Total Organic Carbon

Good Essays
EXPERIMENT 3

DETERMINATION OF ORGANIC MATTER BY WALKEY- BLACK WET OXIDATION METHOD

OBJECTIVE: This method determines the percentage of organic carbon and organic matter in the soil.
INTRODUCTION
The soil sample is suspended in standard potassium dichromate (K2Cr2O7) solution to which concentrated sulphuric acid is then added. The heat generated on adding the sulphuric acid and the presence of chromic acid creates strong oxidizing conditions. The excess chromic acid is back titrated in the presence of a suitable indicator. 2Cr2O72- + 16 H+ + 3C = 4Cr3+ + 8H20 +3CO2

CHEMICALS AND REAGENTS:
i) 1N K2Cr2O7 : Dissolve 49.04 g K2Cr2O7 (dried at 105ºC) in water and make it to 1 Litre ii) Concentrated sulphuric acid, Concentrated Phosphoric Acid iii) Diphenylamine Indicator: Dissolve 1 g of Diphenylamine in 50ml of concentrated sulphuric acid. iv) 1N Ferrous Sulphate( FeSO4.7H2O): Dissolve 278 g of Ferrous Sulphate in approximate 800 mL of Deionized water and 15 mL Concentrated sulphuric acid and make it to1 litre with Deionized water.

PROCEDURE 1. Grind the soil sample thoroughly. 2. Place 1g of air oven dry soil in a 500 mL conical flask. 3. Add exactly 10ML of 1N K2Cr2O7 solution and swirl gently to wet the sample thoroughly. 4. Carefully add 20mL of concentrated sulphuric acid and swirl thoroughly to mix. 5. Allow the mixture to stand for 30 minutes. 6. Add 200mL Distilled water to the flask. 7. Filter and collect the filterate in 250mL conical flask. 8. Add 10 mL of Concentrated Phosphoric Acid and 5 drops of Diphenylamine Indicator. ( Add 0.2g sodium fluoride to the filterate if available) 9. Firstly Blank potassium dichromate is titrated with 1N Ferrous Sulphate using small increment additions. Continue adding until the color of indicator changes to green. 10. Record the volume needed to reach the end point. 11.

You May Also Find These Documents Helpful

  • Good Essays

    Carbon

    • 585 Words
    • 3 Pages

    Carbon fibre-reinforced carbon (aka carbon–carbon, abbreviated C/C) is a composite material consisting of carbon fibre reinforcement in a matrix of graphite. It was developed for the nose cones of intercontinental ballistic missiles, and is most widely known as the material for the nose cone and wing leading edges of the Space Shuttle orbiter. It has been used in the brake systems of Formula One racing cars since 1976; carbon–carbon brake discs and pads are a standard component of Formula One brake…

    • 585 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Carbon

    • 592 Words
    • 3 Pages

    CARBON AND ITS COMPOUNDS Covalent Bond: A chemical bond formed by the sharing of two atoms. Types of Covalent Bonds i. Single Covalent Bond: A type of bond formed by sharing of one pair of electrons between two atoms. ii. Double Covalent Bond: A type of bond formed by sharing of two pairs of electrons between two atoms. iii. Triple Covalent Bond: A type of bond formed by sharing of three pairs of electrons between two atoms. Properties of Covalent Bond i. Their B.P. and M.P…

    • 592 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    CARBON CARBON MULTIPLE BOND PRESENTED BY: WASIQUE AZHAR MSC CHEM (2 SEM) Some basic concept Electrophile : a species with a region of positive or partial positive charge electron-poor Nucleophile: a species with a region of negative or partial negative charge electron-rich TO LERN OBJECTIVE : Elecrophilic Addition to carbon-carbon double bond Stereochemistry of Elecrophilic addition reaction Hydrogenation of double and triple bond Nucleophilic Addition to carbon-carbon double…

