Millipore Spectroquant Multy Operating Manual page 188

Measuring range: 0.05 – 1.50 mg/l surfactants (cationic)
(calculated as N-cetyl-N,N,N-trimethylammonium bromide)
Check the pH of the Select method 4 7 1 .
sample, specified range:
pH 3 – 8.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Swirl both cells for Reaction time:
30 seconds. 5 minutes
Press Enter to start
the countdown.
Release 08/2014 - Spectroquant
Surfactants (cationic)
Pipette 5.0 ml of the
sample into a reaction
cell, do not mix!
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .
®
Multy
16-mm cell
Pipette 5.0 ml of distilled
water into a second
reaction cell, close with
the screw cap, do not
mix!
(Blank cell)
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) a surfactants standard
solution must be prepared from N-cetyl-N,N,N-trimethyl-
ammonium bromide, Cat.No. 102342 (see section "Stan-
dard solutions").
101764
Cell Test
Add to each cell 0.50 ml
T-1K with pipette, close
with the screw cap.