BS EN ISO 8974:2002 pdf free.Plastics – Phenolic resins – Determination of residual phenol content by gas chromatography.
BS EN ISO 8974 specifies two methods, using gas chromatography, of measuring the residual phenol content of phenolic resins.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 1042:1998, Laboratory glassware — One-mark volumetric flasks
ISO 6353-2:1983, Reagents for chemical analysis — Part 2: SpecifIcations — First series
ISO 10082:1999, Plastics — Phenolic resins — Classification and test methods
3 Principle
A test portion is dissolved in a suitable solvent and the phenol content determined by gas chromatography.
4 Terms and definitions
For the purposes of this International Standard, the terms and definitions contained in ISO 10082 and the following terms and definitions apply.
4.1 internal standard
reference material added in known quantity to the test solution to determine the response factor for the phenol
4.2 mass ratio
ratio of the mass of the phenol to the mass of an internal standard in the test solution
4.3 peak area ratio
ratio of the phenol peak area to the internal-standard peak area
5 Reagents and materials
During the analysis, use only reagents of recognized analytical grade (as listed in Iso 6353-2) except where otherwise stated,
5.1 Carrier gas: hydrogen. nitrogen or helium, chromatographic grade.
NOTE For safety reasons, the use of helium or nitrogen is recommended.
5.2 Detector gas: hydrogen and compressed air.
5.3 Internal standard: any product which is not usually a constituent of phenolic resins and which meets the following requirements:
is chemically pure:
has good long-term stability;
is chemically inert to phenolic resins under the test conditions; does not interfere with any of the constituents of the sample; gives a linear response within the range of concentrations to be measured;
preferably has a retention time close to that of the phenol and gives a Gaussian peak. Examples of reagents which meet the above-mentioned requirements are:
1-octanol (especially recommended):
1 -undecanol.
5.4 Solvent: any product which will completely dissolve the internal standard and the test portion of phenolic resin to give a stable solution, and which meets the following requirements:
is inert (does not react with the resin or the internal standard under the test conditions);
is compatible with the constituents of the chromatographic column;
has a retention time different from those of the phenol and the internal standard.BS EN ISO 8974 pdf free download.
Tags: Plastics
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