ASTM D7781 - 14 Standard Test Method for Nitrite-Nitrate in Water by Nitrate Reductase

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    D1129 Terminology Relating to Water

    D1141 Practice for the Preparation of Substitute Ocean Water

    D1193 Specification for Reagent Water

    D1254 Method of Test for Nitrite Ion in Water (Withdrawn 1980)

    D3867 Test Methods for Nitrite-Nitrate in Water

    D5810 Guide for Spiking into Aqueous Samples

    D6146 Guide for Monitoring Aqueous Nutrients in Watersheds