Item

Index

Type I

Type Ⅱ

Type Ⅲ

Appearance

White crystalline powder

Total alkalinity（NaHCO3）/w/% ≥

99.5

GB/T 1606-2025

98.5

loss on drying /w/% ≤

0.10

GB/T 1606-2025

0.20

pH value（10g/L aqueous solution）/ ≤

8.3

GB/T 1606-2025

8.7

Cl/w/% ≤

0.05

GB/T 1606-2025

0.60

Fe/w/% ≤

0.001

GB/T 1606-2025

0.01

water-insoluble substance/w/% ≤

0.01

GB/T 1606-2025

-

SO4 /w/% ≤

0.02

GB/T 1606-2025

0.5

Ca /w/% ≤

0.03

-

As /w/% ≤

0.0001

heavy metal /w/% ≤

0.0005