Pollutant

Pollutant concentration, mg kg-1

Pollutant loading rate, kg ha-1

Ceiling

Monthly average

Annual

Cumulative

Arsenic

75

41

2.0

41

Cadmium

85

39

1.9

39

Copper

4300

1500

75

1500

Lead

840

300

15

300

Mercury

57

17

0.85

17

Molybdenum

75

-

-

-

Nickel

420

420

21

420

Selenium

100

100

5.0

100

Zinc

7500

300

140

2800

Table 1: Quality standards of biosolids for land application [7].