ISO 4874-2020 pdf download

ISO 4874-2020 pdf download.Tobacco – Sampling of batches of raw material一General principles. 4 Contractual arrangements The contract between the interested parties shalt state a) at what stages of production and delivery sampling shall 1w carried out; b) the party or parties responsible for carrying out the sampling and under whue control; c) the characteristics to be determined; d) the laboratory or laboratories that will perform the analyses. e) the maximum interval of time admissible between sampling and analysis. (This interval should be as short as possible.) S Sampling 5.1 General It is important that the laboratory receive a reprewnt.it lye sample which has not been damaged or changed during transport or storage. If it is necessary to sample tobacco taken from cigarettes, the procedures listed in ISO 8243:2013, 4.1.3 should be used. 5.2 Sampling equipment The equipment that is used for sampling the tobacco shall be appropriate for the determination of the characteristics that are specified In GLiuse4 C). If physical characteristics such as leaf dimensions or particle size distribution are to Lw determined, then the sampling equipment shall not alter these characteristics. The sampling equipmt’in shall be dean and dry, and shall not affect any subsequent determination. 5.3 ContaIners for samples and storage precautions The containers used for collecting the samples shall be made of a chemically inert material. They shall be airtight and preferably opaque. The samples shall be kept in a dry and cool place protected against light, and In an odour-free environment to prevent contamination, microbial growth, inlestatmn or other situations which would affect organoleptic properts. 6 Procedure 6.1 General The procedure shall Include the following steps: a) labelling of samples far proper identification; b) selection of sampling units; c) extraction of increments and constitution of single samples; d) constitution of the gross sample; e) constitution of reduced samples; 1) preparation of the laboratory sample(s). If heterogeneity is of interest as well as mean values, analyses of several laboratory samples is necessary. In these circumstances, the laboratory samples is usually taken from a single sample or a gross sample comprising not more than two or three single samples. 6.2 Treatment of damaged sampling units The treatment of damaged sampling units depends on the aim of the analyses. a) lithe damage to the tobacco is irrelevant with respect to the characteristics to be determined (for example, disease markings when assessing the length of the leaf], sample damaged...