Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 32, Issue 1, Pages 231-236Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.21577/0103-5053.20200172
Keywords
seawater; arsenic; coprecipitation; ICP-MS
Categories
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brazil (CAPES) [001]
- Fundacao de Amparo a Pesquisa do Espirito Santo-Brazil (FAPES)
- LabPetro/UFES-Laboratorio de Pesquisa e Desenvolvimento de Metodologias para Analise de Petroleo
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This study successfully determined As, Co, Cr, Cu, Mn, and Pb in seawater using an optimized coprecipitation procedure, achieving low detection limits and good accuracy.
The present work aims the determination of As, Co, Cr, Cu, Mn and Pb in seawater samples using coprecipitation extraction procedure before standard mode inductively coupled plasma mass spectrometry (ICP-MS) (no collision/reaction cell). The coprecipitation procedure is based on the precipitation of Mg(OH)(2) from the reaction of the Mg2+ ions (present into the seawater) with ammonia added to the sample. Central composite design, desirability function, and response surface methodology were used to optimize the coprecipitation procedure. The optimum values obtained were 1200 mu L of aqueous ammonia, 30 min of centrifugation time and 400 mu L of nitric acid. The procedure obtained showed low limits of detection since good preconcentration factors were obtained. Good accuracy was also obtained when the reference material Trace Metals 1 in seawater was evaluated. Thus, the proposed procedure can be considered a good strategy for the determination of As, Co, Cr, Cu, Mn and Pb in seawater by ICP-MS, due to its simplicity, low cost, high analytical frequency, besides the good sensitivity and accuracy achieved.
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