Now You Know Water Hardness Test Method

Water Hardness Test Method

Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com

Introduction:
The presence of Calcium, Magnesium salt i.e bi-carbonates, sulphates, Chloride in water is called causes of hardness of water. Such soluble salt are chloride, nitrites, sulphates and bicarbonate of these metal heavy metal like Fe and Al also can tribute in the hardness of water. The water which contains these salt is called hard water. Hard water caused many problems during wet processing. There are two types of hardness: Temporary hardness and permanent hardness.

Water hardness testing

Hardness Test Method:
There are few methods for measuring water hardness. In this article I have explained three methods of measuring hardness of water.

a. Ammonia- Ammonium Chloride Buffer Solution:
Dissolve 67 gms. Ammonium Chloride to 570 ml concentrated Ammonia and then make up the solution to one Litre by distilled water.

b. Erichrome Black – T Solution:
Dissolve 75 ml Tri-ethanolamine to 25 ml Ethanol and then add 0.5 gm Erichrome Black – T in 100 ml volumetric flask.

c. 0.01M EDTA standard solution:
Dissolve 3.722 gms EDTA(Ethylene Diamine Terra Acetic Acid) to one Litre distilled water.

Procedure:
Take 100 ml of Sample in a Beaker + 5 ml (NH4)Cl buffer solution + 1-2 drops of Black – T and Titrate it against EDTA (0.01M)

Calculation:
1 ml of 0.01 M EDTA = 1 mg.
Total Hardness= Volume of EDTA * 10 ppm.

100 ml Sample are taken. But for ppm sample will be 1 litre, so the result will be 10 times more.

You can also like:

1. Water Consumption in Textile Industry
2. Water Purification Process for Textile Wet Processing Industry
3. Water Hardness Test Method
4. Determination of Hardness of Water / Water Hardness
5. Water Treatment Plant (WTP) | Process Sequence of Water Treatment Plant
6. Characteristics of Effluent Water in Textile Wet Processing Industries
7. Problem Caused by Hard Water in Wet Processing/Dyeing Industry
8. Lime-Soda Water Softening Process
9. Base Exchange (Ion Exchange) Water Softening Process
10. Demineralization Process of Water Softening
11. What is Hardness of Water? | Potential Problem Caused by Hard Water in Textile Wet Processing Industry
12. Some Important Parameters of Water for Textile Wet Processing Industry 
13. Implementation of Effluent Treatment Plants for Waste Water & Effect of Untreated on Environment 
14. Effluent Treatment Plant Process Sequence in Textile Industry  
15. Function of Different Units of Biological Effluent Treatment Plant (ETP)

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