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    ASTM D1193-99e1

    Standard Specification for Reagent Water

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    1. Scope

    1.1 This specification covers requirements for water suitable for use in methods of chemical analysis and physical testing. Four grades are specified:

    Type IType IIType IIIType IV
    Electrical conductivity, max, µS/cm at 298 K (25oC)0.0561.00.255.0
    Electrical resistivity, min, Mcm at 298 K (25oC)181.0 4.00.2
    pH at 298 K (25oC)A AA 5.0 to 8.0
    Total organic carbon (TOC), max, µg/L5050200no limit
    Sodium, max, µg/L1510 50
    Chlorides, max, µg/L1510 50
    Total silica, max, µg/L3 3500no limit
    Microbiological contamination-When bacterial levels need to be controlled, reagent grade types should be further classified as follows:
    Type A Type BType C
    Maximum heterotrophic bacteria count10/1000 mL10/100 mL100/10 mL
    Endotoxin, EU/mlB 0.030.25not applicable
    AThe measurement of pH in Type I, II, and III reagent waters has been eliminated from this specification because these grades of water do not contain constituents in sufficient quantity to significantly alter the pH.
    B EU = Endotoxin Units.

    1.2 The method of preparation of the various grades of reagent water determines the limits of impurities and shall be 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 (25oC).

    1.2.2 Type II grade of reagent water shall be prepared by distillation using a still designed to produce a distillate having a conductivity of less than 1.0 µS/cm at 298 K (25oC). Ion exchange, distillation, or reverse osmosis and organic adsorption may be required prior to distillation if the purity cannot be attained by single distillation.

    Note 1—Because distillation is a process commonly relied upon to produce high purity water, the levels specified for Type II reagent water were selected to represent the minimum quality of water that a distillation process should produce.

    1.2.3 Type III grade of reagent water shall be prepared by distillation, ion exchange, continuous electrodeionization reverse osmosis, or a combination thereof, followed by polishing with a 0.45-µm membrane filter.

    1.2.4 Type IV grade of reagent water may be prepared by distillation, ion exchange, continuous electrodeionization reverse osmosis, electrodialysis, or a combination thereof.

    1.3 The choice of one of the various grades may be designated by the method or by the investigator.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1125 Test Methods for Electrical Conductivity and Resistivity of Water

    D1129 Terminology Relating to Water

    D1293 Test Methods for pH of Water

    D4453 Practice for Handling of High Purity Water Samples

    D4517 Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy

    D5128 Test Method for On-Line pH Measurement of Water of Low Conductivity

    D5173 Guide for On-Line Monitoring of Total Organic Carbon in Water by Oxidation and Detection of Resulting Carbon Dioxide

    D5245 Practice for Cleaning Laboratory Glassware, Plasticware, and Equipment Used in Microbiological Analyses

    D5391 Test Method for Electrical Conductivity and Resistivity of a Flowing High Purity Water Sample

    D5542 Test Methods for Trace Anions in High Purity Water by Ion Chromatography

    D5997 Test Method for On-Line Monitoring of Total Carbon, Inorganic Carbon in Water by Ultraviolet, Persulfate Oxidation, and Membrane Conductivity Detection

    D6071 Test Method for Low Level Sodium in High Purity Water by Graphite Furnace Atomic Absorption Spectroscopy

    D6161 Terminology Used for Microfiltration, Ultrafiltration, Nanofiltration and Reverse Osmosis Membrane Processes

    D6529 Test Method for Operating Performance of Continuous Electrodeionization Systems on Feeds from 501000 S/cm

    F1094 Test Methods for Microbiological Monitoring of Water Used for Processing Electron and Microelectronic Devices by Direct Pressure Tap Sampling Valve and by the Presterilized Plastic Bag Method

    ICS Code

    ICS Number Code 71.040.30 (Chemical reagents)

    UNSPSC Code

    UNSPSC Code

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D1193-99E01

    Citation Format

    ASTM D1193-99e1, Standard Specification for Reagent Water, ASTM International, West Conshohocken, PA, 1999, www.astm.org

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