Method 300.1

Determination of Inorganic Anions in Drinking Water by Ion Chromatography


This method is for the determination of inorganic anions in reagent water, surface water, ground water, and finished dirnking water.  Common anions listed as appropriate for the method are bromide, chloride, fluoride, nitrate, nitrite, ortho-phosphate-p, and sulfate.  Inorganic disinfection by-products listed as appropriate for the method are bromate, bromide, chlorite, and chlorate.

A small volume of sample, 10 - 50 μL is analyzed by ion chromatography (IC) with a conductivity detector.  The method is identifcal for both sets of anions and differs only by the amount of sample injected.

Ortho-phosphate degrades when held at room temperature for more than 16 hours.  The method specifies that samples cannot be held at room temperature for more than 12 cumulative hour if analyzed for ortho-phosphate.


(EPA)

Request-A-Quote

No Obligation Quotation for Analytical Services

If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we'll provide you a quote via email. As you are searching or browsing our Analytical Guide, you'll see the Request-A-Quote icon... just click on it to start the request process.
Request-A-Quote

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: bromide, chloride, and fluoride. Cool to 4°C for: chlorite, nitrate, nitrite, o-phosphate-p, and sulfate. Add EDA (ethylenediamine) for chlorite, bromate, and chlorate.
Required Preps:   250mL Glass or plastic bottle with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   IC
Documentation:  
300.1

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
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
Chlorite
ClO2-
0.01
 mg/L
Orthophosphate
0.003
 mg/L
Bromite
Bromite
0.02
 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.