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.
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| 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 | 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.