Hach 1950Plus, Инструкция по эксплуатации инструмента, Страница: 49 / 188

Page 49
UVTOCReagents and Standards.fm
Preparing Reagents and Calibration Standards
Section 3 Preparing Reagents and
Calibration Standards
3.1 Types of Fluids
The analyzer uses five types of fluids (see Appendix D Reagents and
Calibration Standards on page 166 for ordering information in the U.S.):
See Appendix C on page 161 for a
list of abbreviations, acronyms and
definitions used in this manual.
• Calibration standards (zero and span)
• Phosphoric acid
• Sodium persulfate
• Cleaning solution
Consistent preparation and handling of these solutions according to the
guidelines in this section will enhance the accuracy and repeatability of the
analyzer. All chemicals should be of ACS grade or better.
3.2 Recommended Tools and Materials
• Volumetric glassware made of borosilicate glass (such as Pyrex
®
)
• Stoppers, caps, or plugs which fit the glassware and resist attack from
reagent solutions
• Cleaning solution for glassware of 0.5 molar H
3
PO
4
• Proper lab setup for handling chemicals
• Lab coat, safety gloves, and goggles
3.3 Obtaining DI Water
You must use reagent-grade DI water with less than 50 µg/L TOC for
calibration and reagent preparation. This equates to Type I water as defined
by the National Committee for Clinical Laboratory Standards. For more
details, refer to Standard Methods for the Examination of Water and
Wastewater, 20th edition, 1998, Part 1080, p 1–36, Reagent Grade Water.