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The mass of the sample presented to the laboratory for analysis shall be at least 200 grams.
The sample shall always be kept in an air-tight and moisture-tight container.
All chemicals used shall be of recognized analytical reagent quality except where otherwise specified.
The lists of equipment contain only those items with a specialized use and items to a particular specification.
Analytical balance means a balance capable of weighing to at least 0,1 mg.
The test ieves to be used are to be fitted with a lid, to be of diameter 200 mm, to be constructed of wire cloth with a nominal aperture size of 500 urn. The aperture tolerances and wire diameters to be permitted are as given in ISO 3310/1. (Test sieves — Technical requirements and testing — Part 1: Metal wire cloth. ISO 3310/1 — 1975).
The sieves are to be fitted with a receiver.
For grinding the laboratory sample if necessary (see 1.2.4), without development of undue heat and without loss or absorption of moisture, a hammer mill shall not be used.
The result stated in the analytical report is to be the mean value obtained from two determinations which satisfy the repeatability criterion for that method.
Except where otherwise specified, the result shall be calculated as a percentage by mass of the sample.
The test report shall identify the method of analysis used as well as the results obtained. In addition, it shall mention all details of procedure not specified in the method of analysis or which are optional, as well as any circumstances that may have influenced the results obtained. The test report shall give all the information necessary for the complete identification of the sample.
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