Item

unit

BP93

BP98

USP24

Standard of the Enterprise

Characters

 

Colourless Crystal or White Crystal Powder

Identification

 

Conforming with the test

Clarity and Colourness

 

20%Aqueous Solution Clearness

 

 

50%Aqueous Solution Clearness

Content

%

99.5-101.5

 

99.5-100.5

99.65-100.50

water

%

7.5-9.0

7.5-9.0

≤8.8

7.5-8.8

Ba

 

Conforming with the test

 

 

Conforming with the test

Ca

ppm

≤200

 

 

≤100

Fe

ppm

≤50

 

 

≤5

As

ppm

≤1

 

≤3

≤0.5

Heavy metals

ppm

≤10

≤10

≤10

≤1

Oxalic acid salt

ppm

≤350

≤350

Conforming with the test

≤20

Chloride

ppm

≤50

 

 

≤5

Sulphate

ppm

≤150

≤150

Conforming with the test

≤50

RCS B.U.

 

Not beyond standard

Not beyond standard

Not beyond standard

Shllow in the standard

Sulphuric acid ash content

 

≤0.1

≤0.1

≤0.05

≤0.03

Organic volatile impurities

 

 

 

Conforming with the test

Conforming with the test

Lead

ppm

 

d"0.2

 

 

Al

ppm