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Activated Carbon Astm

ASTM D4607 outlines a method for determining the iodine number of activated carbon, which indicates the amount of iodine adsorbed per gram of carbon. The procedure involves preparing iodine and sodium thiosulfate solutions, adsorbing iodine onto the carbon sample, and titrating to measure the residual iodine. The iodine number typically ranges from 500 to 1200 mg/g for commercial activated carbons.

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593 views2 pages

Activated Carbon Astm

ASTM D4607 outlines a method for determining the iodine number of activated carbon, which indicates the amount of iodine adsorbed per gram of carbon. The procedure involves preparing iodine and sodium thiosulfate solutions, adsorbing iodine onto the carbon sample, and titrating to measure the residual iodine. The iodine number typically ranges from 500 to 1200 mg/g for commercial activated carbons.

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hassan boxer
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© © All Rights Reserved
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ASTM D4607: Standard Test Method for Determination of Iodine Number of Activated Carbon

Objective:

To determine the iodine number of activated carbon, which is the milligrams of iodine adsorbed per gram
of carbon when the residual iodine concentration in the filtrate is 0.02 N.

Materials Required:

• Activated carbon sample (100 mesh recommended)


• Iodine crystals (I₂)
• Potassium iodide (KI)
• 0.1 N Sodium thiosulfate solution (Na₂S₂O₃)
• Starch indicator solution
• Distilled water
• Whatman No. 42 filter paper
• Conical flasks, burette, pipettes, and other standard titration equipment

Preparation of Reagents:

Iodine Solution (~0.1 N):

• Dissolve 2.7 g of iodine (I₂) and 4.1 g of potassium iodide (KI) in distilled water.
• Dilute to 1 liter with distilled water.

Sodium Thiosulfate Solution (0.1 N):

• Prepare standard 0.1 N Na₂S₂O₃ solution.

Starch Indicator:

• Prepare freshly before use by dissolving 1 g of starch in a small amount of cold water and adding to
100 mL boiling water.

Procedure:

1. Sample Preparation:

2. Weigh 0.5 g to 1.0 g of activated carbon accurately.

3. Adsorption:

1
4. Transfer the carbon into a flask containing 100 mL of iodine solution.
5. Shake vigorously for 30 seconds to 1 minute.

6. Allow the carbon to settle or immediately filter through Whatman No. 42 filter paper.

7. Titration:

8. Pipette 50 mL of the filtrate into a clean conical flask.


9. Add a few drops of starch indicator.

10. Titrate with 0.1 N sodium thiosulfate until the solution turns from dark blue to colorless.

11. Blank Titration:

12. Titrate 50 mL of fresh iodine solution (without carbon) as a blank using the same procedure.

Calculation:

(Vb − Vs ) × N × 126.93 × 1000


Iodine Number (mg/g) =
W
Where: -Vb = Volume of Na₂S₂O₃ used for blank (mL) - Vs = Volume of Na₂S₂O₃ used for sample (mL) - N =
Normality of Na₂S₂O₃ solution - W = Weight of activated carbon sample (g)

Notes:

• The iodine number typically ranges from 500 to 1200 mg/g for commercial activated carbons.
• Ensure all solutions are prepared freshly for accurate results.
• The test should be done quickly to prevent iodine loss due to volatilization.

References:

• ASTM D4607: Standard Test Method for Determination of Iodine Number of Activated Carbon

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