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KOH

≥ 95

≥90

K2CO3

≤0.5

≤0.5

Chloride(Cl)

≤0.005

≤0.005

Fe

≤0.0005

≤0.0005

Sulfate(SO4)

≤0.005

≤0.005

Nitrate(N)

≤0.0005

≤0.0005

Na

≤0.5

≤0.25

Phosphate(PO4)

≤0.005

≤0.005

Silicate(SiO3)

≤0.01

≤0.01

Al

≤0.002

≤0.002

Ca

≤0.005

≤0.005

Ni

≤0.0005

≤0.0005

Heavy metal(as Pb)

≤0.002

≤0.002