Thermo Scientific AQUAfast AQ3700, User Manual

Page: 17 / 264

Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Notes:
1. The terms total Alkalinity, Alkalinity-m, m-Value and Alkalinity to pH 4.3 are identical.
2. For accurate results exactly 10 ml of water sample must be taken for the test.
3. Conversion table:
Acid demand to pH 4.3
DIN 38 409 (K
S4.3
)
German
°dH*
English
°eH*
French
°fH*
1 mg/l CaCO
3
0.02 0.056 0.07 0.1
*Carbonate hardness (reference = Hydrogencarbonate-anions)
Example:
10 mg/l CaCO
3
= 10 mg/l x 0.056 = 0.56 mg/l °dH
10 mg/l CaCO
3
= 10 mg/l x 0.02 = 0.2 mmol/l
4. CaCO
3
°dH
°eH
°fH
°aH