Schema de intercomparare - ERA PT Solids, WP 241 ERA PT Solids, WP One 500 mL whole-volume bottle is ready to analyze. The CRM is also certified for pH. For a pH PT, order Cat. #577. Total Suspended Solids 20-100 mg/L Total Dissolved Solids at 180°C 140-800 mg/L Total Solids at 105°C 140-800 mg/L WP 319: opens – August 16, closes -September 30; ERA PT Oil & Grease Concentrate, WP 4120 ERA PT Oil & Grease Concentrate, WP One 23 mL screw-cap vial yields up to 2 liters after dilution. n-Hexane Extractable Material(O&G)(Grav) 20-200 mg/L WP 319: opens – August 16, closes -September 30; ERA PT Minerals, WP 581 ERA PT Minerals, WP One 500 mL whole-volume bottle is ready to analyze. Alkalinity as CaCO3 25-400 mg/L Chloride 35-275 mg/L Conductivity at 25°C 200-1200 μmhos/cm Fluoride 0.4-4 mg/L Potassium 4-40 mg/L Sodium 10-100 mg/L Sulfate 5-125 mg/L Total Dissolved Solids at 180°C 140-800 mg/L Total Solids at 105°C 140-800 mg/L WP 319: opens – August 16, closes -September 30; ERA PT pH, WP 577 ERA PT pH, WP One 250 mL whole-volume bottle is ready to analyze. pH 5-10 S.U. WP 319: opens – August 16, closes -September 30; ERA PT Demand, WP 578 ERA PT Demand, WP One 15 mL screw-cap vial yields up to 2 liters after dilution. BOD 18-230 mg/L CBOD 18-230 mg/L COD 30-250 mg/L TOC 6-100 mg/L WP 319: opens – August 16, closes -September 30