... Service,PB82-258799, Springfield, Virginia 22161, June 1982.3. ASTM Annual Book of Standards, Part 31, D3694-78. “Standard Practices forPreparation of Sample Containers and for Preservation of Organic Constituents,”American ... standards at a minimum of three concentration levels foreach parameter of interest by adding volumes of one or more stock standardsto a volumetric flask. To each calibration standard, add a known ... decomposition. Fill the sample bottles and, if residual chlorine is present,add 80 mg of sodium thiosulfate per liter of sample and mix well. EPA Methods 330.4 and 330.5 may be used for measurement of residual...