Many of the methods relating to the analysis of inorganic analytes are based on methods referenced in 'Standard Methods for the Examination of Water and Wastewater'. Instrument specific modifications were made to methods as required.
The analysis of Nitrate/nitrite, ammonia, total phosphorus and soluble phosphorus at the ASU use methods designed and tested by the instrument company, SEAL Analytical. These methods are USEPA approved for the analysis of wastewater and drinking water.
Fluoride, chloride, nitrate, nitrite and sulfate are the most common anions tested for in water matrices at the ASU. Ion chromatography instrumentation is used. Extensive method details relating to IC analysis of water samples such as the type of columns used, detectors and gradient profiles/eluents are available in the literature. At the ASU the most common column used is the IonPac AS11. This is also used at the ASU for the analysis of bromide, bromate and phosphate.
At the ASU we use a Dionex ICS3000 ion chromatographic system with autosampler, eluent degas system, computer interface and gradient module. Isocratic and ramp profiles have been developed to analyze for a variety of anions including the ones detailed above.
Follow this link to the Dionex website for the AS11 column specifications and an extensive list of application notes.
Standard methods are also used for the determination of pH and conductivity, COD (chemical oxygen demand) in water and selected anions (using ion specific electrodes).