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 |
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| container_title | Journal of agricultural and food chemistry |
| container_volume | 44 |
| creator | Nogueira, Ana Rita A Brienza, Sandra M. B Zagatto, Elias A. G Lima, José L. F. C Araújo, Alberto N |
| description | 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 |
| doi_str_mv | 10.1021/jf950168h |
| format | Article |
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B ; Zagatto, Elias A. G ; Lima, José L. F. C ; Araújo, Alberto N</creator><creatorcontrib>Nogueira, Ana Rita A ; Brienza, Sandra M. B ; Zagatto, Elias A. G ; Lima, José L. F. C ; Araújo, Alberto N</creatorcontrib><description>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 <3%) were found after 4-h working periods. Recoveries between 97.5 and 104.1% were calculated after adding 10.0 mL of Ca at 15.00 mg/L or Mg at 5.00 mg/L Mg to 50.0-mL sample solutions. Precise results (relative standard deviation, <0.02) in agreement with flame atomic absorption spectrometry were obtained. With multisite detection, washing time was not a relevant factor in sampling rate, and an improved sample throughput of ∼160/h (corresponding to 0.8 mg of CPC per sample) was obtained. 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B</creatorcontrib><creatorcontrib>Zagatto, Elias A. G</creatorcontrib><creatorcontrib>Lima, José L. F. C</creatorcontrib><creatorcontrib>Araújo, Alberto N</creatorcontrib><title>Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters</title><title>Journal of agricultural and food chemistry</title><addtitle>J. Agric. Food Chem</addtitle><description>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 <3%) were found after 4-h working periods. Recoveries between 97.5 and 104.1% were calculated after adding 10.0 mL of Ca at 15.00 mg/L or Mg at 5.00 mg/L Mg to 50.0-mL sample solutions. Precise results (relative standard deviation, <0.02) in agreement with flame atomic absorption spectrometry were obtained. With multisite detection, washing time was not a relevant factor in sampling rate, and an improved sample throughput of ∼160/h (corresponding to 0.8 mg of CPC per sample) was obtained. Keywords: Multisite detection; flow spectrophotometry; calcium; magnesium; soil and water analysis</description><subject>AGUA</subject><subject>ANALISIS DEL SUELO</subject><subject>ANALYSE DE SOL</subject><subject>ANALYTICAL METHODS</subject><subject>CALCIO</subject><subject>CALCIUM</subject><subject>CAPTEUR</subject><subject>CATION</subject><subject>CATIONES</subject><subject>CATIONS</subject><subject>CHEMICAL COMPOSITION</subject><subject>COMPOSICION QUIMICA</subject><subject>COMPOSITION CHIMIQUE</subject><subject>DETECTORS</subject><subject>EAU</subject><subject>ESPECTROMETRIA</subject><subject>EXTRACTOS</subject><subject>EXTRACTS</subject><subject>EXTRAIT</subject><subject>FLOW SPECTROPHOTOMETRY</subject><subject>MAGNESIO</subject><subject>MAGNESIUM</subject><subject>SENSORES</subject><subject>SENSORS</subject><subject>SOIL TESTING</subject><subject>SPECTROMETRIE</subject><subject>SPECTROMETRY</subject><subject>SPECTROPHOTOMETRY</subject><subject>TECHNIQUE ANALYTIQUE</subject><subject>TECNICAS ANALITICAS</subject><subject>WATER</subject><issn>0021-8561</issn><issn>1520-5118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNptkMtOwzAQRS0EEqWw4AOQvGHBImAncewsobwqlWdbsbSmrkNdkriyXZX-BZ-MaRErVqPRObqjuQgdU3JOSUov5lXJCC3EbAd1KEtJwigVu6hDIkwEK-g-OvB-TggRjJMO-rqt7Qr327lWwdgWD9c-6AavTJjhh2UdjDdB42sdfnllHR4u4uLsYmaDbXRwRm0E15gWNpKtcA9qZZYNhnaKH-C91f5nM_GANTW--QwOVPAb_Ahh6aDGbxAz_CHaq6D2-uh3dtH49mbUu08GT3f93uUggYzykHCVpROY5FqlQosUymIiCJAplBXnucorkkHJBFNiKlKe50prxSYk5yzLOaFZ1kVn21zlrPdOV3LhTANuLSmRP1XKvyqjm2xdE8v5_BPBfciCZ5zJ0fNQ8peidzVKX-VV9E-2fgVWwrszXo6HtCw5YRnnZeSnWw7Ky7ldujZ--s_dbym1jW4</recordid><startdate>19960101</startdate><enddate>19960101</enddate><creator>Nogueira, Ana