Permanganate test method

Two oxidants commonly used are chlorine and potassium permanganate. The Roe chlorine number, the uptake of gaseous chlorine by a known weight of unbleached pulp (ie. Technical Association of the Pulp and Paper Industry (TAPPl) Standard Method T202 ts-66) has been superseded by the simpler hypo number (ie, TAPPl Official Test Method T253 om-86), eg, chlorine consumption in treatment of the pulp with acidified sodium or calcium hypochlorite. 

The reaction with permanganate constitutes a valuable and much-used test for unsaturation in an organic compound. The substance is dissolved in cold alcohol, a few drops of sodium carbonate solution are added, and then a drop.of dilute permanganate solution. Rapid disappearance of the red colour indicates the presence of a double bond. The Baeyer test can also be carried out in pure glacial acetic acid, which is stable towards permanganate. Another method of detecting double bonds is by the decolorisation of bromine. As a rule, chloroform is used as solvent. 

The Sir Galahad has been used in many locations around the world. For example, Cameron et al. [11] have used the instrument to vahdate plant operations in Thailand. In this apphcation the Sir Galahad was compared initially with other systems. Acidic vapour was found to cause false positive results in the other systems, whereas the Sir Galahad provided consistently rehahle data. Tests have recently been carried out to compare the Sir Galahad with conventional techniques—Table 3.1 shows results produced using the Sir Galahad and the ISO 6978 potassium permanganate absorption method. 

Tasman JE (1959) The permanganate consumption of pulp materials. IV. The kappa correction coefficient. Pulp Pap Mog Can 60(No. C) 231-235 Technical Association of the Pulp and Paper Industry, Atlanta, (1983) Acid-insoluble lignin in wood and pulp. Official Test Method T-222 om-8 Technical Association of the Pulp and Paper Industry, Atlanta, (1985a) Micro kappa number. Useful Method UM 246... 

The AATCC Test Method 102 can also be used to determine the concentration of H O. It is based on the same principle redox mechanism using potassium permanganate. ... 

ASTM D 1363-97. Standard test method for permanganate time of acetone and methanol. 

ISO 757-7-83. Acetone for industrial use - Methods of test - Part 4 Determination of permanganate time. ASTM D 1612-95. Standard test method for acetone in methanol. 

The fermentation-derived food-grade product is sold in 50, 80, and 88% concentrations the other grades are available in 50 and 88% concentrations. The food-grade product meets the Vood Chemicals Codex III and the pharmaceutical grade meets the FCC and the United States Pharmacopoeia XK specifications (7). Other lactic acid derivatives such as salts and esters are also available in weU-estabhshed product specifications. Standard analytical methods such as titration and Hquid chromatography can be used to determine lactic acid, and other gravimetric and specific tests are used to detect impurities for the product specifications. A standard titration method neutralizes the acid with sodium hydroxide and then back-titrates the acid. An older standard quantitative method for determination of lactic acid was based on oxidation by potassium permanganate to acetaldehyde, which is absorbed in sodium bisulfite and titrated iodometricaHy. 

By far the most commonly used oxidation method is the corrected permanganate number test (26) in which the number of mL of 0.1 KMnO consumed by 1 g of oven-dried pulp under specified conditions (kappa number) is deterrnined (TAPPl Historical Method T236 hm-85). Typical kappa numbers for representative pulps are shown in Table 3. 

We have applied to inorganic complex ions a semiempirical method similar to that which has yielded significant results in the case of organic molecules and have chosen to treat permanganate, chromate, and perchlorate ions because the existing data4 seem to afford the greatest number of tests of the correctness of the calculations. 

Mercury Determine as directed under Mercury Limit Test, Appendix IIIB, testing the Sample Preparation prepared as follows Transfer 2.0 mL of the Sample Solution into a 50-mL beaker, add 10 mL of water, 1 mL of 1 5 sulfuric acid, and 1 mL of a 1 25 solution of potassium permanganate, cover the beaker with a watch glass, boil for a few seconds, and cool. Moisture and Residue Determine by ASTM Method E 410-92, Moisture and Residue in Liquid Chlorine. ... 

Lead Determine as directed for Method I in the Atomic Absorption Spectrophotometric Graphite Furnace Method under Lead Limit Test, Appendix IIIB, using a 10-g sample. Methanol Transfer 1 drop of sample to a test tube, add 1 drop of 1 20 phosphoric acid and 1 drop of 1 20 potassium permanganate solution mix and allow to stand for 1 min. Add, dropwise, 1 10 sodium bisulfite solution until the permanganate color disappears. If a brown color remains, add 1 drop of the phosphoric acid solution. Add 5 mL of freshly prepared chromotropic acid TS to the colorless solution, and heat it in a water bath at 60° for 10 min. No violet color appears. 

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