SOP of DM Water Analysis | DM Water Testing Methods

The importance of SOP for water analysis in the industry and testing procedure or methods DM water. Refined Water is the main crude material utilized in drug-producing.  Because of the basic idea of water and water frameworks, Purified Water Testing is an administrative necessity to perform routine microbiological and substance quality appraisals.


1.1  To Lay down the Procedure for the Analysis of DM Water.

2.0  SCOPE

2.1  This procedure is applicable to the Analysis of  DM Water  of  quality Controlled in QC Lab


3.1     QC Chemists Lab analyst follows the SOP.

3.2     Head- QA & QC for implementation of SOP.


Collect the Sample as per Standard Operating. Procedure for water sampling and analysis

For Chemical Parameter as per their specification.

Preparation of Bang's Reagent for Conversion and Analysis: A Step-by-Step Guide

Purified Water Testing As Per USP & IP

Lab regents bottle blue ,red

5.0  Water quality testing procedures.

Chemical analysis methods used for water analysis

Purified water chemical analysis | Standard analytical procedure for water Analysis.

Acidity or alkalinity: To 10 ml, freshly boiled & cooled in a borosilicate glass flask, add 0.05 ml of methyl red solution, the resulting solution is not red. To 10 ml add 0.1 ml of bromothymol blue; the resulting solution is not blue.

pH of water

Ammonium in water: To 20 ml add 1 ml of alkaline potassium mercury iodide solution & allow to stand five minutes. When viewed vertically the solution is not more intensely coloured than a solution prepared at the same time by adding 1 ml of alkaline potassium Mercuri – iodide solution to a mixture of 4.0 ml of ammonium standard solution ( 1 ppm NH4 & 16.0 ml of ammonium free water (0.2 ppm)

Calcium & Magnesium in water: To 100 ml add 2 ml of ammonium buffer ph10.050 mg of mordant black II mixture & 0.5 ml of 0.01M disodium edentate, the pure blue colour is produced.

DM water SOP

Heavy metals in water: Evaporate 150 ml to 15 ml on a water bath; 12 ml of the solution complies with the limit test for heavy metals, Method D (0.1 ppm). Use lead standard solution (1 ppm Pb ) to prepare the standard.

Chlorides in water: To 10 ml add 1 ml of 2 M Nitric Acid and 0.1M  silver nitrate, the appearance of the solution does not change for at least 15 minutes.

Nitrates in water: To 5 ml in a test tube immersed in ice add 0.4 ml of diphenylamine solution & drop-wise with shaking, 5 ml of sulphuric acid. Transfer the tube to a water bath at 50 ° C & allow it to stand for 15 minutes. Any blue colour in the solution is not more intense than that in a solution prepared at the same time & in the same manner using a mixture of 4.5 ml of nitrate-free water & 0.5 ml of nitrate standard solution (2 ppm NO3) (0.2 ppm).

Sulphates in water: To 10 ml add 0.1 ml of 2 M hydrochloric acid & 0.1 ml of barium chloride solution. The appearance of the solution does not change for at least one 1hour.

Oxidisable substances in water: To 100 ml add 10 ml of 1 M sulphuric acid & 0.1 ml of 0.02 M potassium permanganate & boil for 5 minutes; the solution remains faintly pink.

Residue on evaporation of water: Evaporate 100 ml to dryness on a water bath & dry to constant weight at 105°.The residue weighs not more than

 1 mg (0.001%).

Ph:   5.0 to7.0

Conductivity:  < 5µS/cm


6.1   Daily basis.


SOP:     Standard Operating Procedure

QA:      Quality Assurance

QC:      Quality Control

DM:     DE-Mineralized


In House

Purified water testing as per ip



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