Rita A</creator><creator>Brienza, Sandra M. B</creator><creator>Zagatto, Elias A. G</creator><creator>Lima, José L. F. C</creator><creator>Araújo, Alberto N</creator><general>American Chemical Society</general><scope>FBQ</scope><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19960101</creationdate><title>Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters</title><author>Nogueira, Ana Rita A ; Brienza, Sandra M. B ; Zagatto, Elias A. G ; Lima, José L. F. C ; Araújo, Alberto N</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a317t-7c32bab4ec28e82a96b80a0da9f774c4f03a9585c8d82744ceec5b04753470133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>AGUA</topic><topic>ANALISIS DEL SUELO</topic><topic>ANALYSE DE SOL</topic><topic>ANALYTICAL METHODS</topic><topic>CALCIO</topic><topic>CALCIUM</topic><topic>CAPTEUR</topic><topic>CATION</topic><topic>CATIONES</topic><topic>CATIONS</topic><topic>CHEMICAL COMPOSITION</topic><topic>COMPOSICION QUIMICA</topic><topic>COMPOSITION CHIMIQUE</topic><topic>DETECTORS</topic><topic>EAU</topic><topic>ESPECTROMETRIA</topic><topic>EXTRACTOS</topic><topic>EXTRACTS</topic><topic>EXTRAIT</topic><topic>FLOW SPECTROPHOTOMETRY</topic><topic>MAGNESIO</topic><topic>MAGNESIUM</topic><topic>SENSORES</topic><topic>SENSORS</topic><topic>SOIL TESTING</topic><topic>SPECTROMETRIE</topic><topic>SPECTROMETRY</topic><topic>SPECTROPHOTOMETRY</topic><topic>TECHNIQUE ANALYTIQUE</topic><topic>TECNICAS ANALITICAS</topic><topic>WATER</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nogueira, Ana Rita A</creatorcontrib><creatorcontrib>Brienza, Sandra M. B</creatorcontrib><creatorcontrib>Zagatto, Elias A. G</creatorcontrib><creatorcontrib>Lima, José L. F. C</creatorcontrib><creatorcontrib>Araújo, Alberto N</creatorcontrib><collection>AGRIS</collection><collection>Istex</collection><collection>CrossRef</collection><jtitle>Journal of agricultural and food chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nogueira, Ana Rita A</au><au>Brienza, Sandra M. B</au><au>Zagatto, Elias A. G</au><au>Lima, José L. F. C</au><au>Araújo, Alberto N</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters</atitle><jtitle>Journal of agricultural and food chemistry</jtitle><addtitle>J. Agric. Food Chem</addtitle><date>1996-01-01</date><risdate>1996</risdate><volume>44</volume><issue>1</issue><spage>165</spage><epage>169</epage><pages>165-169</pages><issn>0021-8561</issn><eissn>1520-5118</eissn><abstract>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 <3%) were found after 4-h working periods. Recoveries between 97.5 and 104.1% were calculated after adding 10.0 mL of Ca at 15.00 mg/L or Mg at 5.00 mg/L Mg to 50.0-mL sample solutions. Precise results (relative standard deviation, <0.02) in agreement with flame atomic absorption spectrometry were obtained. With multisite detection, washing time was not a relevant factor in sampling rate, and an improved sample throughput of ∼160/h (corresponding to 0.8 mg of CPC per sample) was obtained. Keywords: Multisite detection; flow spectrophotometry; calcium; magnesium; soil and water analysis</abstract><pub>American Chemical Society</pub><doi>10.1021/jf950168h</doi><tpages>5</tpages></addata></record> |
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| ispartof | Journal of agricultural and food chemistry, 1996-01, Vol.44 (1), p.165-169 |
| issn | 0021-8561 1520-5118 |
| language | eng |
| recordid | cdi_crossref_primary_10_1021_jf950168h |
| source | ACS_美国化学学会期刊（与NSTL共建） |
| subjects | 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 |
| title | Flow Injection System with Multisite Detection for Spectrophotometric Determination of Calcium and Magnesium in Soil Extracts and Natural Waters |
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