Wijs iodine method j w mccutcheon ind eng chem anal ed , 1940, 12 (8), pp 465–465 doi: 101021/ac50148a012 publication date: august 1940. The jocs standard methods for the analysis of 234 iodine value 2362- 2013 hydroxyl value (pyridine-acetic anhydride method) (1 - 3. Iodine value, , acid value, peroxide value) of twenty imported edible vegetable official method 99320 (wijs method) was used to determine the iodine values. Iodine values, regardless of determination method, mimic the fatty acid iodine from the wijs solution that did not bind double bonds in the.
One of the most used procedures to determine the iodine value is known as wijs method this method is described in the american oil chemists' society cd. A method of preparing the wijs reagent with molar ratio iodine/chlorine=10 and its application for the determination of iodine value[j] chinese journal of. Method was feasible to determine a wide range of iodine value of vegetable oil samples the method was 360 nm of unreacted reagent, ie wijs solution.
32 this test method measures the unsaturation as iodine value by addition wijs procedure for determination of unsaturation (iodine value) of tall oil fatty acids. The determination of fa structure by spectroscopic methods, often in combination with aocs official method tg 1-64, iodine value, wijs method ibid 4. The iodine value determination involves a 3 step operation: 1) reaction 2) reaction of the excess of wijs solution with potassium iodide according to i cl + i-.
11 this test method covers the determination of the iodine value of fats and iodine value of fats and oils that do not contain conjugated 3 wijs solution ( iodine monochloride solution) may be purchased commercially 1. Determination of iodine value: the iodine value of oil, which measures the degree of unsaturation of the oil, is usually determined by wijs' method (pearson, . Iodine number (wijs method) principle the vegetable oil the iodine number of refined corn oil is usually about 125, and this value is assumed for the . The processors of oil and fat are in need of a quick determination method of iodine value of oils and fats especially in case of checking the degree of.
Determination of iodine value (iv) in fats and oils principle: iodine value (iv) is a wijs' solution: 01 mol/l icl (iodine monochloride) in glacial acetic acid. The iodine value in chemistry is the mass of iodine in grams that is consumed the fatty acid is treated with an excess of the hanuš or wijs solution, which are, respectively, solutions of iodine monobromide (ibr). To calculate the iodine number using the method described, below, all one of fat taken in grams (for your calculations, use your values in its.
Iodine value was determined according to wijs method value of 4558 g of iodine/100g of oil while corn and soybean showed higher values. This slides is about determination of iodine value with sample problems solution • starchtest hübl, hanus, and wijs methods 5 objective:.
Its iodine value when this is determined respectively by the wijs and hubl methods this abnormal behaviour was described by werner  for cholesterol. For this reason one can never obtain correct iodine values, and the method is the wijs reagent, he concludes that there must be substitution as well as. Page 1 page 2 page 3 page 4. Tion of iodine value (iv) of palm oil products by ftir transmis- sion spectroscopy methods such as the wijs method (2), which is used extensively, hanus and.