Phenylmercuric Nitrate

Phenylmercuric Nitrate USP NF Grade Specifications
Mercury, (nitrato-O)phenyl-.
Nitratophenylmercury --- CAS 55-68-5

Phenylmercuric Nitrate is a mixture of phenylmercuric nitrate and phenylmercuric hydroxide containing not less than 87.0 percent and not more than 87.9 percent of phenylmercuric ion (C6H5Hg+), and not less than 62.75 percent and not more than 63.50 percent of mercury (Hg).

Identification:
A: Add 3 mL of sulfuric acid to 0.1 g of it: the mixture becomes yellow, and the characteristic odor of nitrobenzene is evolved.
B: To 5 mL of a saturated solution of it add 1 mL of 3 N hydrochloric acid: a white precipitate is formed.
C: To 5 mL of a saturated solution of it add 5 mL of ammonium sulfide: there is no reaction in the cold, but upon heating in a boiling water bath for 10 minutes a black precipitate is formed.
Residue on ignition: not more than 0.1%.
Mercury ions: To 5 mL of a saturated solution add 5 mL of 1 N sodium hydroxide: no yellow precipitate is formed (mercuric ions) and the solution does not darken (mercurous ions).
Assay for phenylmercuric ions: Transfer about 200 mg, accurately weighed, to a conical flask, and dissolve in 90 mL of water and 10 mL of nitric acid. Add 2 mL of ferric ammonium sulfate, and titrate with 0.05 N ammonium thiocyanate. Each mL of 0.05 N ammonium thiocyanate is equivalent to 13.88 mg of phenylmercuric ion (C6H5Hg+).
Assay for mercury: Transfer about 400 mg of Phenylmercuric Nitrate, accurately weighed, to a 100-mL flask, add 15 mL of water, 5 mL of formic acid, and 1 g of zinc dust, and reflux for 30 minutes. Cool, filter, and wash the filter paper and the amalgam with water until the washings are no longer acid to litmus. Dissolve the amalgam in 40 mL of 8 N nitric acid. Heat on a steam bath for 3 minutes, then add 0.5 g of urea and enough potassium permanganate to produce a permanent pink color. Cool, decolorize the solution with hydrogen peroxide, add 1 mL of ferric ammonium sulfate, and titrate with 0.1 N ammonium thiocyanate. Each mL of 0.1 N ammonium thiocyanate is equivalent to 10.03 mg of Hg.

Phenylmercuric Nitrate BP Ph Eur Grade Specificatiosn
Ph Eur --- CAS 55-68-5

Action and use: Antiseptic; antimicrobial preservative.

DEFINITION
Mixture of phenylmercuric nitrate (C6H5HgNO3; Mr 339.7) and phenylmercuric hydroxide (C6H5HgOH; Mr 294.7).
Content: 62.5 per cent to 64.0 per cent of Hg (Ar 200.6) (dried substance).

CHARACTERS
Appearance: White or pale yellow powder.
Solubility: Very slightly soluble in water and in ethanol (96 per cent), slightly soluble in hot water. It dissolves in glycerol and in fatty oils.

IDENTIFICATION
A. To 5 ml of solution S add 8 ml of water and 0.1 ml of sodium sulphide solution. A white precipitate is formed that darkens slowly on heating.
B. To 1 ml of a saturated solution of the substance to be examined add 1 ml of dilute hydrochloric acid. A white, flocculent precipitate is formed.
C. To 5 ml of solution S add 1 ml of dilute hydrochloric acid, 2 ml of methylene chloride and 0.2 ml of dithizone solution. Shake. The lower layer is orange-yellow.
D. About 10 mg gives the reaction of nitrates.

TESTS
Solution S: To 0.1 g add 45 ml of water and heat to boiling with shaking. Cool, filter and dilute to 50 ml with water.
Appearance of solution: Solution S is colourless.
Inorganic mercuric compounds: Maximum 0.1 per cent.
Loss on drying: Maximum 1.0 per cent, determined on 1.000 g by drying in vacuo for 24 h.

ASSAY
Dissolve 0.150 g in a mixture of 10 ml of dilute nitric acid and 90 ml of water, heating to boiling. Cool to 15-20C. Titrate with 0.1 M ammonium thiocyanate using 2 ml of ferric ammonium sulphate solution as indicator, until a persistent reddish-yellow colour is obtained. Carry out a blank titration.
1 ml of 0.1 M ammonium thiocyanate is equivalent to 20.06 mg of Hg.

STORAGE
Protected from light.

Certifications :
We manufacture Bulk Drugs / API, Excipients, Pharmaceuticals (IP/BP/USP/NF/Ph. Eur, JP/ CP), Speciality Chemicals(Pure/AR/ACS), Mineral Fortifiers, Food Chemical Codex (FCC) and Flavour chemicals. Our manufacturing facility is cGMP, GLP, ISO 9001, ISO 14001, ISO 22000, ISO/IEC 17025, FSSC 22000, FSSAI, Kosher, HALAL, EXCiPACT, WC, COPP, WHO-GMP and WC certified. We are also REACH registered for export to European countries.