ANALYTICAL ITEMS

SPECIFICATION

               RESULTS

Character

Red brown viscous liquid; Highly acidic.

Conforms

Relative density

1.10～1.30

1.20

Identification

Positive reaction

Positive reaction

Maximum absorption at 281 nm

Conforms

 Related substances

Containing m-cresol -4, 6-disulfonic acid not more than

1.5%

0.4%

Containing m-cresol 4-sulfonic acid not more than

17.0%;

7.7%

Containing m-cresol 6-sulfonic acid not more than 7.0%;

2.1%

                 Bisphenol sulfonic acid should be no less than 1.9%

3.3%

The peak area of m-cresol -4, 6-disulfonic acid, m-cresol -4-

sulfonic acid and m-cresol -6- sulfonic acid was removed.

The peak area normalization method was used to calculate

the sum of polysulfonic acid and bisphenol sulfonic acid

area not less than 40%.

51%

Sulfates

NMT 2.0%

Conforms

Barium salt

Conforms

Conforms

 Residue on ignition

NMT 0.2%

0.02%

Heavy metals

NMT 20 ppm

Conforms

Trichloromethane

NMT 0.0006%

N.D

Contents

45.0%～55.0%（g/g)

50.1%

pH

NMT 1

NMT 1