
24-mm cell (do not add
any reagents!), close
with the screw cap.
(Blank cell)
Select method 1 5 1 .
Insert the cell containing
the sample into the cell
compartment. Align the
mark on the cell with
that on the photometer.
Press Test .
Reaction time:
1 minute
Press Enter to start
the countdown.
Check the pH of the
sample, specified range:
pH 1 – 9.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .
