Millipore Spectroquant Multy Operating Manual page 93

Measuring range: 0.05 – 2.00 mg/l Cr
0.11– 4.46 mg/l CrO
Check the pH of the Select method 1 5 0 .
sample, specified range:
pH 1 – 9.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Add 5.0 ml of the sample Reaction time:
with pipette, close with 1 minute
the screw cap, and mix. Press Enter to start
the countdown.
Release 08/2014 - Spectroquant
Chromate
Determination of chromium(VI)
16-mm cell
16-mm cell
4
Fill approx. 10 ml of
distilled water into an
empty 16-mm cell (do
not add any reagents!),
close with the screw
cap.
(Blank cell)
Insert the blank cell into
the cell compartment.
Press Zero .
®
Multy
Add 6 drops of Cr-3K
into a reaction cell, 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 .
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.
114552
Cell Test
Shake the cell vigor-
ously to dissolve the
solid substance and
leave to stand for
1 minute.