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Paragraph 3 Reagents

Original text. Later amendments are not shown.

The following reagents shall be used–

(a)

concentrated sulphuric acid solution;

(b)

silicone-based anti-foaming emulsion;

(c)

cyclohexane (analytical reagent grade);

(d)

hexane (analytical reagent grade);

(e)

ethanol (analytical reagent grade);

(f)

anhydrous sodium sulphate;

(g)

silica gel GF 254 (Merck or equivalent);

(h)

standard 1 per centum (weight/volume) solution of pure biphenyl in cyclohexane: dilute with cyclohexane to obtain the following three solutions–

(i)

0.6 μg/μl;

(ii)

1 μg/μl;

(iii)

1.4 μg/μl.