Chemie a potravinářství

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 12.06.2019
Zobraz více Zobraz méně
 

This document specifies the lighting and procedure for the visual assessment of degraded areas, spots or other defects on or in coatings.

It is not applicable to the visual comparison of colour, which can be assessed using ISO 3668.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 17.06.2019
Zobraz více Zobraz méně
 

This document is one of a series of standards dealing with the sampling and testing of coating materials and their raw materials.

It specifies a method for the determination of the volatile organic compounds (VOC) content and the semi-volatile organic compounds (SVOC) content of coating materials and their raw materials.

This part is applicable for the determination of VOC and SVOC if the expected VOC and/or SVOC content is greater than 0,01 % by mass up to 100% by mass.

If the VOC content is greater than 15 % by mass, the less complicated method given in ISO 11890‑1 may be used. If the system contains VOC and SVOC, the VOC result of ISO 11890-1 may be influenced by SVOC. In this case ISO 11890-2 shall be preferred. For VOC content smaller than 0,1 %, the head space method described in ISO 17895 can be used as an alternative. ISO 11890-1 and ISO 17895 cannot be used for the determination of the SVOC content.

NOTE 1       Some ingredients of coating materials and their raw materials can decompose during analysis and cause artificial VOC and SVOC signals. When determining VOC and SVOC for coating materials and their raw materials, these signals are artefacts of the method and should not be taken into account (examples are given in Annex B).

This method assumes that the volatile matter is either water or organic. However, other volatile inorganic compounds can be present and might need to be quantified by another suitable method and allowed for in the calculations. The method defined in this standard is not applicable for determination of water content.

NOTE 2       If organic acids or bases and their corresponding salts are present in the coating material or its raw materials, the amount that is quantified by this method may not be accurate due to a change in the acid or base equilibrium.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 18.06.2019
Zobraz více Zobraz méně
 

This method procedure describes a procedure for the determination of inorganic arsenic in animal feeding stuffs by anion-exchange HPLC-ICP-MS following water bath extraction.

This method was successfully tested in the range of 0,149 mg/kg to 9,69 mg/kg in the following animal feed matrices: rice meal, seaweed meal, fish meal, grass meal, complete feed (marine-based), complete feed (cereal based) and a synthetic solution.

NOTE          Mineral feed matrices are not included in the scope of this method as the determination of the total arsenic content is more suitable in such matrices.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 1.07.2019
Zobraz více Zobraz méně
 

This part of ISO 8502 describes a field method for the assessment of the surface density of various water-soluble salts on steel surfaces, before and/or after surface preparation, by conductometric determination. The individual surface densities of the salt composition like chlorides, sulphates, sodium, etc, cannot be determined by this method. This method assesses only contaminants that will form an electrolyte (ions) when in contact with water. These represent the greater part of the contaminants.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 1.07.2019
Zobraz více Zobraz méně
 

This part of ISO 8502 describes a method of extracting, for analysis, water soluble contaminants from a surface by use of flexible cells in the form of adhesive patches or sleeves which can be attached to any surface, regardless of its shape (flat or curved) and its orientation (facing in any direction, including downwards).

The method described is suitable for use in the field to determine the presence of water soluble contaminants before painting or a similar treatment.

This part of ISO 8502 does not cover the subsequent analysis of the contaminants that have been dissolved off. Methods of analysis suitable for field use are described in other parts of ISO 8502.

NOTE          The extraction method might give a false negative or not take all the water-soluble material off the surface because of: (1) Soluble materials hiding in the crevices or under folds of metal; (2) Soluble materials under corrosion layers, passivation layers produced by corrosion inhibitors, oil, grease, or other non-visible thin films.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 1.07.2019
Zobraz více Zobraz méně
 

This part of ISO 8501 specifies a series of preparation grades for steel surfaces after removal/partial removal of water-soluble contaminants, rust, previous paint coatings and other foreign matter by high-pressure water jetting. The various grades are defined by written descriptions together with photographs that are representative examples within the tolerances for each grade as described in words. In addition, this part of ISO 8501 specifies both initial surface conditions and after-cleaning flash rust grades, also defined by written descriptions together with representative photographic examples.

NOTE 1       Examples of foreign matter, other than paint residues, are salt, grime, dirt, mill scale, oil, grease and marine growth, e.g. algae.

This part of ISO 8501 relates the cleanliness of the surface to its visual appearance. In many instances, this is sufficient for the purpose but, for coatings likely to be exposed to severe environments, such as water immersion and continuous condensation conditions, consideration should be given to testing for soluble salts and other invisible contaminants on the visually clean surface by the physical and chemical methods which form the subjects of the various parts of ISO 8502.

The roughness characteristics of the surface should also be considered by reference to ISO 8503, although it must be noted that preparation by high- pressure water jetting does not create a profile or significantly change an existing profile.