Understanding Variation in Partition Coefficient, Kd, Values Volume II

Table 5.1. Estimated mean composition of river
water of the world from Hem (1985). 1
Dissolved Constituent
5.3
Total Concentration
mg/l mol/l
Silica, as H 4SiO 4 20.8 2.16 x 10 -4
Ca 15 3.7 x 10 -4
Mg 4.1 1.7 x 10 -4
Na 6.3 2.7 x 10 -4
K 2.3 5.9 x 10 -5
Inorganic Carbon, as CO 3 57 9.5 x 10 -4
SO 4 11 1.1 x 10 -4
Cl 7.8 2.2 x 10 -4
F 1 5 x 10 -5
NO 3 1 2 x 10 -5
PO 4 0.0767 8.08 x 10 -7
1 Most values from this table were taken from Hem (1985: Table 3,
Column 3). Mean concentrations of total dissolved fluoride and
phosphate are not listed in Hem (1985, Table 3). The concentration of
dissolved fluoride was taken from Hem (1985, p. 120) who states that the
concentration of total dissolved fluoride is generally less than 1.0 mg/l for
most natural waters. Hem (1985, p. 128) lists 25 micro g/l for average
concentration of total dissolved phosphorous in river water estimated by
Meybeck (1982). This concentration of total phosphorus was converted
to total phosphate (PO 4) listed above.