Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters

Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters

A flow system with a relocatable detector for spectrophotometric determination of calcium (Ca) and magnesium (Mg) in KCl soil extracts and natural waters is presented. O-Cresolphthalein complexon (CPC) was selected as the chromogenic reagent, ammonium-ammonia as the buffer system, and EGTA or 8-hydr...

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Veröffentlicht in:Journal of agricultural and food chemistry 1996-01, Vol.44 (1), p.165-169
Hauptverfasser: Nogueira, Ana Rita A, Brienza, Sandra M. B, Zagatto, Elias A. G, Lima, José L. F. C, Araújo, Alberto N
Format: Artikel
Sprache:eng
Schlagworte:
AGUA
ANALISIS DEL SUELO
ANALYSE DE SOL
ANALYTICAL METHODS
CALCIO
CALCIUM
CAPTEUR
CATION
CATIONES
CATIONS
CHEMICAL COMPOSITION
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
DETECTORS
EAU
ESPECTROMETRIA
EXTRACTOS
EXTRACTS
EXTRAIT
FLOW SPECTROPHOTOMETRY
MAGNESIO
MAGNESIUM
SENSORES
SENSORS
SOIL TESTING
SPECTROMETRIE
SPECTROMETRY
SPECTROPHOTOMETRY
TECHNIQUE ANALYTIQUE
TECNICAS ANALITICAS
WATER
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Beschreibung
Zusammenfassung:A flow system with a relocatable detector for spectrophotometric determination of calcium (Ca) and magnesium (Mg) in KCl soil extracts and natural waters is presented. O-Cresolphthalein complexon (CPC) was selected as the chromogenic reagent, ammonium-ammonia as the buffer system, and EGTA or 8-hydroxyquinoline as the masking agents for Ca or Mg, respectively. Linearity of the calibration equations was observed for Ca and Mg concentrations up to 80.0 and 15.0 mg/L, respectively. Slight variations in the coefficients of the calibration equations (usually
ISSN:0021-8561
1520-5118
DOI:10.1021/jf950168h