ASTM D6698-07

    Standard Test Method for On-Line Measurement of Turbidity Below 5 NTU in Water


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    1. Scope

    1.1 This test method is applicable to the on-line measurement of turbidity under 5 nephelometric turbidity units (NTU) in water.

    1.2 It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.

    1.3 In this test method calibration standards are defined in NTU values, but other assigned turbidity units are assumed to be equivalent.

    1.4 This method assigns traceable reporting units to the type of respective technology that was used to perform the measurement. Units are numerically equivalent with respect to the calibration standard. For example, a 1 NTU formazin standard is also equal to a 1FNU standard, a 1 FNRU standard and so forth.

    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

    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

    D3864 Guide for On-Line Monitoring Systems for Water Analysis

    D7315 Test Method for Determination of Turbidity Above 1 Turbidity Unit (TU) in Static Mode


    ICS Code

    ICS Number Code 13.060.60 (Examination of water for physical properties)

    UNSPSC Code

    UNSPSC Code 41113026(Nephelometers)


    Referencing This Standard
    Link Here
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    DOI: 10.1520/D6698-07

    Citation Format

    ASTM D6698-07, Standard Test Method for On-Line Measurement of Turbidity Below 5 NTU in Water, ASTM International, West Conshohocken, PA, 2007, www.astm.org

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