Parameter

Standard

Test

 Content，%

≥99.0

99.2

 Melting point，℃

185.0-190.0

185.4-186.7

 Chloride(as Cl)，%

≤0.005

<0.005

 Iron(as Fe) ，%

≤0.001

<0.001

 Heavy metal (as Pb) ，mg/kg

≤5

<5

 Sulfate(as SO42-)，%

≤0.02

<0.02

Readily oxidizable substances，mL/g

≤1.0

<1

Arsenic(as As2O3)，mg/kg

≤3

<3

Residice after burning，%

≤0.025

<0.025

Matters insolubles in water，%

≤0.005

<0.025