Sense index

Items

Index

Vc grade

Food grade

Daily chemical industry grade

Appearan ce

Colourless or yellowish,clear and transparent liquid

Chemical and Physical index

Items

    Unit

Index

Vc grade

Foodgrade

Daily chemical industry grade

Content(dry basis)

%

98.5

70

80-92

Solid substance

%

80-92

70

70

DE(dry basis)

%

0.15

0.2

0.2

PH

5.0-7.0

5.0-7.0

5.0-7.0

Hygiene index

Items

Vc grade

Foodgrade

Daily chemical industry grade

Heavy metal

5mg/kg

5mg/kg

5mg/kg

Nickle

1mg/kg

1mg/kg

1mg/kg

Pb(Pb2+)

0.5mg/kg

0.5mg/kg

0.5mg/kg

As(As3-)

0.5mg/kg

0.5mg/kg

0.5mg/kg

Sulphate ash

0.1%

0.1%

0.1%

Chlorid

10mg/kg

20mg/kg

20mg/kg

Sulphate

30mg/kg

30mg/kg

30mg/kg