Description_x000D_ General description_x000D_ This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis._x000D_ This product was produced and certified from a naturally contaminated matrix and has not been fortified or modified in any way. Analytical data for Certification was obtained using USEPA SW846, 3rd edition methods 3050 (hot block) and 3051(microwave) using nitric acid extraction. Analysis was carried out according to USEPA methods 6010 (ICP-ES), 6020 (ICP-MS) and 7000 (AES)._x000D_ Specifications_x000D_ View example COA for CRM036_x000D_ Note - The link provided is an example certificate of analysis (COA) only and may not be the lot that you receive. All analytes may not be present or certified for each lot, and analyte concentrations will vary by lot._x000D_ Other Notes_x000D_ Values of analytes vary lot to lot. Some lots may not contain all analytes.