Preparation instructions for P 700 IQ-solutions
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Preparation instruction for cleaning solution CL 1.0
This is the preparation instruction for the CL 1.0 cleaning solution as required for operating
the P 700 IQ orthophosphate analyzer.
Chemicals and materials required:
•
Sodium hydroxide NaOH (4 %)
•
Na
2
EDTA (Titriplex III) (39 g/l)
•
Demineralized water (residual conductivity
25 °C
κ <2µS/cm)
Containers, labels:
•
B lids 1.0 L as per Chapter 5.1
•
Label with color marking as per Chapter 5.2
Instruments
•
Precision balance (± 0.1 g) with summing function
•
Reactor with agitator
•
Measuring beaker 5 L
•
Funnel
•
2 beakers
•
Conductivity measuring instrument with conductivity sensor (e.g. Multi 3430 with TetraCon
925 from WTW GmbH); (permissible error of the measuring system for conductivity
measurement
≤ 2 % in the measuring range mentioned below)
Preparations
•
Check reactors, agitators, vessels and other aids and appliances mentioned above for
cleanliness, clean if necessary.
•
The measuring beaker is filled with demineralized water from the conduit system and then
emptied again. The precision balance is tared with the still wet measuring beaker.
•
Insert the funnel in the filler neck.
Preparation
•
Fill the measuring beaker with demineralized water and place on the precision balance.
The mass of the water poured in is saved by pressing the sum button.
•
Pour the contents of the measuring beaker through the funnel into the reactor. Repeat this
process until the approximate amount of water (see Table 4-1) is in the reactor.
•
Then, depending on the batch size (see Table 4-1), weigh the corresponding amounts of
NaOH and Titriplex III into the beakers with the precision balance and transfer the
necessary quantity into the reactor. Make sure the funnel and the reactor walls are rinsed
thoroughly.
•
Lastly, fill the reactor with the remaining demineralized water until the specified mass of
water is reached.
•
Then switch on the agitator for at least 5 minutes.