Site icon Pharma Dekho

General Test Procedure Limit Test Heavy Metals

 

General Test Procedure Limit Test Heavy Metals

  1. Purpose
    1. This procedure is applicable to perform limit test for heavy metals. (Perform the test by any one method as specified in the individual monograph)
  2. Apparatus
    1. None
  3. Method A
    1. Reagents
      1. Lead standard solution (20 ppm Pb)

      2. Dilute acetic acid

      3. Dilute ammonia solution

      4. Hydrogen Sulphide solution

    2. Preparation of Reagents
    3. Lead standard solution (0.1% Pb): Dissolve 0.400 g of lead nitrate in water containing 2 ml of nitric acid and add sufficient purified water to produce 250 ml.
    4. Lead standard solution (100 ppm Pb): Dilute 1 ml of lead standard solution (0.1% Pb) to 10 ml with purified water.
    5. Lead standard solution (20 ppm Pb): Dilute 1 ml of lead standard solution (100 ppm Pb) to 5 ml with purified water.
    6. Dilute acetic acid:Dilute 5.7 ml of glacial acetic acid to 100 ml with purified water.
    7. Dilute ammonia solution: Dilute 42.5 ml of strong ammonia solution to 100 ml with purified water.
    8. Hydrogen sulphide solution: A freshly prepared saturated solution of hydrogen sulphide in purified water.Prepare the gas by the action of hydrochloric acid, diluted with equal volumes of purified water, on iron sulphide and collected in water.
  4. Procedure
    1. Standard solution: Into a 50-ml Nessler cylinder pipette 1 ml of lead standard solution (20 ppm Pb) and dilute with purified water to 25 ml. Adjust with dilute acetic acid or dilute ammonia solution to a pH between 3.0 and 4.0, dilute with purified water to about 35 ml and mix.
    2. Test solution: Into a 50-ml Nessler cylinder place 25 ml of the solution prepared for the test as directed in the STP or dissolve the specified quantity of the substance being examined in sufficient purified water to produce 25 ml. Adjust with dilute acetic acid or dilute ammonia solution to a pH between 3.0 and 4.0, dilute with purified water to about 35 ml and mix.
    3. Procedure: To each of the cylinders containing the standard solution and test solution respectively add 10 ml of freshly prepared hydrogen sulphide solution, mix, dilute to 50 ml with purified water, allow to stand for 5 minutes and view downwards over a white surface.
  5. Method B
    1. Reagents
      1. Lead standard solution (20 ppm Pb)
      2. Dilute acetic acid
      3. Dilute ammonia solution
      4. Sulphuric acid AR grade
      5. Nitric acid AR grade
      6. Hydrochloric acid AR grade
      7. Hydrogen sulphide solution
    2. Preparation of reagents
      1. Lead standard solution (0.1% Pb):Dissolve 0.400 g of lead nitrate in water containing 2 ml of nitric acid and add sufficient purified water to produce 250 ml
      2. Lead standard solution (100 ppm Pb): Dilute 1 ml of lead standard solution (0.1% Pb) to 10 ml with purified water.
      3. Lead standard solution (20 ppm Pb): Dilute 2 ml of lead standard solution (100 ppm Pb) to 10 ml with purified water.
      4. Dilute acetic acid: Dilute 5.7 ml of glacial acetic acid to 100 ml with purified water.
      5. Dilute ammonia solution: Dilute 42.5 ml of strong ammonia solution to 100 ml with purified water.
      6. Hydrogen sulphide solution: A freshly prepared saturated solution of hydrogen sulphide in purified water. Prepare the gas by the action of hydrochloric acid, diluted with an equal volumes of water, on iron sulphide and collected in purified water.