    • 517 Words
    • 3 Pages
    Satisfactory Essays
  • Powerful Essays

    Carbon Cycle

    • 1789 Words
    • 8 Pages

    Topic 9 - The Carbon Cycle Aspects of the carbon cycle are similar to the hydrologic cycle because both are good examples of “Interactions between the systems". Textbook – topic not covered in text. http://www.windows2universe.org/earth/ The Carbon Cycle Neglecting the small amount of carbon (C) added to Earth by meteorite impacts, there is a fixed amount of carbon on Earth (~800,000 billion tonnes). All living things are made of carbon but carbon is also a part of the ocean, air, and…

    • 1789 Words
    • 8 Pages
    Powerful Essays
  • Good Essays

    carbon and its compounds

    • 2800 Words
    • 12 Pages

    Carbon and Its Compounds Carbon: Introduction Atomic Number: 6 Electronic Configuration: 2, 4. Valence electrons: 4 Property: Non-metal Abundance:- Carbon is the 4th most abundant substance in universe and 15th most abundant substance in the earth’s crust. Compounds having carbon atoms among the components are known as carbon compounds. Previously, carbon compounds could only be obtained from a living source; hence they are also known as organic compounds. Bonding In Carbon:- The Covalent…

    • 2800 Words
    • 12 Pages
    Good Essays
  • Powerful Essays

    Carbon and Its Compounds

    • 7032 Words
    • 29 Pages

    Assignments in Science Class X (Term II) 4 Carbon and its Compounds IMPORTANT NOTES 9. Unsaturated organic compounds : Organic compounds in which a double or a triple bond exists between two carbon atoms in a carbon chain, are called unsaturated organic compounds. 10. Hydrocarbons : Organic compounds which contain only carbon and hydrogen atoms are called hydrocarbons. 11. Straight chain hydrocarbons : Hydrocarbons, in which all the carbon atoms are linked to one another in a straight chain…

    • 7032 Words
    • 29 Pages
    Powerful Essays
  • Good Essays

    The Carbon Cycle

    • 1099 Words
    • 5 Pages

    destructive nature. I will start by describing the carbon cycle and how elements of my lifestyle impact the cycle. Photosynthesis converts the Carbon dioxide gas that exists in the atmosphere and in dissolved water to organic carbon. Organic carbon is brought back into carbon dioxide gas by a process called respiration. There are sources of organic carbon underground in the form of fossil fuels, human emissions and volcanic activity brings the stored carbon back into the cycle. As a human being who feed…

    • 1099 Words
    • 5 Pages
    Good Essays
  • Best Essays

    The Carbon Cycle

    • 3139 Words
    • 13 Pages

    The Carbon Cycle The element Carbon is the principle block for the organic compounds that make up life. This is because the study of the Carbon Cycle draws upon theories from biology, chemistry, geology and oceanography in order to understand the movement of carbon throughout the atmosphere, hydrosphere, and geosphere. Carbon is made up of four electrons that are able to form with each other; this causes the many different forms of carbon. The most popular form of carbon is carbon dioxide; this…

    • 3139 Words
    • 13 Pages
    Best Essays
  • Good Essays

    Carbon Cycle

    • 441 Words
    • 2 Pages

    Carbon Cycle Living organisms are significant in the recycling of numerous elements contained in an ecosystem. One of the elements is carbon. Carbon is nonmetal, forms over ten million different compounds, found in minerals, oceans, and is the main component of biological compounds. So how do living organisms and their biochemical reactions contribute to the recycling of carbon? Carbon moves through the ecosystem in a cycle, in which the living organisms take and release…

    • 441 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Carbon and Its Compounds

    • 261 Words
    • 2 Pages

    Carbon and Its Compounds Carbon: Introduction Atomic Number: 6 Electronic Configuration: 2, 4 Valence electrons: 4 Property: Non-metal Abundance: Carbon is the 4th most abundant substance in universe and 15th most abundant substance in the earth’s crust. Compounds having carbon atoms among the components are known as carbon compounds. Previously, carbon compounds could only be obtained from a living source; hence they are also known as organic compounds. Bonding In Carbon: The Covalent Bond…

    • 261 Words
    • 2 Pages
    Satisfactory Essays