Hardness Conversion - Hach DR/850 Procedures Manual

CHEMICAL ANALYSIS INFORMATION

Hardness Conversion

Units of mg/L
Measure CaCO
3
mg/L
1.0
CaCO
3
English
gr/gal 14.3
CaCO
3
US gr/gal
17.1
CaCO
3
Fr. p/
100,000 10.0
CaCO
3
Ger. p/
100,000 17.9
CaO
meq/L 50.0
g/L CaO 1790.0
lbs./cu ft
16,100.0
CaCO
3
1
'epm/L, or 'mval/L'
Note: 1 meq/L = 1N/1000
Table 2 lists the factors for converting one unit of measure for hardness to
another unit of measure. For example, to convert mg/L CaCO
parts/100,000 CaO, multiply the value in mg/L x 0.056.
Table 2 Hardness Conversion Factors
British gr/ America
gal n gr/gal
(Imperial) (US)
CaCO CaCO
3 3
0.07 0.058
1.0 0.83
1.2 1.0
0.7 0.58
1.25 1.04
3.5 2.9
125.0 104.2
1,123.0 935.0
, continued
French German
parts/ Parts/
meq/L
100,000 100,000
CaCO CaO
3
0.1 0.056
1.43 0.83
1.72 0.96
1.0 0.56
1.79 1.0
5.0 2.8
179.0 100.0
1,610.0 900.0
15
to German
3
lbs./cu ft
1
g/L CaO
CaCO
-4
0.02 5.6x10 6.23x10
-3
0.286 8.0x10 8.9x10
-3
0.343 9.66x10 1.07x10
-3
0.2 5.6x10 6.23x10
-2
0.358 1x10 1.12x10
-2
1.0 2.8x10 3.11x10
35.8 1.0
321.0 9.0
3
-5
-4
-3
-4
-3
-2
0.112
1.0