wtw P 700 IQ, Preparation Instructions

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Preparation instructions for P 700 IQ-solutions
8
sure the funnel and the reactor walls are rinsed thoroughly.
(Step does not apply for ST 0.0)
•
Then add the corresponding amount of hydrochloric acid (see Table 2-1) with the
measuring cylinder.
•
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.
Prepared
amount
in L
Sample weight of
KH
2
PO
4
in g
Sample weight of
water amount
in kg
Addition to
HCl
in mL
Total sample weight of
water
in g
For ST 0.0
10 - Approx. 8 13 9972
20 - Approx. 17 27 19943
30 - Approx. 25 40 29915
40 - Approx. 30 53 39887
50 - Approx. 40 67 49858
60 - Approx. 50 80 59830
For ST 1.6
10 0.0703 Approx. 8 13 9972
20 0.1406 Approx. 17 27 19943
30 0.2109 Approx. 25 40 29915
40 0.2812 Approx. 30 53 39887
50 0.3515 Approx. 40 67 49858
60 0.4218 Approx. 50 80 59830
For ST 8.0
10 0.3515 Approx. 8 13 9972
20 0.7030 Approx. 17 27 19943
30 1.0545 Approx. 25 40 29915
40 1.4059 Approx. 30 53 39887
50 1.7574 Approx. 40 67 49858
60 2.1090 Approx. 50 80 59830
For ST 20.0
10 0.8787 Approx. 8 13 9972
20 1.7575 Approx. 17 27 19943
30 2.6361 Approx. 25 40 29915
40 3.5149 Approx. 30 53 39887
50 4.3936 Approx. 40 67 49858
60 5.2724 Approx. 50 80 59830
Table 2-1: Sample weights depending on the prepared amount (sample weight of water for
ξ = 18 °C) and standard solution
Testing
The quality of the prepared phosphate phosphor standard solutions should be checked using
a suitable measuring system
1
. The measuring system and the calibration standard must be
prepared for this as per Chapter 2.1. Calibrating with traceable standards ensures the
traceability to reference material by the NIST/PTB.
•
The standard solution is checked using a suitable measuring system
•
The presence of chloride must also be checked (qualitative testing for the use of
added hydrochloric acid).
1
Accuracy ≤ 1 % (deviation of the measuring system)