全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
中外文文献  中文文献  外文文献
作者:Joaquim A. Nóbrega , Monika Winkler
来源:[J].Analytical and Bioanalytical Chemistry(IF 3.659), 2017, Vol.409 (18), pp.4449-4458Springer
摘要:Acid digestion is usually required for metal determination in food samples. However, this step is usually performed in batch mode which is time consuming, labor intensive, and may lead to sample contamination. Flow digestion can overcome these limitations. In this work, the ...
作者:... Daniela Schiavo , Joaquim A. Nóbrega , Ana Rita A. Nogueira
来源:[J].Microchemical Journal(IF 2.879), 2017, Vol.130, pp.271-275Elsevier
摘要:Abstract(#br)An analytical method was developed for determination of Cd, Sn, Pd, Pt and Rh in sediments, fertilizer and sludge samples by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS). The performance of ICP-MS/MS using oxygen into the octopole reaction sys...
作者:... Regina C. S. Müller , Joaquim A. Nóbrega , Dulcidéia C. Palheta
来源:[J].Química Nova(IF 0.737), 2009, Vol.32 (9), pp.2333-2335DOAJ
摘要:This work proposes an analytical procedure for direct determination of calcium, magnesium, manganese and zinc in buffalo milk by flame atomic absorption spectrometry (FAAS). Samples were diluted with a solution containing 10% (v/v) of water-soluble tertia...
作者:Cíntia S. Silva , Joaquim A. Nóbrega , Telma Blanco
来源:[J].Química Nova(IF 0.737), 2002, Vol.25 (6b), pp.1194-1196DOAJ
摘要:The goal of this study was to evaluate the feasibility of direct introduction of clay slurries in an inductively coupled plasma optical emission spectrometer with axial view configuration. Calibration was performed using a certified reference materia...
作者:... Marciana Catanho , Joaquim A. Nóbrega , Pedro O. Luccas
来源:[J].Química Nova(IF 0.737), 2000, Vol.23 (5), pp.706-708DOAJ
摘要:A tungsten coil atomizer was used to investigate the effect of heating programs with constant or variable drying temperatures on the atomization of Al, Cd, Cr and Pb. The variation of the surface temperature in the tungsten coil furnace can occur during e...
作者:Claudineia R. Silva , Joaquim A. Nóbrega , Telma Blanco
来源:[J].Química Nova(IF 0.737), 2005, Vol.28 (1), pp.137-140DOAJ
摘要:In this work a closed-vessel microwave-assisted acid decomposition procedure for clays was developed. Aluminum, Ca, Fe, K, Mg, Na, Si, and Ti were determined in clay digestates by inductively coupled plasma optical emission spectrometry. The most critical...
作者:Fabiana Rosini , Clésia C. Nascentes , Joaquim A. Nóbrega
来源:[J].Química Nova(IF 0.737), 2004, Vol.27 (6), pp.1012-1015DOAJ
摘要:Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave ...
作者:... José A. Gomes Neto , Joaquim A. Nóbrega , Pedro V. Oliveira
来源:[J].Química Nova(IF 0.737), 2003, Vol.26 (2), pp.249-252DOAJ
摘要:This paper describes a review on internal standardization in atomic absorption spectrometry with emphasis to the systematic and random errors in atomic absorption spectrometry and applications of internal standardization in flame atomic absorption spectro...
作者:... Luiz A. Ramos , Éder T. G. Cavalheiro , Joaquim A. Nóbrega
来源:[J].Química Nova(IF 0.737), 2009, Vol.32 (6), pp.1661-1666DOAJ
摘要:The use of thermoanalytical data in sample preparation is described as a tool to catch the students' attention to some details that can simplify both the analysis and the analytical procedure. In this case, the thermal decomposition of eggshells was ...
作者:... Eduardo A. Neves , Fábio R. P. Rocha , Joaquim A. Nóbrega
来源:[J].Química Nova(IF 0.737), 2002, Vol.25, pp.61-65DOAJ
摘要:This work presents an overview of the development of analytical chemistry in Brazil in the last 25 years under the influence of Brazilian Chemical Society (SBQ). It is shown that the common sense that analytical chemistry is still an under-developed area ...

我们正在为您处理中,这可能需要一些时间,请稍等。

资源合作:cnki.scholar@cnki.net, +86-10-82896619   意见反馈:scholar@cnki.net

×