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 packaged as a 1.5mL concentrate._x000D_ The solvent for this sample is acetone._x000D_ The PT sample is not preserved._x000D_ The sample must be stored at 4ºC._x000D_ Sample Preparation_x000D_ Fill a 1000mL Class A Volumetric Flask with 900mL of organic free reagent water._x000D_ Allow the ampule concentrate to equilibrate to room temperature._x000D_ Open the ampule and pipette exactly 1.0mL 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_ Values of analytes vary lot to lot._x000D_ Proficiency Testing Schedule (2020-2021)_x000D_ Drinking Water_x000D_ WS20-1 January 15 - February 28, 2020_x000D_ WS20-2 March 25 - May 8, 2020_x000D_ WS20-3 July 8 - August 21, 2020_x000D_ WS20-4 September 23 - November 6, 2020_x000D_ WS21-1 January 13 - February 26, 2021_x000D_ WS21-3 July 7 - August 20, 2021_x000D_ Quick-Turn Study - (non-scheduled proficiency test that is available at any time)