Determination of peroxide value by titration. How to Measure Peroxide value using autotitrator 2022-10-26

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Peroxide value is a measure of the concentration of peroxides in a substance, typically an oil or fat. Peroxides are compounds that contain an oxygen-oxygen bond, and they can be harmful to both human health and the stability of the substance in which they are present. Therefore, it is important to determine the peroxide value of oils and fats in order to ensure their quality and safety.

One way to determine the peroxide value of a substance is through titration. Titration is a laboratory technique in which a known concentration of a reagent, called the titrant, is added to a sample until a chemical reaction is complete. The volume of titrant needed to complete the reaction is then used to calculate the concentration of the substance being measured.

To determine the peroxide value of an oil or fat using titration, a sample of the substance is first placed in a flask or beaker. An indicator solution, such as potassium iodide, is then added to the sample. The indicator solution reacts with the peroxides in the sample to produce iodine, which changes the color of the solution.

Next, a standardized solution of sodium thiosulfate, also known as a titrant, is added to the flask or beaker. The sodium thiosulfate reacts with the iodine to produce a colorless solution. The volume of sodium thiosulfate needed to fully react with the iodine is measured using a burette, a precision instrument used to measure the volume of a liquid.

The peroxide value of the sample is then calculated using the following formula:

Peroxide value (meq/kg) = (Volume of sodium thiosulfate needed / Sample weight) x Normality of sodium thiosulfate

The normality of the sodium thiosulfate is a measure of its concentration, and it is typically provided with the standardized solution. The sample weight is typically measured in kilograms.

It is important to note that the peroxide value determined through titration is a measure of the concentration of peroxides present in the sample at the time of the analysis. Peroxides can continue to form over time, so the peroxide value of an oil or fat can change over its shelf life. Therefore, it is important to regularly test the peroxide value of oils and fats to ensure their quality and safety.

In conclusion, the determination of peroxide value by titration is a useful and precise method for measuring the concentration of peroxides in oils and fats. This information is important for ensuring the quality and safety of these products and can help to protect the health of consumers.

Using Redox Titration for the Determination of Hydrogen Peroxide in Sanitizers

determination of peroxide value by titration

Method Unless otherwise specified in the individual monograph, weigh accurately about 5 g of the substance under examination, transfer to a 250-ml glass-stoppered conical flask, add 30 ml of a mixture of 3 volumes of glacial acetic acid and 2 volumes of chloroform, swirl until dissolved and add 0. The iodine solution should now be much darker — almost black. There is NO NEED TO WEIGH THIS ACCURATELY so just use a top pan balance. You can add the thiosulphate fairly quickly in the early stages but you will need to add the thiosulphate more slowly as the colour of the iodine get more and more yellow. » 5% Potassium Iodide Solution. Sample Solution The post The Determination of Hydrogen Peroxide by Iodometric Titration.

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Titration peroxide value

determination of peroxide value by titration

The volume of thiosulphate required to react with the iodine solution is the difference between the final reading and the initial reading. The Determination of Hydrogen Peroxide H 2O 2 concentration is crucial to product quality control. Note: we have omitted the potassium ion, KP+P, from this reaction since it would occur on both sides of the equation and so it does not take part in the reaction. Note: we have omitted the potassium ion, KP+P, from this reaction since it would occur on both sides of the equation and so it does not take part in the reaction. In this application note, we explain how to perform a fast, simple and safe measurement procedure using. Record the reading on the burette again to the nearest 0. Source: Mettler Toledo - Titration Disinfectant R1:Content, % Sanitizer R1: Content, % 1 2.


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The Determination of Hydrogen Peroxide by Iodometric Titration.

determination of peroxide value by titration

You can add the thiosulphate fairly quickly in the early stages but you will need to add the thiosulphate more slowly as the colour of the iodine get more and more yellow. Swirl the flask in order to dissolve the potassium iodide in the sulphuric acid. Hydrogen Peroxide is used in a large variety of applications and industries as its consumption creates only oxygen and water, which is environmentally friendly. In this experiment you will use a titrimetric method to determine the amount of hydrogen peroxide in a given solution. Source: Mettler Toledo - Titration R1:Content, % 1 1. » 1% Starch Solution. Throughout your experiment, note any colours that are observed in your lab book.

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[Solved] The Determination of Hydrogen Peroxide by Iodometric Titration.

determination of peroxide value by titration

Use a cork, rubber bung or parafilm to close the top of the conical flask and allow the mixture to stand for 15 minutes. Hydrogen peroxide can act as both an oxidizing agent and a reducing agent depending upon the conditions of the reaction. EXPERIMENTAL In this experiment you will use titrimetric analysis to determine the concentration of hydrogen peroxide in a solution. Record the reading on the burette to the nearest 0. Using Redox Titration for the Determination of Hydrogen Peroxide in Sanitizers. The peroxide value is the number of milliequivalents of active oxygen that expresses the amount of peroxide contained in 1000 g of the substance.


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Determination of Peroxide Value : Pharmaguideline

determination of peroxide value by titration

In this experiment you will use a titrimetric method to determine the amount of hydrogen peroxide in a given solution. Peroxides are also thought to contribute to aging of skin and they are also a source of free radicals thought to be partly responsible for some cancers. Sponsored Content by Mettler Toledo - Titration Jan 21 2021 Hydrogen peroxide H 2O 2 is a chemical compound with strong oxidizing capabilities, which acts against a variety of microorganisms, including bacteria, viruses, fungi, yeasts and spores 1,2. The iodine produced reacts with sodium thiosulphate and the amount of thiosulphate required can be used to calculate the amount of iodine present and hence the amount of hydrogen peroxide in the solution. Pour sodium thiosulphate into a burette. Group 1 2 3 4 Initial volume cm3 1.

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How to Measure Peroxide value using autotitrator

determination of peroxide value by titration

It can lead to cellular damage and also diseases like Diabetes, Alzheimer. Repeat steps 2 — 13 until you get THREE consistent results i. While a concentration of 3% H 2O 2 is a potent disinfectant, up to 0. Allow to stand for exactly 1 minute, with occasional shaking, add 30 ml of water and titrate gradually, with continuous and vigorous shaking, with 0. There is NO NEED TO WEIGH THIS ACCURATELY so just use a top pan balance. The experiment is quite short and so you have plenty of opportunity to repeat the titrations until you get consistent results. Many different techniques can be used to determine H 2O 2 concentration, such as titration.

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Determination of Hydrogen Peroxide Concentration

determination of peroxide value by titration

Other White Papers by this Supplier. When the iodine solution becomes straw coloured pale yellow add a few drops of starch solution. The experiment is quite short and so you have plenty of opportunity to repeat the titrations until you get consistent results. Consuming rancid oil has an adverse effect on human health. Peroxide value gives the measure of rancidity in oils, fats and margarine. Note the concentration of the sodium thiosulphate solution supplied. Comment on your results.

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Determination of peroxide value

determination of peroxide value by titration

THEORY Titrimetry, or titrimetric analysis, is an example of a so-called classical method of analysis. Group 1 2 3 4 Initial volume cm3 1. This means that if we know how much the number of moles thiosulphate we need to react with the iodine we can calculate how much hydrogen peroxide was in the solution we started with. Continue adding the thiosulphate solution until the iodine solution becomes colourless. Sample results a Standard 1.

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