Method 300.0 Water

Determination of Inorganic Anions by Ion Chromatography


This method is for the determination of the following inorganic anions: bromide, nitrite, chloride, ortho-phosphate-p, fluoride sulfate, nitrate, bromate, chlorite and chlorate.  The matrices applicable for this method are: drinking water, surface water, mixed domestic and industrial wastewaters, groundwater, reagent waters, solids (after extraction), and leachates (when no acetic acid is used).

A small volume of sample, typically 2-3 mL, is analyzed by ion chromatography (IC).  The anions of interest are separated and measured, using a system comprised of a guard column, analytical column, suppressor device, and a conductivity detector.


(EPA: Office of Water)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   28 days from sample collection to analysis for: bromate, bromide, chlorate, chloride, fluoride, and sulfate. 48 hours for nitrate, nitrite, and o-phosphate-p. Chlorite must be analyzed immediately if unpreserved; 14 days if preserved.
Preservatives:   None required for: bromate, bromide, chlorate, chloride, and fluoride. Cool to 4°C for: chlorite, nitrate, nitrite, o-phosphate-p, and sulfate. Add EDA (ethylenediamine) for chlorite.
Required Preps:   Glass or plastic bottle for collection.
Collection Method:   Grab sampling
Analytical Methodology:   IC
Documentation:   300.0

Analyte List*

Analyte Formula CAS Number Detection Limit
Nitrate
NO3
14797-55-8
0.002
 mg/L
Nitrite
NO2-
14797-65-0
0.004
 mg/L
Sulfate
SO4
14808-79-8
0.02
 mg/L
Bromate
BrO3-
15541-45-4
0.02
 mg/L
Chloride
Cl-
16887-00-6
0.02
 mg/L
Fluoride
F-
16984-48-8
0.01
 mg/L
Bromide
Br-
24959-67-9
0.01
 mg/L
Chlorate
HClO3
7790-93-4
0.003
 mg/L
Chlorite
ClO2-
0.01
 mg/L
Orthophosphate
0.003
 mg/L

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.