Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection

Detalhes bibliográficos
Autor(a) principal: Shi,Wenhui
Data de Publicação: 2014
Outros Autores: Yang,Lin, Fu,Quanjun, Zhang,Zhiye, Wang,Xinlong
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000800016
Resumo: An improved method based on reverse flow injection is proposed for determining sulfate concentration in the wet-process of phosphoric acid (WPA). The effect of reagent composition, flow rate, temperature, acid concentration, length of the reaction coil, and linear response range on the flow system is discussed in detail. Optimal conditions are established for determining sulfate in the WPA samples. Baseline drift is avoided by a periodic washing step with EDTA in an alkaline medium. A linear response is observed within a range of 20 - 360 mg L-1, given by the equation A = 0.0020C (mg L-1) + 0.0300, R² = 0.9991. The detection limit of the proposed method for sulfate analysis is 3 mg L-1, and the relative standard deviation (n = 12) of sulfate absorbance peak is less than 1.60%. This method has a rate of up to 29 samples per hour, and the results compare well with those obtained with gravimetric method.
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spelling Determination of sulfate in the wet-process of phosphoric acid by reverse flow injectionreverse flow injectionsulfateturbidimetryAn improved method based on reverse flow injection is proposed for determining sulfate concentration in the wet-process of phosphoric acid (WPA). The effect of reagent composition, flow rate, temperature, acid concentration, length of the reaction coil, and linear response range on the flow system is discussed in detail. Optimal conditions are established for determining sulfate in the WPA samples. Baseline drift is avoided by a periodic washing step with EDTA in an alkaline medium. A linear response is observed within a range of 20 - 360 mg L-1, given by the equation A = 0.0020C (mg L-1) + 0.0300, R² = 0.9991. The detection limit of the proposed method for sulfate analysis is 3 mg L-1, and the relative standard deviation (n = 12) of sulfate absorbance peak is less than 1.60%. This method has a rate of up to 29 samples per hour, and the results compare well with those obtained with gravimetric method.Sociedade Brasileira de Química2014-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000800016Química Nova v.37 n.8 2014reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0100-4042.20140196info:eu-repo/semantics/openAccessShi,WenhuiYang,LinFu,QuanjunZhang,ZhiyeWang,Xinlongeng2019-06-28T00:00:00Zoai:scielo:S0100-40422014000800016Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2019-06-28T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
title Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
spellingShingle Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
Shi,Wenhui
reverse flow injection
sulfate
turbidimetry
title_short Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
title_full Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
title_fullStr Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
title_full_unstemmed Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
title_sort Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
author Shi,Wenhui
author_facet Shi,Wenhui
Yang,Lin
Fu,Quanjun
Zhang,Zhiye
Wang,Xinlong
author_role author
author2 Yang,Lin
Fu,Quanjun
Zhang,Zhiye
Wang,Xinlong
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Shi,Wenhui
Yang,Lin
Fu,Quanjun
Zhang,Zhiye
Wang,Xinlong
dc.subject.por.fl_str_mv reverse flow injection
sulfate
turbidimetry
topic reverse flow injection
sulfate
turbidimetry
description An improved method based on reverse flow injection is proposed for determining sulfate concentration in the wet-process of phosphoric acid (WPA). The effect of reagent composition, flow rate, temperature, acid concentration, length of the reaction coil, and linear response range on the flow system is discussed in detail. Optimal conditions are established for determining sulfate in the WPA samples. Baseline drift is avoided by a periodic washing step with EDTA in an alkaline medium. A linear response is observed within a range of 20 - 360 mg L-1, given by the equation A = 0.0020C (mg L-1) + 0.0300, R² = 0.9991. The detection limit of the proposed method for sulfate analysis is 3 mg L-1, and the relative standard deviation (n = 12) of sulfate absorbance peak is less than 1.60%. This method has a rate of up to 29 samples per hour, and the results compare well with those obtained with gravimetric method.
publishDate 2014
dc.date.none.fl_str_mv 2014-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000800016
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000800016
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.5935/0100-4042.20140196
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.37 n.8 2014
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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