Description_x000D_ General description_x000D_ 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._x000D_ Preparation Note_x000D_ Randomly contains a minimum 80% of the analytes listed._x000D_ This PT sample is provided as a concentrate requiring dilution into reagent water._x000D_ The PT sample can be evaluated for each analyte listed on the report form._x000D_ If there are any analytes in the above list you wish not to be evaluated for, leave the associated line blank on the report form._x000D_ This PT sample is packaged as a 1.5 mL concentrate._x000D_ The solvent for this sample is acetone._x000D_ The PT sample is not preserved._x000D_ The sample must be stored at 4 °C._x000D_ Sample preparation_x000D_ Fill a 1000 mL Class A Volumetric Flask with 900 mL of organic free reagent water._x000D_ Allow the ampule concentrate to equilibrate to room temperature._x000D_ Open the ampule and pipet exactly 1.0 mL of the concentrate into the flask_x000D_ Fill to volume and mix well._x000D_ This represents the sample for analysis._x000D_ Report results in ug/L._x000D_ Other Notes_x000D_ Proficiency testing samples are presented as single blind. No values for the samples are released unti the testing period concludes. Values of analytes vary lot to lot._x000D_ Proficiency Testing Schedule (2020-2021)_x000D_ Wastewater_x000D_ WP20-1 January 15 - February 28, 2020_x000D_ WP20-2 March 25 - May 8, 2020_x000D_ WP20-3A May 13 - June 26, 2020_x000D_ WP20-3B July 8 - August 21, 2020_x000D_ WP20-4 September 23 - November 6, 2020_x000D_ WP20-5 November 25 - January 8, 2021_x000D_ WP21-1 January 13 - February 26, 2021_x000D_ WP21-3 July 7 - August 20, 2021_x000D_ Quick-Turn Study - (non-scheduled proficiency test that is available at any time)