Test item

Unit

Specification

Test datum

K₂S₂O₅

g/100g

≥97.2

97.3

SO₂

g/100g

≥56.0

56.14

K₂S₂O₃

g/100g

≦ 0.1

0.002

Na

g/100g

≦ 2

0.090

Cl

g/kg

≦ 0.5

0.01

pH-value(10%solution)

–

3.8-4.8

4.4

heavy metal（measured by Pb）

mg/kg

≦10

8

As

mg/kg

≦ 1

0.05

Cu

mg/kg

≦1

0.3

Fe

mg/kg

≦5

3.6

Hg

mg/kg

≦0.1

0.02

Pb

mg/kg

≦1

0.5

Se

mg/kg

≦1

0.1

Zn

mg/kg

≦ 1

0.3