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Standard Specification for Reagent Water

Designation: D 1193 99e1An American National StandardFederal Test MethodStandard No. 7916 Standard Specification forReagent Water1 This Standard is issued under the fixed designation D 1193; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or Standard has been approved for use by agencies of the Department of An editorial change was made in in October This specification covers requirements for Water suitablefor use in methods of chemical analysis and physical grades are specified:Type IType IIType IIIType IVElectrical conductivity,max, S/cm at 298 K(25 C) resistivity, min,MV cm at 298 K (25 C) at 298 K (25 C) to organic carbon(TOC), max, g/L5050200no limitSodium, max, g/L151050 Chlorides, max, g/L151050 Total silica, max, g/L33500no limitMicrobiological contamination When bacterial levels need to be controlled, Reagent grade types should be further classified as follows.

1.2.1 Type I grade of reagent water shall be prepared by distillation or other equal process, followed by polishing with a mixed bed of ion exchange materials and a 0.2-µm membrane filter. Feedwater to the final polishing step must have a maximum conductivity of 20 µS/cm at 298K (25°C). 1.2.2 Type II grade of reagent water shall be prepared by

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