Ion Chromatography as an Alternative to Standard Methods for Analysis of Macro-nutrients in Mehlich 1 Extracts of Unfertilized Forest Soils

Abstract

This study evaluates ion chromatography (IC) as an alternative to atomic absorption (AA) and inductively-coupled plasma spectrometry (ICP) for analysis of potassium (K), magnesium (Mg), and calcium (Ca), and as an alternative to antimonylmolybdate colorimetry and ICP for analysis of phosphorus (P) macro-nutrients ORDER REPRINTS in Mehlich 1 extracts. Soils typical of pine forests in the southeastern United States were tested. IC correlates well with AA and ICP for K and Ca, but not for Mg, unless conditions are chosen that resolve Mg from manganese (Mn). IC does not correlate very well with colorimetry for P at extract levels below 2 mg kg À1 or in extracts with high levels of dissolved organic matter complexes of aluminum (Al) and iron (Fe). ICP results for P exceed both IC and colorimetry by 3-5 mg kg À1 for all soils tested. The merits of IC relative to AA, ICP, and colorimetry for forest soil testing are discussed.

Immobilization of β-CD on a Hyper-Crosslinked Polymer for the Enhanced Removal of Amines from Aqueous Solutions

“…As described in a previously reported study [ 25 ], an ion chromatographic method was used to determine the chlorine content in the polymers. pH values were obtained by using a PHS-3C pH meter (Inesa, Beijing, China).…”

Comparação de métodos convencional e alternativo para determinação de sódio, potássio e fósforo em extratos de solos obtidos com solução de mehlich-1

“…na determinação de na e K é utilizada chama de ar/ acetileno, que pode atingir temperaturas da ordem de 2.450 K (lajunen, 1992). a determinação de elementos por iCp oes é um método alternativo que apresenta muitas vantagens: determinação simultânea, detecção em ampla faixa de concentração, alta precisão, exatidão, sensibilidade e rapidez (raij et al, 2001;nolte, 2003;Fischer & miller, 2004;pittman et al, 2005;milagres et al, 2007;Bortolon & Gianello, 2008;Bortolon & Gianello, 2010, soares et al 2010. no iCp oes, a fonte de excitação é o plasma, que pode atingir temperaturas muito maiores (10.000 K) (lajunem, 1991) que a fotometria de chama; consequentemente, a eficiência na excitação de átomos e íons por iCp oes é muito maior (Bortolon & Gianello, 2010).…”