Description General description This proficiency testing sample is produced in accordance with ISO/IEC 17043:2010. All information regarding the use of this material can be found in the reporting packet supplied for each sample. Preparation Note The PT sample size provided is 50 g of soil. The soil has been chemically stabilized to minimize degradation of the sample. The PT sample has been sized to 100 mesh. Required storage condition is 4º C. The evaluation of results will be based on study statistics as Required by NELAC. The sample has been intentionally prepared with an apparent headsp Sample Preparation Mix Prior to use. Recommended minimium sampling size is 10 gram. Extract as defined in SW846, Extraction Method 3540B, 3541, 3550A or similar method. Note: Sample extracts and calibration solutions should be in the same solvent. Determine the percent moisture content of the sampe and report results on a dry weight basis. Report all results on a dry weight basis. Analyze the extract using the appropriate method for which you are seeking accreditation. Determine the concentration of the analytes listed, and report your results on the organic analysis data sheet provided. The method used must be reported. If multiple methods are used for preparation and/or analysis, a separate report form must be used for each preparation and analysis method. Other Notes Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes. Values of analytes vary lot to lot. Proficiency Testing Schedule (2020-2021) Soils LPTP20-S1 January 29 - March 13, 2020 LPTP20-S2 April 8 - May 22, 2020 LPTP20-S3 July 22 - September 4, 2020 LPTP20-S4 October 7 - November 20, 2020 LPTP21-S1 January 27 - March 12, 2021 LPTP21-S2 April 7 - May 21, 2021 LPTP21-S3 July 21 - September 3, 2021 LPTP21-S4 October 6 - November 19, 2021 Quick-Turn Study - (non-scheduled proficiency test that is available at any time)