GB/T 13892-2020Surface active agents. Determination of iodine value (English PDF)

1 Scope

This standard specifies the use of Wijs method and near infrared spectroscopy to determine the iodine value of surfactants:

This standard applies to fatty acids, alcohols, amines, animal and vegetable oils and fats with unsaturation, and surfactants made from them:

Iodine value determination:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 601-2016 Preparation of chemical reagent standard titration solution

GB/T 622 Chemical reagent hydrochloric acid

GB/T 651 Chemical reagent potassium iodate

GB/T 1272 Chemical reagent potassium iodide

GB/T 6372 Surface active agent and detergent sample dividing method

GB/T 6682-2008 Analysis laboratory water specifications and test methods

GB/T 29858 General Rules for Quantitative Analysis of Molecular Spectrum Multivariate Calibration

3 Terms and definitions

The following terms and definitions apply to this document:

3:1

Iodine value

Under the operation specified in this standard, the mass of iodine absorbed per 100 grams of sample (grams), (calculated as I2) g/100g:

3:2

Modelingsamples

A series of representative samples used to build the calibration model:

3:3

Validationsamples

A series of representative samples used to verify the calibration model:

3:4

Calibration

The process of correlating the component concentrations or properties of a group of samples with their spectra and establishing a model:

3:5

Calibrationmodel

A mathematical expression that expresses the correlation between the composition and concentration or properties of a set of samples and their spectra:

3:6

Predict

The process of using the calibration model and the spectrum of the sample to calculate the concentration or properties of the sample components: […]