TY - JOUR A1 - Röhl-Kuhn, Barbara A1 - Meyer, Klaus A1 - Klobes, Peter A1 - Fritz, Thomas T1 - Development of porous and dispersed CRM JF - Fresenius' journal of analytical chemistry N2 - Abstract Porous and finely dispersed certified reference materials (CRM) were certified using the gas adsorption method. The special certification procedure for IUPAC isotherm classification types I, II, and IV is presented for meso- and macroporous materials with special emphasis on specific surface area, specific pore volume and pore width according to standards DIN 66 131, 66 134, and 66 135. Four CRMs (SiO2, f-Al2O3, two transition aluminas) with a macro- and mesopore range are presented. Certification was made on the basis of BCR guidelines in connection with interlaboratory tests (altogether 38 participating laboratories, 44 various gas adsorption apparatus). PY - 1998 SN - 0937-0633 VL - 360 IS - 3-4 SP - 393 EP - 397 PB - Springer CY - Berlin AN - OPUS4-11973 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -