Item

Specification BP & EP

Assay (by BP/EP Method)

99.0 to 100.5% of C₇H₅NaO₂

Alkalinity

Not more than 0.2 ml of 0.1 N HCl per 20 ml of a 5 % (w/v) solution. (0.08 % as NaOH)

Acidity

Not more than 0.2 ml of 0.1 N NaOH per 20 ml of a 5 % (w/v) solution. (0.244 % as Benzoic)

Clarity of solution

10 % (w/v) solution is clear

Color of solution

Not more intensely coloured than reference solution

Heavy metals (as Pb)

10 ppm max

Total Chlorine

300 ppm max

Arsenic:

3 ppm max

Lead:

5 ppm max

Mercury:

1 ppm max

Loss on drying

When dried to a constant weight @ 100 to 105° C, not more than 2.0 % of its weight is lost.