CEN技术报告的这一部分规定了用于定量检测污泥，土壤，土壤改良剂，生长介质和生物量的大肠杆菌的最可能数量（MPN）方法。它允许在测试中进一步区分本标准的第2部分。通过处理和最终产品的质量来评估大肠杆菌的对数减少是合适的。 该方法适用于干燥残余物超过10％的物质。 对于残留物少于10％的材料，应使用CEN/TR 15214-1中给出的程序

This part of the CEN Technical Report specifies a most probable number (MPN) method for the quantitative detection of Escherichia coli in sludges, soils, soil improvers, growing media and biowastes. It allows further differentiation within the test than part 2 of this standard. It is suitable to evaluate the log reduction of E.coli through treatment as well as the quality of the end product. The method is for material with dry residues of more than 10 %. For materials with dry residues less than 10 %, the procedure given in CEN/TR 15214-1 should be used.