Manganese testing in water systems is crucial for water quality management. Manganese is an essential nutrient but it is consuming excessive amounts is highly toxic.Manganese can effect the flavour and colour of water. 

Here we take Drinking Water to test the manganese,followed Periodate colorimetric Method.

Chemicals & Equipments Used in Manganese Testing in Water

Chemicals Used

• Dilute Sulphuric Acid(1:1) :Provides the acidic medium necessary for oxidation, prevent precipitation of manganese compounds.To prepare a (1:1) dilute sulfuric acid solution, mix equal parts by volume of concentrated Sulphuric Acid and distilled water.
• Nitric Acid : Nitric Acid is used in drinking water testing to digest and break down organic matter.
• Distilled Water: Prevents contamination from trace metals or ions that may interfere with color development.The conductivity of distilled water should be <5 μS/cm to prevent contamination.
• Phosphoric Acid: Phosphoric acid provides the necessary acidic environment to prevent side reactions.
• Potassium Periodate: In drinking water testing, Potassium Periodate is used as a powerful oxidizing agent in the standard periodate colorimetric method.
• Standard Manganese Solution: Solutions of known manganese concentration are measured to establish the relationship between absorbance and concentration.Dissolve 3.077 g of manganese sulfate monohydrate in distilled water and diluting the solution to 1 liter in a volumetric flask. A few drops of dilute sulfuric acid may be added for stability.

Equipments Used

• Volumetric Flask(1litre,50 ml): Used for precise dilution.
• Pipettes(1ml & 2ml)-Used for transferring exact volumes of reagents and samples.
• UV-Vis Spectrophotometer :Measures the absorbance at a wavelength of around 525 nm.
• Hot Plate :For boiling the sample after acidification to dissolve soluble matter.

Testing Process Of Manganese Estimation in Water

To a 500 ml conical flask measure a suitable volume(250 ml) of the well mixed sample .
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Add 2-3 ml mixture of nitric acid & 1 ml dilute sulphuric acid and heat the mixture,until all traces of organic matter are completely destroyed.
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After that, Add 10 ml distilled Water, 5 ml of the phosphoric acid and 0.2 gm potassium periodate ,bring to the boil until it reduces to 30 ml.
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Cool the mixture in room temperature.
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Transfer into a volumetric flask ,adjust the volume to 50 ml with distilled water and mix well.
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If manganese is present ,it turns into pink colour to violet.
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Take the absorbance at 525nm through spectrophotometer.

Calculation:

Manganese(mg/L) = (Sample Absorbance-Blank Absorbance) x Calibration Factor/ Weight of Sample

Why Testing of Manganese is Important for Water?

• It detects the quality & safety of the water.
• To determine the concentration of manganese in a water.Excess manganese can give water a metallic taste.
• To avoid health problems caused by excess manganese intake.Too much manganese can be harmful, especially for children.
• To meet environmental and regulatory standards for water quality testing.
• Excess manganese can scale formation on pipe,boiler or any other metallic equipments.

Handling mistakes should avoided during Manganese Test in Water

• Using contaminated glassware may give falsely high manganese results. Proper cleaning Process described previously.
• Impurities or degraded reagents affect colour development and absorbance.
• Perform color measurement within recommended time.
• Overheating can cause loss of volatile mineral, giving false values.
• Maintain correct acidic conditions, which may cause improper result.

Conclusion Of Manganese Testing In Water

Manganese detection in water using Periodate Colorimetric method is a simple, sensitive, and reliable technique.Regular monitoring helps maintain safe water quality and prevents health and environmental risks.By following the above-mentioned method, you can easily test the Manganese at any laboratory or manufacturing industry with the availability of the equipments and chemicals. Furthermore, if you can’t understand the procedure, you can check our real-time photo attached with this writing, which visually guides you through each step and enhances your understanding. Additionally, for those who prefer professional assistance or require more advanced testing, you can also reach out to Pro Research & Testing Laboratory for testing purposes.

FAQ about Manganese Testing in Water

Q: What is the role of Nitric acid in this test?
A: Nitric Acid is used in drinking water testing to digest and break down organic matter.

Q: Why is this test important for consumers?
A: This is important for consumers because it detects the quality & safety of the water.

Q:What is the major mistake should avoided during Manganese Test in Water?
A:To measure the colour within recommended time is the major mistake should avoided during Manganese Test in Water as colour will start degraded after a certain time.

Q: What is the method & wavelength is used for Manganese measurement?
A: The Periodate colorimetric Method is commonly measured at a wavelength of 525 nm.

Q: What equipment is used for colour measurement of the sample?
A: UV-Vis Spectrophotometer is used for colour measurement of the sample.

How We Verified This Testing/Research Procedure :

This testing procedure is done under qualified analyst .Continually monitored by expertise.Repeatedly testing is always done to get accurate result.

Written by
Ankita Samanta (M.Sc Microbiology,Vidyasagar University)
Designation – Junior Microbiologist

Reviewed by
Anwesha Das (M.Sc Microbiology,BU)
Designation – Microbiologist

Verified By
Dr. Jyotirmoy Kumar Dey (Phd,Chemistry)
Designation – Senior/Chief Chemist
Experience – 25 Years +