SODIUM META BISULPHITE                                          

REF.NO:60-10-081-00

A

FORMULA : Na2S2O5

F. Wt:190.10

B

                                    SPECIFICATIONS

1

Appearance

White powder

2

Clarity of 20% aqueous solution

Clear and colorless

3

pH of 5% solution at 20oC

3.8 -4.4

4

Assay

Min :95.0%

5

Thiosulphate

Max: 0.04 wt %

6

Heavy metals as Pb

Max:50 ppm

7

Iron

Max :50 ppm

8

Insoluble matter

Max : 0.05%

9

Reaction with ammonical silver nitrate

To pass

10

Practical test

Passes the test

C

Quantity of sample required for test

500gms

D

Mode of packing

To be packed in PE container with PE  screw cap and PE insert