retention index


Also found in: Acronyms.

retention index

[ri′ten·chən ‚in‚deks]
(analytical chemistry)
In gas chromatography, the relationship of retention volume with arbitrarily assigned numbers to the compound being analyzed; used to indicate the volume retention behavior during analysis.
References in periodicals archive ?
A generalization of the retention index system including liner temperature programmed gas-liquid partition chromatography.
Kovats retention indexes of monounsaturated C12, C14, and C16 alcohols, acetates and aldehydes commonly found in Lepidopteran pheromone blends.
In addition, as it is shown in the results section below, this tree presented higher resolution and retention index
Kratz, "A generalization of the retention index system including linear temperature programmed gas-liquid partition chromatography," Journal of Chromatography A, vol.
Compounds were identified by comparison with the reference substances on the basis of the following criteria: retention index (RI) on two stationary phases of different polarities, mass spectra obtained by MS (EI) and MS (CI), and odor quality as well as odor intensity perceived at the sniffing port.
The second and more direct measure of P sorption in Western Australia is the P retention index (PRI) of Allen and Jeffery (1990).
Gas-phase "retention index" data--used in gas chromatography to identify volatile organic compounds--have been added for more than 25,000 different compounds.
Toward that end, some exercises are about instrument characteristics, e.g., determination of spectral band width; effects of temperature on fluorescence; quench correction for tritium counting; response time and leakage current of an oxygen electrode; and determination of the retention index of benzene on an OV-17 column.
The property retention index, in this case, is defined as follows:
Three additional benefits to materials, processing, and design engineers from DMRT are: the ability to define the ceiling-use temperature for functional performance; the property retention index of the construction; and time-temperature superpositioning for long-term prediction of properties.
Compact and full-sized CUV used values were down 1.1% and 4.3% in April 2018 versus 2017, respectively, which outpaced the total market decline of 1.0%, according to Blackbook's Used Vehicle Value Retention Index. Alternatively compact and full-sized cars improved by 3.4% and 2.4%, respectively.