According to AOCS CD 8b (Peroxide Value Acetic Acid-Isooctane Method); ISO (Animal and vegetable fats and oils. SAMPLING AND ANALYSIS OF COMMERCIAL FATS AND OILS AOCS Official Method Cd 8b Revised Peroxide Value Acetic. AOCS has standardized a method for. PV determination with chloroform (Cd. 8- 53) and with isooctane (Cd 8b). The latter method uses a mixture of acetic.
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The acid value AVperoxide value PVoxidative stability, fatty aovs composition, phytosterol content, and tocochromanol content were measured for both fresh and stored oils. The deep blue color produced must be discharged by 0. Page 3 of 3. Test the saturated KI solution by adding 2 drops of starch solution to 0.
The following are suitable starches: The blank titration must not exceed 0. Peroxide value Acetic Acid-Isooctane Method. Replaced by Cd 8b We are a non-profit group that run this website to share documents.
AOCS CD 8b – 90 Peroxido
Allow to stand for 5 min and then add mL of distilled water. Continue the titration until the yellow iodine color has almost disappeared. Acetic acid in the pure state is moderately toxic by ingestion and inhalation. If stored under refrigeration, the starch solution should be stable for about 2—3 weeks. Prolonged inhalation or ingestion can lead to liver and kidney damage and may be fatal.
Avoid contact with the skin. The values presented may not be applicable to matrices other than those presented and may not be representative for other concentrations. KI in mL water and rotate to mix.
The highest tocochromanol and phytosterol content were observed in wheat germ and blackcurrant seed oil, and the lowest in black cumin and dill seed oil. Store in the dark when not in use. Page 2 of 2.
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Oacs with sodium thiosulfate solution, shaking continuously until yellow color has almost disappeared. Potassium iodide KI solution—saturated, prepared fresh each day analysis is performed by dissolving an excess of KI in recently boiled distilled water about The test should be carried out in diffuse daylight or in artificial light shielded from a direct light source.
Low actinic red or amber container, about 50 mL to mL capacity. Swirl to dissolve the sample.
Allow the solution to stand for exactly 1 min, thoroughly shaking the solution at least three times during the 1 min, and then immediately add 30 mL of distilled water.
Add the thiosulfate solution dropwise until the blue color just disappears see Notes, 3 and 4.
AOCS CD 8b – 90 Peroxido – Free Download PDF
Weigh the test portion Table 1 into a mL Erlenmeyer flask with glass stopper and add 50 mL of the 3: If stored under refrigeration, the starch solution should be stable for about 2—3 weeks. Titrate with sodium thiosulfate solution, shaking continuously until yellow color has almost disappeared.
Sodium thiosulfate solution, 0. Decant the oil into a clean beaker and filter through a Whatman no. Test for sensitivity—Place 5 mL of starch solution in mL xd water and add 0.
Burette—with 25 mL or 50 mL, class A, graduated in 0. Test the saturated KI solution by adding 2 drops of starch solution to 0. Burette—25 mL or 50 mL, class A, graduated in 0. Continue the titration until the yellow iodine color has almost disappeared.
It is a strong oxidizing agent and a dangerous fire risk when in contact with organic chemicals. A fume hood should be used at all times when using chloroform. A properly operating fume hood should be used cs working with this solvent.