1. USEPA Method 300.7 (1986) ‘Dissolved sodium, ammonium, potassium, magnesium, and calcium in wet deposition by chemically suppressed ion chromatography’. USEPA, Cincinnati, OH
2. ASTM D6910-03 and D6919, ‘Standard test method for determination of dissolved alkali and alkaline earth cations and ammonium in water and wastewater by ion chromatography’
3. Jackson PE (2001) Trends Anal Chem 20:320–329
4. Singh RP, Abbas NM (1996) J Chromatogr A 733:93–99
5. Marini M, Campanelli A, Abballe F (2006) Mar Chem 99:24–30