TY - JOUR A1 - Scharf, Holger A1 - Bremser, Wolfram T1 - Certification of a reference material for determination of total cyanide in soil to support implementation of the international standard ISO 11262:2011 JF - Analytical and bioanalytical chemistry N2 - Cyanides are among the most important inorganic pollutants to be tested and monitored in environmental compartments. They can be distinguished and determined as free cyanide, weak acid dissociable cyanide or as total cyanide. However, in any case obtained, measurement results are operationally defined referring to the applied analytical method. In 2011, the International Standard ISO 11262 has been published which specifies a normative analytical method for the determination of total cyanide in soil. The objective of the project described in this paper was to provide the first soil reference material (CRM) certified for its mass fraction of total cyanide on the basis of this standard. A total of 12 German laboratories with proven experience in the determination of cyanides in environmental samples participated in the certification study. Measurement results were evaluated in full compliance with the requirements of ISO Guide 35. Taking into account the results of the inter-laboratory comparison as well as the outcome of the homogeneity and stability studies, a certified mass fraction of total cyanide of 21.1 mg/kg and an expanded uncertainty (k=2) of 1.3 mg/kg were assigned to the material. The reference material has been issued as CRM BAM-U114. KW - Certified reference material KW - Total cyanide KW - Soil KW - Quality assurance KW - International standard PY - 2015 DO - https://doi.org/10.1007/s00216-014-8149-1 SN - 1618-2642 SN - 1618-2650 VL - 407 IS - 11 SP - 3219 EP - 3223 PB - Springer CY - Berlin AN - OPUS4-33023 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -