Page 142 - Enzymes in Tropical Soils

130 Enzymes In Tropical Soils

Cadmium is a normal contaminant in phosphate fertilizers, therefore, long-
term and continuous application of phosphate fertilizers may result in a greater
amount of Cd than those found naturally (Herrero and Martin, 1993). Nicholson et
al. (1994) also reported that the Cd concentration in herbage were considerably
greater in the phosphate treated plots.

Table 9.4. The contents of Cu and Pb in several industrial
wastes from Jakarta*.

No. Waste Cu Pb
-1
....... mg kg .......
1 Metal Spoon 23.4 2.44
2 Jeans Laudry 25.6 0.44
3 Laundry 0.93 0.88
4 Electronics 4.63 130.84
5 Metal Pipe 4,01 2.72
6 Food 1.11 0.36
7 Printing 0.79 0.88
8 Candy 0.77 2.72
9 Textile A 1.25 0.20
10 Textile B 2.58 3.40
11 Textile C 3.41 2.76
12 Textile D 0.68 1.92
*Salam et al. (1996)

Table 9.5. The DTPA extracted heavy metals from dolomite and
phosphatic fertilizers.

Natural
Metal Dolomite TSP SP-36 Phosphatic
Elements Rock
-1
mg kg
Fe 2.40 383 272 1.40
Mn 1.16 15.1 7.12 0.16
Zn 0.64 152 153 9.75
Cu 0.04 16.6 17.8 0.38
Cd 0.04 3.56 1.72 1.38
After Salam (1997a)

Abdul Kadir Salam - 2014