Chemie a potravinářství

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 275 (Food analysis - Horizontal methods)
Původce: CEN
K připomínkám do: 2.04.2018
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This International Standard gives requirements and guidance for the organization of proficiency testing schemes for microbiological examinations of:

a)    foods and beverages,

b)   feeding animals,

c)    environmental samples from food and feed production and handling, and

d)   primary production stages.

This International Standard is also applicable to the microbiological examination of water where water is either used in food production or is regarded as a food in national legislation.

This International Standard relates to the technical organization and implementation of proficiency testing schemes, as well as the statistical treatment of results of microbiological examinations.

This International Standard is designed for use with ISO/IEC 17043 and ISO 13528, and deals only with areas where specific or additional details are necessary for proficiency testing schemes dealing with microbiological examinations for the areas specified in the first paragraph.

Komise : CEN/TC 298 (Pigments and extenders)
Původce: CEN
K připomínkám do: 2.04.2018
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This part of ISO 787 specifies a general method of test for determining the electric resistivity (specific electric resistance) or the specific electric conductivity, respectively, of the aqueous extract of a pigment. The method is applicable to all pigments and extenders, except pigments that are substantially soluble in water.

It should be noted that the resistivity of the aqueous extract of a pigment should be considered as a property independent of the amount of water-soluble matter. If agreed, a cold extraction method may be used. This shall be stated in the test report, however.

The temperature of determination should preferably be 23 °C but a different temperature may be agreed between the parties provided that the necessary corrections are made to take account of the differences in temperature.

When this general method is applicable to a given pigment, a cross-reference to it will simply be included in the International Standard relating to that pigment, with a note of any detailed modification which may be needed in view of the special properties of the pigment in question. Only when this general method is not applicable to a particular pigment will a special method for determination of resistivity of aqueous extract be specified.

Komise : CEN/TC 298 (Pigments and extenders)
Původce: CEN
K připomínkám do: 3.04.2018
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This part of ISO 787 specifies a general method of test for determining the pH value of an aqueous suspension of a sample of pigment or extender.

When this general method is applicable to a given pigment or extender, only a cross-reference to it should be included in the International Standard relating to that pigment or extender, with a note of any detailed modification which may be needed in view of the special properties of the material in question. Only when this general method is not applicable to a particular material should a special method for determination of pH value be specified.