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Macro 900 Operation Manual
V3
© 2013 Palintest Ltd.
www.palintest.com
Page 67 of 147
Calibration of the BGA-PE probe Zero point is normally carried out during
MacroCal (see
Full two-point calibration should be carried out every few months.
15.3.4.
Calibration Solution Preparation
In order to 'calibrate' (actually, set the relative sensitivity) of the BGA-PE
probe, an 8µg/L calibration solution of fluorescent dye known as Rhodamine WT
should be used.
Please note: there is no direct correlation between Rhodamine concentration
and the number of BGA-PE cells/L. Rhodamine is used as a convenient dye for
setting the sensitivity of the sensor. The subsequent display of BGA-PE in terms
of cells/L is a generalisation based on research and experience. The only way to
obtain a true value in terms of cells/L is to correlate the values from the Probe
to quantitative data that has been obtained by laboratory analysis of grab
samples. See previous 'Limitations of Use' section.
The 8µg/L calibration solution should be freshly prepared by serial dilution from
200g/L standard using deionised water. The following Rhodamine WT standard
is recommended:
Part number: 70301027
Description: Rhodamine WT Liquid
Supplier: Keystone Europe Ltd.
Be sure to handle chemicals with care and to read and comply with all
health and safety advice.
15.3.5.
Serial Dilution
The recommended Rhodamine solution is supplied as a 20% or 200g/L solution,
dilution of the stock solution should be carried out as follows.
200g/L stock
→
8μg/L is r
ecommended to be done as a two-step dilution
procedure.
Step 1:
weigh out 0.5g of 200g/L stock solution in a weigh boat and add this to
1L of deionized water in a volumetric flask, use some of the water from the 1L
flask to rinse the weigh boat so no stock Rhodamine remains on the boat. Put
a lid on the 1L flask and invert 10 times.
This step results in a 1 in 2000 dilution of the stock, at this point the 1L flask
will contain a 100mg/L solution.
Step 2:
Transfer 80μl of the 100mg/L solution to a 1L volume
tric flask and top
up to 1L with deionized water. Put a lid on the 1L flask and invert 10 times.
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