Hach DR/700 - Page 20

1-2
Conversions
Conversion factors for many of the commonly used units of measure
have been included to make the use of this manual more universal and to
simplify calculations. Conversions are categorized by test.
Nitrogen
Nitrite (NO
2
) = Nitrogen (N) x 3.28
Nitrate (N0
3
) = Nitrogen (N) x 4.42
Ammonia (NH
3
) = Nitrogen (N) x 1.22
Ammonium (NH
4
) = Nitrogen (N) x 1.29
Phosphate
Phosphorus (P) = Phosphate (PO
4
) x 0.326
Phosphorus Pentoxide (P
2
O
5
) = Phosphate (PO
4
) x 0.75
Table 1. Hardness Conversion
British American French German
gr/gal gr/gal parts/ parts/
Units of mg/l (Imperial) (US) 100,000 100,000 lb./cu ft
Measure CaCO
3
CaCO
3
CaCO
3
CaCO
3
CaO meq/L* g/L CaO CaCO
3
mg/L CaCO
3
1.0 0.07 0.058 0.1 0.056 0.02 5.6X10
-4
6.23X10
-5
English gr/gal
CaCO
3
14.3 1.0 0.83 1.43 0.8 0.286 8.0X10
-3
8.91X10
-4
US gr/gal
CaCO
3
17.1 1.2 1.0 1.72 0.96 0.343 9.66X10
-3
1.07X10
-3
Fr. p/100,000
CaCO
3
10.0 0.7 0.58 1.0 0.56 0.2 5.6X10
-3
6.23X10
-4
Ger. p/100,000
CaO 17.9 1.25 1.04 1.79 1.0 0.358 1.0
X10
-2
1.12X10
-3
meq/L 50.0 3.5 2.9 5.0 2.8 1.0 2.8X10
-2
3.11X10
-3
g/l CaO 1,790.0 125.0 104.2 179.0 100.0 35.8 1.0 0.112
lb./cu ft CaCO
3
16,100.0 1,123.0 935.0 1,610.0 900.0 321.0 9.0 1.0
*or 'epm/L,' or 'mval/L'
N.B. 1 meq/L = N/1000