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Study of Inorganic Profiles of Street Cocaine Samples Using ICP-MS and ICP OES
Amorim,Zanata B.; Machado,Maiara P.; Moro,Mariana K.; Rebouças,Laura O.; Dalfior,Bruna M.; Romão,Wanderson; Filgueiras,Paulo RobertoDetermining inorganic constituents in illicit drugs can indicate its purity and presence of adulterants. In this study, we analyzed 52 street cocaine samples, seized in three different regions of Espírito Santo, state of Brazil. Inductively coupled plasma optical emission spectrometry was used to determine Al, Ca, Cu, Fe, Mn, Mg, Zn concentrations and inductively coupled plasma mass spectrometry to determine Mo...
Arsenic and Other Elements Determination in Seawater Using Coprecipitation and ...
Conceição,Vitor N. da; Campos,Taynara G.; Dalfior,Bruna M.; Heringer,Otávio A.; Brandão,Geisamanda P.; Carneiro,Maria Tereza W. D.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 c...
Multi-Element Evaluation in Black Pepper (Piper nigrum L.) According to the Pro...
Krause,Maiara; Vieira,Luiza V.; Cunha,Tiago P.; Brandão,Geisamanda P.; Filgueiras,Paulo Roberto; Carneiro,Maria Tereza W. D.Black pepper is one of the most consumed spices worldwide and the evaluation of trace elements content is essential to promote consumer safety. In this study, concentrations of the elements As, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Se, V and Zn was determined in samples of black peppercorn (n = 25) and ground black pepper (n = 25) to verify how processing affects element concentrations. The elements were determined b...
ANÁLISE EXPLORATÓRIA DAS CONCENTRAÇÕES DOS METAIS NA, CA, MG, SR E FE EM EXTRAT...
Souza,Murilo de O.; Rainha,Karla P.; Castro,Eustáquio Vinícius R.; Carneiro,Maria Tereza W. D.; Ferreira,Rafael de Q.AbstractThe purpose of this study was to evaluate the best operating conditions of ICP OES for the determination of Na, Ca, Mg, Sr and Fe in aqueous extract of crude oil obtained after hot extraction with organic solvents (ASTM D 6470-99 modified). Thus, the full factorial design and central composite design were used to optimize the best conditions for the flow of nebulization gas, the flow of auxiliary gas, a...
Comparison of different pre-treatment procedures for the determination of chrom...
Pessoa,Helen M.; Lyra,Fernanda H.; Castro,Eustáquio Vinicius R. de; Campos,Reinaldo C. de; Carneiro,Maria Tereza W. D.; Brandão,Geisamanda P.In the present study three pre-treatment procedures were developed and compared following Cr determination by GF AAS: sample dilution with toluene, emulsion formation and direct sampling of crude oil. The limits of detection for the developed procedures were 1.9 ng g-1 for sample dilution with toluene, 2.8 ng g-1 for emulsion formation and 0.73 ng g-1 for direct sampling. The accuracy of the three procedures wa...