SOP on Procedure of volumetric solution preparation and standardization

SOP on Procedure of Volumetric solution preparation and standardization

To lay down a procedure for preparation and standardization of volumetric solution.

Scope Of SOP: This SOP is applicable for the preparation and standardization of volumetric solutions in a quality control laboratory in a pharmaceutical company name with location.


An officer or above of QC Laboratory is responsible for following the procedure mentioned in this SOP.

Accountability: The Head QC and QA shall be accountable for compliance of SOPs.

Abbreviations and Definitions:

VS:Volumetric solutions

RSD: Relative Standard Deviation


Volumetric solutions, known also as Standard Solutions, are solutions of reagents of known concentration intended primarily for use in quantitative determinations. Concentrations are usually expressed in terms of normality.

Volumetric solution preparation:

Prepare a Volumetric solution of specific strength, wherever applicable,as per the procedure given in the appendix of Pharmacopoeia.

Volumetric solutions should not differ from the prescribed strength by more than 10% and the Normality /Molarity should be determined in triplicate and so that RSD below 1.0 %.

For the preparation of dilute Normal and Molar solution, if required, solution of standard Normality / Molarity may be diluted in exact proportion and same shall be used, and should be re-standardized either as directed for the primary standards or by comparing with other volumetric solutions having a known concentration.

When a solution is used in an assay in which the end point is determined by an electrochemical process (potentiometrically) the solution must be standardized in the same way.

Volumetric solution shall be used within one month of preparation. Incase of any unusual observation, (Crystallization, sedimentation, Haziness and decolourisation) it shall be discarded.

Assign Sr number for volumetric solutions as follows



VS : stand for volumetric solutions

XX : stand for serial number

YY : stand for year

To ensure the stability of the volumetric solution, check the Normality and Molarity of the solution in triplicate at once in every 5 days for one month and record the same. The RSD of the all observations must be in 1.0 %.

Standardization: Normality and Molarity determine in triplicate. The average of the three titration shall be considered for calculation. Record raw data in Logbook.

Make entry for Volumetric Standard Solution Logbook.

Re-standardization shall be done once in fortnightly.

After preparation & standardization of Volumetric solutions, paste the Label on the respective glass bottles and storage as per specified requirement or room temperature.

Forms and Records (Annexures)

Preparation and standardization of volumetric solution logbook-Annexure -I


Master copy – Quality Assurance

Controlled copies – Quality Assurance & Quality Control


Date Revision Number
   Reason for Revision
00 New SOP

                                   Annexure -I

Preparation  and Standardization of Volumetric Solution Logbook

Date of preparation B.No of    Primary Stand Date of


Wt.of primary    standard Burette Reading/ Normality / Molarity Mean Normality/ Molarity Valid

up to


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About Pharmaceutical Guidanace

Ms. Abha Maurya is the Author and founder of pharmaceutical guidance, he is a pharmaceutical Professional from India having more than 18 years of rich experience in pharmaceutical field. During his career, he work in quality assurance department with multinational company’s i.e Zydus Cadila Ltd, Unichem Laboratories Ltd, Indoco remedies Ltd, Panacea Biotec Ltd, Nectar life Science Ltd. During his experience, he face may regulatory Audit i.e. USFDA, MHRA, ANVISA, MCC, TGA, EU –GMP, WHO –Geneva, ISO 9001-2008 and many ROW Regularities Audit i.e.Uganda,Kenya, Tanzania, Zimbabwe. He is currently leading a regulatory pharmaceutical company as a head Quality. You can join him by Email, Facebook, Google+, Twitter and YouTube

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