ASTM D6919 - 09

    Standard Test Method for Determination of Dissolved Alkali and Alkaline Earth Cations and Ammonium in Water and Wastewater by Ion Chromatography

    Active Standard ASTM D6919 | Developed by Subcommittee: D19.05

    Book of Standards Volume: 11.02


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    ASTM D6919

    Significance and Use

    This method is applicable to the simultaneous determination of dissolved alkali and alkaline earth cations and ammonium in water and wastewaters. Alkali and alkaline earth cations are traditionally determined by using spectroscopic techniques, such as AAS or ICP; whereas ammonium can be measured by using a variety of wet chemical methods, including colorimetry, ammonia-selective electrode, and titrimetry. However, ion chromatography provides a relatively straightforward method for the simultaneous determination of cations, such as lithium, sodium, potassium, calcium, magnesium, and ammonium, in fewer than 2030 min.

    1. Scope

    1.1 This test method is valid for the simultaneous determination of the inorganic alkali and alkaline earth cations, lithium, sodium, potassium, magnesium, and calcium, as well as the ammonium cation in reagent water, drinking water, and wastewaters by suppressed and nonsuppressed ion chromatography.

    1.2 The anticipated range of the method is 0.05200 mg/L. The specific concentration ranges tested for this method for each cation were as follows (measured in mg/L):

    Lithium0.410.0
    Sodium4.040.0
    Ammonium0.410.0
    Potassium1.220.0
    Magnesium2.420.0
    Calcium4.040.0

    1.2.1 The upper limits may be extended by appropriate dilution or by the use of a smaller injection volume. In some cases, using a larger injection loop may extend the lower limits.

    1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.4 It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices.

    1.5 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. For hazards statements specific to this test method, see 8.3.


    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

    D1129 Terminology Relating to Water

    D1193 Specification for Reagent Water

    D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

    D3370 Practices for Sampling Water from Closed Conduits

    D3856 Guide for Management Systems in Laboratories Engaged in Analysis of Water

    D4210 Practice for Intralaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data

    D5810 Guide for Spiking into Aqueous Samples

    D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis

    D5905 Practice for the Preparation of Substitute Wastewater


    ICS Code

    ICS Number Code 71.040.50 (Physicochemical methods of analysis)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D6919-09

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