 

  1. Procedure
    1. Standard solution: Into a 50ml Nessler cylinder pipette 1ml of lead standard solution (20 ppm Pb) and dilute with purified water to 25 ml. Adjust with dilute acetic acid or dilute ammonia solution to a pH between 3.0 and 4.0, dilute with purified water to about 35 ml and mix.
    2. Test solution: Weigh in a suitable crucible the quantity of the substance specified in the STP, add sufficient sulphuric acid to wet the sample, ignite carefully at a low temperature until thoroughly charred. Add to the charred mass 2 ml of nitric acid and 5 drops of sulphuric acid and heat cautiously until white fumes are no longer evolved. Ignite, preferably in a muffle furnace, at 500oC to 600oC, until the carbon is completely burnt off. Cool, add 4 ml of hydrochloric acid, cover, digest on a water-bath for 15 minutes, uncover and slowly evaporate to dryness on a water-bath. Moisten the residue with 1 drop of hydrochloric acid, add 10 ml of hot water and digest for 2 minutes. Add ammonia solution drop wise until the solution is just alkaline to litmus paper, dilute to 25 ml with purified water and adjust with dilute acetic acid to a pH between 3.0 and 4.0. Filter, if necessary, rinse the crucible and the filter with 10 ml of purified water, combine the filtrate and washings in a 50ml Nessler cylinder, dilute with purified water to about 35 ml and mix.
    3. Procedure: To each of the cylinders containing the standard solution and test solution respectively add 10 ml of freshly prepared hydrogen sulphide solution, mix, dilute to 50 ml with purified water, allow to stand for 5 minutes and view downwards over a white surface.
  2. Method C
    1. Reagents
      1. Lead standard solution (20 ppm Pb)
      2. Dilute sodium hydroxide solution
      3. Sodium sulphide solution
    2. Preparation of reagents
      1. Lead standard solution (0.1% Pb): Dissolve 0.400 g of lead nitrate in purified water containing 2 ml of nitric acid and add sufficient purified water to produce 250ml.
      2. Lead standard solution (100 ppm Pb): Dilute 1 ml of lead standard solution (0.1% Pb) to 10 ml with purified water.
      3. Lead standard solution (20 ppm Pb): Dilute 2 ml of lead standard solution (100 ppm Pb) to 10 ml with purified water.
      4. Dilute sodium hydroxide solution: Dissolve 5.0 g of sodium hydroxide in 100 ml of purified water.
      5. Sodium sulphide solution: Dissolve 10.0 g of sodium sulphide in 100 ml of purified water.
  3. Procedure
    1. Standard solution: Into a 50ml Nessler cylinder pipette 1ml of lead standard solution (20 ppm

                    Pb), add 5 ml of dilute sodium hydroxide solution, dilute with purified water to 50 ml and mix.

    1. Test solution: Into a 50ml Nessler cylinder place 25 ml of the solution prepared for the test as

                           directed in the STP, or dissolves the specified quantity of the substance being examined in a mixture

                            of 20 ml of purified water and 5 ml of dilute sodium hydroxide solution. Dilute with purified water to

                            50 ml and mix.

    1. Procedure:To each of the cylinders containing the standard solution and the test solution respectively

                         add 5 drops of sodium sulphide solution, mix, allow standing for 5 minutes and viewing downwards

                     over a white surface.

