Iodine Number


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iodine number

[′ī·ə‚dīn ‚nəm·bər]
(analytical chemistry)
A measure of the iodine absorbed in a given time by a chemically unsaturated material, such as a vegetable oil or a rubber; used to measure the unsaturation of a compound or mixture. Also known as iodine value.

Iodine Number

 

the mass of iodine (in grams) joined to 100 g of organic substance. The iodine number, which describes the double-bond content in an unsaturated compound, is determined during the study of fats and the analysis of fatty acids and the establishment of the content of admixtures that react with iodine in aromatic hydrocarbons. In certain cases, to determine the iodine number the mass of bromine, which combines more readily, is established, and the equivalent mass of iodine is then calculated.

References in periodicals archive ?
Iodine number tests, shown in Table 1, have shown a decrease in the number of double-bonds due to the radical reaction.
Basically, iodine number is a measure of the iodine adsorbed in the pores and, as such, is an indication of the pore volume available in the activated carbon of interest.
The procedure used is an adaptation of the ASTM method D4607-86 [20], a standard iodine solution was treated with several weights of activated sample depending on the iodine number under specified conditions.
In addition oil densities and iodine numbers are shown as a rough measure of quality of oils.
The CTAB Surface Area test was designed to overcome both the problems mentioned for the iodine number and nitrogen surface area tests; in that the molecule to be adsorbed, cetyltrimethylammonium bromide, is far larger than the nitrogen molecule and is also a very effective wetting agent.
One way of understanding is to subtract the iodine number from the nitrogen surface area.
Studies have shown that the strength of carbon black pellets of comparable size rises with increasing carbon black surface area (iodine number) and with decreasing aggregate structure (DBPA) (ref.
3.80(*) .034 0.9 2.45 .025 1.0 Lab 4 Refractive index 4.7 .03 0.6 2.4 .07 2.9 Lab 5 Iodine number 4.8 .13 2.7 2.45 .08 3.3 Sample 3 x s v Lab 1 Refractive index 9.10 .126 1.4 Lab 2 Infrared spectr.
The constant strain energy absorption (G' tan [delta]) accordingly is proportional to DBPA x iodine number (figure 34); and the constant stress energy absorption (tan [delta]/G') is proportional to iodine number/DBPA (figure 35).
[S.sub.T] can be calculated from equation 5 using nitrogen surface area, or any of the commonly used surface area measurements such as CTAB or iodine number. The values for the interaction parameters, I, can be determined from the ASTM SBR formulation (D 3191).
* Low iodine numbers indicate a fat with a high degree of saturation.