Sievers TOC 800 - Appendix E - Calibration Standard Preparation; Equipment and Supplies for Standards; Preparing TC Calibration Standard

Ionics Instruments 2004 Page E - 1 DLM 30007-08 Rev. A
APPENDIX E – CALIBRATION STANDARD PREPARATION
To prepare calibration standards on-site, the following equipment and supplies
will be needed. Review the list and make sure all items are available.
• Anhydrous potassium hydrogen phthalate - KHP (KHC
8
H
4
O
4
,
A.C.S. Certified or Primary Standard Grade)
• Anhydrous sodium carbonate (Na
2
CO
3
, A.C.S. Certified or
Primary Standard Grade)
• Low-TOC deionized water (less than 100 ppb TOC)*
• Analytical balance capable of weighing to ± 0.001 grams (± 1 mg)
• Two 100-mL volumetric flasks
• Two 1-L volumetric flasks
• A 25-mL volumetric pipet
• A 50-mL volumetric pipet
• A drying oven
• A desiccator for storing anhydrous reagents
* If a laboratory source of low TOC water is not available, most
commercial “HLPC Grade” water has TOC < 100 ppb.
NOTE
The KHP and Na
2
CO
3
need to be dried for 2-3 hours at 110 °C (230°F) before
preparing the standard solutions.
NOTE
For instrument firmware with the DataGuard feature, enter a QA-level (or
higher) password when prompted. Check with your system administrator for an
appropriate password. See the DataGuard Operation chapter for more
information regarding the DataGuard feature.
Preparing the TC Calibration Standard
Part 1 – Measure TC of Water Used for Preparing Standards
The TC of the standards will depend on the background TC of the water
prepared for the standards; background must be accounted for for accurate
calibration.