86 Instruction Manual QuickTOC
®
ultra
IECEx 12E5119
6 Reagents and Calibration Standards
6.2 Calibration Standards LAR | PROCESS ANALYSERS AG
6.2.2.2 Dilution of the Stock Solution - TOC-Direct Method / TConly Method
Because the analysers work in different working ranges, the following four 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/1,000 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/1,000 ml mark.
The calibration standard can be diluted further after the stock solution is diluted:
1. Take a 100 ml graduated flask.
1. Fill the dilution amount specified in the table into the graduated flask.
1. Fill the graduated flask with deionised water up to the 100 ml mark.
Table 12: Dilution of the Stock Solution (TOC-Direct Method and TConly Method)
Amount
Stock Solution :
Dionised Water
Stock Solution to
Deionised Water
TOC [mg/lC]
Amount
Dilution I 1 : 2 250ml to 500ml 500
Dilution II 1 : 10 50ml to 500ml 100
Dilution III 1 : 20 25ml to 500ml 50
Dilution IV 1 : 1,000 1ml to 1,000ml 1
Table 13: Dilution of the Calibration Standards (TOC-Direct Method and TConly Method)
TOC [mg/l C] Dilution Amount Dilution
375 I 75 ml
250 I 50 ml
125 I 25 ml
50 II 50 ml
40 II 40 ml
20 II 20 ml
10 II 10 ml
5 II 5 ml
25 III 50 ml
5 III 10 ml
2.5 III 5 ml
0.5 III 1 ml
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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