  1. Method D
    1. Reagents
      1. Lead standard solution (1 ppm Pb)
      2. Lead standard solution (2ppm Pb)
      3. Acetate buffer pH 3.5
      4. Thioacetamide reagent
    2. Preparation of reagents
      1. Lead standard solution (0.1% Pb):Dissolve 0.400 g of lead nitrate in purified water containing 2 ml of nitric acid and add sufficient purified water to produce 250 ml.
      2. Lead standard solution (100 ppm Pb):Dilute 1 ml of lead standard solution (0.1% Pb) to 10 ml with purified water.
      3. Lead standard solution (10 ppm Pb):Dilute 1 ml of lead standard solution (100 ppm Pb) to 10 ml with purified water.
      4. Lead standard solution (2ppm Pb):Dilute 2 ml of lead standard solution (10 ppm Pb) to 10 ml with purified water.
      5. Lead standard solution (1 ppm Pb): Dilute 1 ml of lead standard solution (10 ppm Pb) to 10 ml with purified water.
      6. Acetate buffer pH 3.5:Dissolve 25 g of ammonium acetate in 25 ml of purified water and add 38 ml of 7M hydrochloric acid. Adjust the pH to 3.5 with either 2M hydrochloric acid or 6M ammonia and dilute with purified water to 100 ml.
      7. 7M hydrochloric acid: Dilute 59.5 ml of concentrated hydrochloric acid to 100 ml with purified water.
      8. 6M ammonia solution: Dilute 45 ml of strong ammonia solution to 100 ml with purified water.
      9. Thioacetamide reagent: Add 1 ml of a mixture of 15 ml of 1M sodium hydroxide, 5ml of purified water and 20 ml of glycerin (85%) to 0.2 ml of thioacetamide solution. Heat in a water bath for 20 seconds, cool and use immediately.
      10. 1M-sodium hydroxide: Dissolve 4.2 g of sodium hydroxide in 100 ml of purified water.
      11. Thioacetamide solution: Dissolve 2.0 g of thioacetamide in 50 ml of purified water.
  2. Procedure
    1. Standard solution: Into a small Nessler cylinder pipette 10ml of either lead standard solution (1

                                 ppm Pb) or lead standard solution (2ppm Pb). Add 2ml of the test solution and mix.

    1. Test solution: Prepare test solution as directed in the STP and pipette 12 ml into a small Nessler

                                    Cylinder.

    1. Procedure: To each of the cylinders add 2 ml of acetate buffer pH 3.5, mix, add 1.2ml of

                               Thioacetamide reagent, allow standing for 2 minutes and viewing downwards over a white surface.

  1. Reference
    1. None
  2. Revision History

Revision No.

Details of Changes

Reason for change

00

New GTP

NA

End of Document

Standard testing procedure of Iron Sucrose Injection

Standard testing procedure lactose

Standard testing procedure mefenamic acid

standard testing procedure domperidone

standard testing procedure flavour mixed fruit

standard testing procedure dicyclomine hydrochloride

Standard testing procedure honey pure

standard testing procedure dextromethorphan hydrobromide

standard procedure of levocarnitine injection

Analysis of Ivermectin Suspension

standard testing procedure artemether injection

standard testing procedure artemether injection

standard testing procedure Carbocisteine syrup

standard testing procedure Phytomenadione injection

standard testing procedure serratiopeptidase



standard testing procedure starch IP

standard testing procedure sucrose refined sugar

standard testing procedure titanium dioxide

standard testing procedure tramadol hydrochloride

standard testing procedure zinc sulphate

standard testing procedure croscarmellose sodium

standard testing procedure colour erythrosine supra

standard testing procedure magnesium hydroxide

standard testing procedure diclofenac sodium

standard testing procedure dibasic calcium phosphate

standard testing procedure cyanocobalamin

standard testing procedure cholecalciferol

standard testing procedure Calcium carbonate oyster shell powder

standard test procedure Calcium Citrate

standard testing procedure Bronopol

standard testing procedure Bromhexine Hydrochloride

Standard Testing Procedure diclofenac sodium injection

Standard Testing Procedure Drotaverine Hydrochloride injection

analysis of Procyclidine HCl 5 mg Tablet

analysis of silodosin 8 mg capsule

Method of Analysis Ceftriaxone and Sulbactam For Injection

Analysis of Glimepiride and Metformin Hydrochloride (SR) Tablets

General Test Procedure Melting Range and Freezing Point

General Test Procedure Weight per ML and Specific Gravity

General Test Procedure Distillation Range

General Test Procedure Non Volatile Matter and Residue on Evaporation

General Test Procedure Clarity of Solution

General Test Procedure Limit Test Chloride

General Test Procedure Limit Test Iron

General Test Procedure Limit Test Heavy Metals

Exit mobile version