EPA Method 9216

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EPA Method 9216:
POTENTIOMETRIC DETERMINATION OF NITRITE IN AQUEOUS SAMPLES WITH ION-SELECTIVE ELECTRODE

Summary:
This method uses a nitrite-selective electrode. All standards and samples are mixed with an equal volume of nitrite interference suppressor solution (NISS). A calibration curve is constructed by recording the nitrite calibration standard readings using an appropriate meter or by manual plotting. Samples are then read in the same manner, and the concentrations reported by the meter or read from the graph.

Scope:
This method can be used for measuring nitrite in drinking water, wastewater, and reagent waters. If this method is used for other types of water samples (i.e., surface water, ground water, etc.), method precision and accuracy must be demonstrated for each matrix type.

Report Number:
SW-846 Ch 5