prEN 13040-2

Scope

This document specifies the general requirements for the preparation of samples, initial suspensions and further dilutions prior to microbiological examinations of soil improvers and growing media. This method is intended especially for sample preparation prior to microbiological examinations of e.g. Escherichia coli (E. coli), Salmonella spp. and enterococci. If a laboratory receives a material/product that is not listed in Annex B but has external characteristics (i.e. hardness, fibrous nature, particle size) like one of the materials/products listed in Annex B, then the procedural steps for sample preparation (pre-treatment, treatment and dilution) are carried out in the same way as listed for the material/product which has comparable external characteristics. Any special diluents or practices required for particular materials or microorganisms in specific standard methods take priority over the general requirements listed in this document.