|
Total acidity
|
Min 69.5% (as HNO3)
|
|
Residue on ignition
|
Max 0.001%
|
|
Chlorides
|
Max 0.00005%(0.5 ppm) (as Cl)
|
|
Sulphates
|
Max 0.0002% (2 ppm) (as H2SO4)
|
|
Heavy metals (as Pb)
|
To pass test
|
|
Arsenic (As)
|
Max 0.000001% (0.01 ppm)
|
|
Iron (Fe)
|
Max 0.00002% (0.2 ppm)
|
|
Manganese (Mn)
|
Max 0.00004 (0.4 ppm)
|
|
Phosphate (PO4)
|
Max 0.0001% (1 ppm)
|
|
Silicate (SiO2)
|
Max 0.00005% (0.5 ppm)
|