# Commission Decision of 12 August 2002 implementing Council Directive 96/23/EC concerning the performance of analytical methods and the interpretation of results (notified under document number C(2002) 3044) (Text with EEA relevance) (2002/657/EC), Division 2.3.4.1: Infra-red detection

Extent: E+W+S+N.I.

Absorption maximum: This shall be in the wavenumber range 4000-500 cm-1.
Intensity of absorption: This shall not be less than either:
(a) a specific molar absorbance of 40 with respect to peak base line; or
(b) a relative absorbance of 12,5 % of the absorbance of the most intense peak in the region 4000-500 cm-1
when both are measured with respect to zero absorbance, and 5 % of the absorbance of the most intense peak in the region 4000-500 cm-1 when both are measured with respect to their peak base line.
Note: Although adequate peaks according to (a) may be preferred from a theoretical point of view, those according to (b) are easier to determine in practice.
The number of peaks in the infrared spectrum of the analyte whose frequencies correspond with an adequate peak in the spectrum of the calibration standard, within a margin of ± 1 cm-1 is determined.

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Source: https://www.legislation.gov.uk/eudn/2002/657/annex/chapter/2.3/division/2.3.4.1 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-657/annex/chapter-2.3/division-2.3.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.