regulatory compliance in volumetric analysis.

2. Scope

This SOP applies to all analysts preparing and using volumetric solutions such as hydrochloric acid, sodium hydroxide, sulfuric acid, EDTA, and other reagents required for titration-based methods in AMD laboratories.

3. Responsibilities

• Analyst: Prepares and standardizes volumetric solutions, maintains records, and ensures proper labeling.
• AMD Supervisor: Reviews standardization data and approves volumetric solution usage.
• QA Personnel: Verifies documentation and ensures compliance with applicable regulations and procedures.

4. Accountability

The Head of Analytical Method Development is accountable for implementing and ensuring compliance with this SOP across the department.

5. Procedure

5.1 General Precautions

• Use AR-grade or equivalent reagents for solution preparation.
• Prepare solutions in cleaned and calibrated volumetric glassware.
• Label all prepared solutions with name, concentration, date of preparation, validity, and analyst initials.
• Assign solution ID numbers as per Annexure-1 format.

5.2 Preparation of Volumetric Solutions

1. Weigh solute using a calibrated balance.
2. Dissolve in suitable solvent (usually purified water) and transfer to a volumetric flask.
3. Make up to the required volume using solvent.
4. Mix thoroughly and allow to equilibrate to room temperature before use.

5.3 Standardization of Volumetric Solutions

1. Choose a suitable primary standard with known purity and stability (e.g., potassium hydrogen phthalate, sodium carbonate).
2. Weigh accurately as per stoichiometric equivalence for titration.
3. Titrate with prepared volumetric solution using appropriate indicator.
4. Perform a minimum of three concordant titrations (RSD ≤ 1.0%).
5. Calculate exact normality/molarity of the solution using the formula:
   N = (Weight × 1000 × Factor) / (Volume × Equivalent Weight)
6. Record all observations in the Standardization Log (Annexure-2).

5.4 Re-standardization and Validity

• Store standardized solutions under recommended conditions.
• Re-standardize solutions weekly or before use if not used within 7 days.
• Assign validity based on stability or regulatory guidance (generally 1 month unless otherwise validated).

5.5 Labeling of Volumetric Solutions

Each label must include the following:

• Solution Name and Concentration
• Solution ID No.
• Date of Preparation and Validity
• Initials of Analyst
• Standardization Factor (if applicable)

5.6 Handling and Disposal

• Handle corrosive and toxic chemicals with gloves, lab coats, and safety goggles.
• Dispose expired or unused solutions as per SOP on chemical disposal (refer SOP/QA/067/2025).

6. Abbreviations

• AR: Analytical Reagent
• QA: Quality Assurance
• SOP: Standard Operating Procedure
• AMD: Analytical Method Development
• RSD: Relative Standard Deviation

7. Documents

1. Annexure-1: Volumetric Solution ID Register
2. Annexure-2: Standardization Log
3. Annexure-3: Preparation and Re-standardization Log

8. References

• USP General Chapter <795> and <841>
• ICH Q2(R1) – Validation of Analytical Procedures
• 21 CFR Part 211.160 – Laboratory Controls

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Kajal Rawat	Neeraj Mehra	Dr. Harshita Goyal
Designation	Research Associate	QA Reviewer	Head – AMD
Department	Analytical Method Development	Quality Assurance	Analytical Method Development

11. Annexures

Annexure-1: Volumetric Solution ID Register

ID No.	Solution	Concentration	Date Prepared	Prepared By	Expiry
VS-HCL-001	Hydrochloric Acid	0.1 N	01/06/2025	KR	01/07/2025

Annexure-2: Standardization Log

Date	Solution ID	Primary Std.	Volume Used (mL)	Wt. (mg)	Normality	Initials
01/06/2025	VS-NaOH-002	KHP	23.6	204.5	0.1012 N	KR

Annexure-3: Preparation and Re-standardization Log

Date	Solution ID	Prepared By	Standardized By	Reviewed By	Remarks
01/06/2025	VS-EDTA-003	KR	KR	NM	Prepared fresh; stored at 4°C

Revision History

Revision Date	Revision No.	Details	Reason	Approved By
01/06/2025	2.0	Added re-standardization procedure and revised labeling format	GMP Compliance	Dr. Harshita Goyal
10/06/2022	1.0	Initial version	New SOP	QA Head