Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters

Dissolved reactive phosphorus (DRP) was determined as orthophosphate (PO4-P) in fresh and saline water samples by flow-injection (FI) amperometry, without and with in-valve column preconcentration. Detection is based on reduction of the product formed from the reaction of DRP with acidic molybdate a...

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Main Authors: Udnan Y., McKelvie I.D., Grace M.R., Jakmunee J., Grudpan K.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-17744362273&partnerID=40&md5=bf39c62fa28ddcc15be5ec1c04a1a6b3
http://www.ncbi.nlm.nih.gov/pubmed/18970007
http://cmuir.cmu.ac.th/handle/6653943832/4992
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-49922014-08-30T02:56:02Z Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters Udnan Y. McKelvie I.D. Grace M.R. Jakmunee J. Grudpan K. Dissolved reactive phosphorus (DRP) was determined as orthophosphate (PO4-P) in fresh and saline water samples by flow-injection (FI) amperometry, without and with in-valve column preconcentration. Detection is based on reduction of the product formed from the reaction of DRP with acidic molybdate at a glassy carbon working electrode (GCE) at 220 mV versus the Ag/AgCl reference electrode. A 0.1 M potassium chloride solution was used as both supporting electrolyte and eluent in the preconcentration system. For the FI configuration without preconcentration, a detection limit of 3.4 μg P l-1 and sample throughput of 70 samples h-1 were achieved. The relative standard deviations for 50 and 500 μg P l-1 orthophosphate standards were 5.2 and 5.9%, respectively. By incorporating an ion exchange preconcentration column, a detection limit of 0.18 μg P l -1 was obtained for a 2-min preconcentration time (R.S.D.s for 0.1 and 1 μg P l-1 standards were 22 and 1.0%, respectively). Potential interference from silicate, sulfide, organic phosphates and sodium chloride were investigated. Both the systems were applied to the analysis of certified reference materials and water samples. © 2005 Elsevier B.V. All rights reserved. 2014-08-30T02:56:02Z 2014-08-30T02:56:02Z 2005 Article 00399140 10.1016/j.talanta.2004.12.064 18970007 TLNTA http://www.scopus.com/inward/record.url?eid=2-s2.0-17744362273&partnerID=40&md5=bf39c62fa28ddcc15be5ec1c04a1a6b3 http://www.ncbi.nlm.nih.gov/pubmed/18970007 http://cmuir.cmu.ac.th/handle/6653943832/4992 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
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language English
description Dissolved reactive phosphorus (DRP) was determined as orthophosphate (PO4-P) in fresh and saline water samples by flow-injection (FI) amperometry, without and with in-valve column preconcentration. Detection is based on reduction of the product formed from the reaction of DRP with acidic molybdate at a glassy carbon working electrode (GCE) at 220 mV versus the Ag/AgCl reference electrode. A 0.1 M potassium chloride solution was used as both supporting electrolyte and eluent in the preconcentration system. For the FI configuration without preconcentration, a detection limit of 3.4 μg P l-1 and sample throughput of 70 samples h-1 were achieved. The relative standard deviations for 50 and 500 μg P l-1 orthophosphate standards were 5.2 and 5.9%, respectively. By incorporating an ion exchange preconcentration column, a detection limit of 0.18 μg P l -1 was obtained for a 2-min preconcentration time (R.S.D.s for 0.1 and 1 μg P l-1 standards were 22 and 1.0%, respectively). Potential interference from silicate, sulfide, organic phosphates and sodium chloride were investigated. Both the systems were applied to the analysis of certified reference materials and water samples. © 2005 Elsevier B.V. All rights reserved.
format Article
author Udnan Y.
McKelvie I.D.
Grace M.R.
Jakmunee J.
Grudpan K.
spellingShingle Udnan Y.
McKelvie I.D.
Grace M.R.
Jakmunee J.
Grudpan K.
Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
author_facet Udnan Y.
McKelvie I.D.
Grace M.R.
Jakmunee J.
Grudpan K.
author_sort Udnan Y.
title Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
title_short Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
title_full Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
title_fullStr Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
title_full_unstemmed Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
title_sort evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-17744362273&partnerID=40&md5=bf39c62fa28ddcc15be5ec1c04a1a6b3
http://www.ncbi.nlm.nih.gov/pubmed/18970007
http://cmuir.cmu.ac.th/handle/6653943832/4992
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