Millipore Spectroquant Multy Operating Manual page 95

Measuring range: 10 – 1400 µg/l Cr
22 – 3123 µg/l CrO
Attention: In contrast to the instructions given in the package insert the sample volume as well as the reagent volume
must be doubled.
Check the pH of the Select method 1 5 1 .
sample, specified range:
pH 1 – 9.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Shake the cell vigorous- Add 10 ml of the sample
ly to dissolve the solid with pipette, close with
substance. the screw cap, and mix.
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.
Release 08/2014 - Spectroquant
Chromate
Determination of chromium(VI)
24-mm cell
24-mm cell
4
Fill approx. 10 ml of
distilled water into a
24-mm cell (do not add
any reagents!), close
with the screw cap.
(Blank cell)
Reaction time:
1 minute
Press Enter to start
the countdown.
®
Multy
Place 2 level grey micro-
spoons of Cr-1 into a dry
24-mm cell.
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .
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-
2–
tration 1000 mg/l CrO , can be used after diluting
4
accordingly.
The measurement results are expressed in µg/l.
114758
Test
Add 12 drops of Cr-2,
close with the screw cap.
Insert the cell containing
the sample into the cell
compartment. Align the
mark on the cell with
that on the photometer.
Press Test .