84 Instruction Manual QuickTOC
®
ultra
IECEx 12E5119
6 Reagents and Calibration Standards
6.2 Calibration Standards LAR | PROCESS ANALYSERS AG
6.2.1.2 Dilution of the Stock Solution - TOC-Difference Method
Because the analysers work in different working ranges, the following three stock solution dilutions are
listed. These dilutions enable calibration standards to be made which have a lower concentration than
listed in the table below.
Proceed as follows:
1. Take a 500 ml/2,000 ml graduated flask.
2. Fill the dilution amount specified in the table into the graduated flask.
3. Fill the graduated flask with deionised water up to the 500 ml/2,000 ml mark.
The calibration standard can be diluted further after the stock solution is diluted:
1. Take a 100 ml graduated flask.
2. Fill the dilution amount specified in the table into the graduated flask.
3. Fill the graduated flask with deionised water up to the 100 ml mark.
Table 10: Dilution of the Stock Solution (TOC-Difference Method)
Amount
Stock Solution :
Deionised Water
Stock Solution to
Deionised Water
TC
[mg/lC]
TIC
[mg/lC]
TOC
[mg/lC]
Dilution I 1 : 10 50 ml to 500 ml 400 100 300
Dilution II 1 : 40 12.5 ml to 500 ml 100 25 75
Dilution III 1 : 800 2.5 ml to 2,000 ml 5 1.25 3.75
Table 11: Dilution of the Calibration Standards (TOC-Difference Method)
TC
[mg/l C]
TIC
[mg/l C]
Dilution Amount Dilution TOC
[mg/l C]
360 90 I 90 ml 270
300 75 I 75 ml 225
280 70 I 70 ml 210
200 50 I 50 ml 150
120 30 I 30 ml 90
50 12.5 II 50 ml 37.5
40 10 II 40 ml 30
20 5 II 20 ml 15
10 2.5 II 10 ml 7.5
2 0.5 III 40 ml 1.5
1 0.25 III 20 ml 0.75
0.5 0.125 III 10 ml 0.375
0.2 0.05 III 4 ml 0.15
0.1 0.025 III 2 ml 0.075
Notice
The calibration standards can be kept in a sealed glass bottle for about one week at
a temperature of 4°C.
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