Item

Top grade

First grade

Qualified product

Mass fraction of total acidity (calculated by HCL)/% ≥

31.0

Mass fraction of iron (calculated as Fe)/% ≤

0.002

0.008

0.01

Mass fraction of burning residue meter/% ≤

0.05

0.10

0.15

Mass fraction of free chlorine (calculated as Cl)/% ≤

0.004

0.008

0.01

Mass fraction of arsenic/% ≤

0.0001

The mass fraction of sulfate ( calculated as SO4 2- )//% ≤

0.005

0.03

-

Note: Arsenic Index is mandatory

No.

Item

Index

1

Total acidity (calculated as HCl), ω/% ≥

31.0

2

Calcium (calculated as Ca) mg/L ≤

0.50

3

Magnesium (calculated as Mg) mg/L ≤

0.10

4

Iron (calculated as Fe) mg/L ≤

2.0

5

Manganese (calculated as Mn) mg/L ≤

1.0

6

Residue on Evaporation mg/L ≤

30.0

7

Free chlorine (calculated as Cl) mg/L ≤

40.0