DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN

An optimized spectroscopic methodology for the quantification of urea using p-dimethylaminobenzaldehyde (DMAB) as a derivatizing reagent is proposed to avoid changes in reproducibility caused by aging of acidic DMAB solutions, and the unintended use of different solvents. Four solvents; ethanol, met...

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Autores principales:	GIRALDO,JUAN D, RIVAS,BERNABÉ L
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2017
Materias:	Solvent effect Schiff bases UV/Vis Spectroscopy Chitosan Controlled release fertilizers
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200023
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spelling	oai:scielo:S0717-970720170002000232017-06-30DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSANGIRALDO,JUAN DRIVAS,BERNABÉ L Solvent effect Schiff bases UV/Vis Spectroscopy Chitosan Controlled release fertilizers An optimized spectroscopic methodology for the quantification of urea using p-dimethylaminobenzaldehyde (DMAB) as a derivatizing reagent is proposed to avoid changes in reproducibility caused by aging of acidic DMAB solutions, and the unintended use of different solvents. Four solvents; ethanol, methanol, 2-propanol and acetonitrile are evaluated. Acetonitrile has never been reported for the determination of urea with DMAB, and it is found to be the best medium for the quantification of urea due to its aprotic nature. The use of acetonitrile allows a more stable reaction system, which results in a faster urea quantification, less acid consumption and a more sensitive spectroscopic method. Taking into account that polymer matrices of chitosan are being used recently to develop controlled release fertilizers of urea, a complementary study is carried out to determine any interference by released chitosan macromolecules with different molecular mass and degree of deacetylation in the optimized system. The results show no appreciable changes in the sensitivity and accuracy of the methodology being other available application of this work.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.62 n.2 20172017-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200023en10.4067/S0717-97072017000200023
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Solvent effect Schiff bases UV/Vis Spectroscopy Chitosan Controlled release fertilizers
spellingShingle	Solvent effect Schiff bases UV/Vis Spectroscopy Chitosan Controlled release fertilizers GIRALDO,JUAN D RIVAS,BERNABÉ L DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
description	An optimized spectroscopic methodology for the quantification of urea using p-dimethylaminobenzaldehyde (DMAB) as a derivatizing reagent is proposed to avoid changes in reproducibility caused by aging of acidic DMAB solutions, and the unintended use of different solvents. Four solvents; ethanol, methanol, 2-propanol and acetonitrile are evaluated. Acetonitrile has never been reported for the determination of urea with DMAB, and it is found to be the best medium for the quantification of urea due to its aprotic nature. The use of acetonitrile allows a more stable reaction system, which results in a faster urea quantification, less acid consumption and a more sensitive spectroscopic method. Taking into account that polymer matrices of chitosan are being used recently to develop controlled release fertilizers of urea, a complementary study is carried out to determine any interference by released chitosan macromolecules with different molecular mass and degree of deacetylation in the optimized system. The results show no appreciable changes in the sensitivity and accuracy of the methodology being other available application of this work.
author	GIRALDO,JUAN D RIVAS,BERNABÉ L
author_facet	GIRALDO,JUAN D RIVAS,BERNABÉ L
author_sort	GIRALDO,JUAN D
title	DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
title_short	DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
title_full	DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
title_fullStr	DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
title_full_unstemmed	DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN
title_sort	determination of urea using p -n,n-dimethylaminobenzaldehyde: solvent effect and interference of chitosan
publisher	Sociedad Chilena de Química
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200023
work_keys_str_mv	AT giraldojuand determinationofureausingpnndimethylaminobenzaldehydesolventeffectandinterferenceofchitosan AT rivasbernabel determinationofureausingpnndimethylaminobenzaldehydesolventeffectandinterferenceofchitosan
_version_	1714200912828825600

DETERMINATION OF UREA USING p -N,N-DIMETHYLAMINOBENZALDEHYDE: SOLVENT EFFECT AND INTERFERENCE OF CHITOSAN

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