Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS

A method for determining low levels of As and Cd by dispersive liquid-liquid microextraction (DLLME) and inductively coupled plasma mass spectrometry (ICP-MS) was proposed. The following parameters that affect extraction efficiency were investigated: type and volume of extraction solvent (1000 µL acetone), type and volume of dispersive solvent (75 µL carbon tetrachloride), amount of ammonium pyrrolidinedithiocarbamate and sodium diethyldithiocarbamate as chelating agents, sample mass (0.5 g in 10 mL ultrapure water), pH of sample solution (2.0) and number of washing steps (one). Accuracy was evaluated by analytes determination in sugar samples by ICP-MS after digestion by microwave-induced combustion (MIC). No significant difference was observed between results of the proposed DLLME method and MIC in the case of both analytes. Instrument calibration was performed by the standard addition method and good linearity was achieved. Limits of quantification (LOQs) were 0.7 and 0.2 ng g-1 for As and Cd, respectively. The main advantages of this method are relatively high sample mass, low dilution, suitable preconcentration factors and significantly low LOQs (ng g-1 range). When the proposed method was used for determining As and Cd in four sugar samples, their concentrations ranged from 1.13 to 2.95 ng g-1 and from 0.31 to 0.43 ng g-1, respectively.

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Main Authors: Seeger,Tassia S., Vecchia,Paula Dalla, Machado,Eduarda Q., Reinke,Karine, Mesko,Marcia F., Duarte,Fabio A.
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Química 2017
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901691
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spelling oai:scielo:S0103-505320170009016912017-07-28Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MSSeeger,Tassia S.Vecchia,Paula DallaMachado,Eduarda Q.Reinke,KarineMesko,Marcia F.Duarte,Fabio A. dispersive liquid-liquid microextraction sugar arsenic cadmium inductively coupled plasma mass spectrometry A method for determining low levels of As and Cd by dispersive liquid-liquid microextraction (DLLME) and inductively coupled plasma mass spectrometry (ICP-MS) was proposed. The following parameters that affect extraction efficiency were investigated: type and volume of extraction solvent (1000 µL acetone), type and volume of dispersive solvent (75 µL carbon tetrachloride), amount of ammonium pyrrolidinedithiocarbamate and sodium diethyldithiocarbamate as chelating agents, sample mass (0.5 g in 10 mL ultrapure water), pH of sample solution (2.0) and number of washing steps (one). Accuracy was evaluated by analytes determination in sugar samples by ICP-MS after digestion by microwave-induced combustion (MIC). No significant difference was observed between results of the proposed DLLME method and MIC in the case of both analytes. Instrument calibration was performed by the standard addition method and good linearity was achieved. Limits of quantification (LOQs) were 0.7 and 0.2 ng g-1 for As and Cd, respectively. The main advantages of this method are relatively high sample mass, low dilution, suitable preconcentration factors and significantly low LOQs (ng g-1 range). When the proposed method was used for determining As and Cd in four sugar samples, their concentrations ranged from 1.13 to 2.95 ng g-1 and from 0.31 to 0.43 ng g-1, respectively.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.28 n.9 20172017-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901691en10.21577/0103-5053.20170005
institution SCIELO
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country Brasil
countrycode BR
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region America del Sur
libraryname SciELO
language English
format Digital
author Seeger,Tassia S.
Vecchia,Paula Dalla
Machado,Eduarda Q.
Reinke,Karine
Mesko,Marcia F.
Duarte,Fabio A.
spellingShingle Seeger,Tassia S.
Vecchia,Paula Dalla
Machado,Eduarda Q.
Reinke,Karine
Mesko,Marcia F.
Duarte,Fabio A.
Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
author_facet Seeger,Tassia S.
Vecchia,Paula Dalla
Machado,Eduarda Q.
Reinke,Karine
Mesko,Marcia F.
Duarte,Fabio A.
author_sort Seeger,Tassia S.
title Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
title_short Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
title_full Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
title_fullStr Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
title_full_unstemmed Feasibility of DLLME for the Extraction and Preconcentration of As and Cd in Sugar for Further Determination by ICP-MS
title_sort feasibility of dllme for the extraction and preconcentration of as and cd in sugar for further determination by icp-ms
description A method for determining low levels of As and Cd by dispersive liquid-liquid microextraction (DLLME) and inductively coupled plasma mass spectrometry (ICP-MS) was proposed. The following parameters that affect extraction efficiency were investigated: type and volume of extraction solvent (1000 µL acetone), type and volume of dispersive solvent (75 µL carbon tetrachloride), amount of ammonium pyrrolidinedithiocarbamate and sodium diethyldithiocarbamate as chelating agents, sample mass (0.5 g in 10 mL ultrapure water), pH of sample solution (2.0) and number of washing steps (one). Accuracy was evaluated by analytes determination in sugar samples by ICP-MS after digestion by microwave-induced combustion (MIC). No significant difference was observed between results of the proposed DLLME method and MIC in the case of both analytes. Instrument calibration was performed by the standard addition method and good linearity was achieved. Limits of quantification (LOQs) were 0.7 and 0.2 ng g-1 for As and Cd, respectively. The main advantages of this method are relatively high sample mass, low dilution, suitable preconcentration factors and significantly low LOQs (ng g-1 range). When the proposed method was used for determining As and Cd in four sugar samples, their concentrations ranged from 1.13 to 2.95 ng g-1 and from 0.31 to 0.43 ng g-1, respectively.
publisher Sociedade Brasileira de Química
publishDate 2017
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000901691
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