Electro-Chemical Devices (ECD) CA6 Hardness Analyzer - Manual (Page 80)

11.4 Reagents
!
For reagent preparation use demineralised water and analytical quality reagents.
DANGER:
Read the precaution and (MSDS) datasheets and wear protective gloves, clothes and glasses
before use of chemical products.
11.4.1 REAGENT 1
CA6 Hardness reagents
Reagent 1
Cresolphthalein Solution
Part Number# 2010037-1
For 1 Liter preparation:
Name
Quantity
Hydrochloric Acid 37%, ACS Reagent
CAS Number: 7647-01-0
2.83 ml/L
o-Cresolphthalein Complexone
CAS Number: 2411-89-4
0.075 g/l
Clean all equipment with DI water before use.
Dissolve o-cresolphthalein in 2.83 ml of the concentrated hydrochloric acid. It may take a minute or so.
Fill a 1 liter volumetric flask to 2/3rds capacity with DI water. When dissolved slowly add the
Cresolphthalein HCl solution to the water while stirring the solution. Fill the volumetric flask to the
gauge line (1 liter). Transfer to the reagent 1 container provided with the analyzer.
11.4.2 REAGENT 2
Reagent 2
Ethanolamine solution
Part Number# 2010038-1
For 1 Liter preparation:
Name Quantity
Ethanolamine, ACS Reagent
CAS Number: 141-43-5
200 ml/L
Deionized Water 800 ml
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