Development of spectroanalytical methods for direct analysis of waste electrical a...
| Grant number: | 14/12595-1 |
| Support type: | Regular Research Grants |
| Duration: | October 01, 2014 - September 30, 2016 |
| Field of knowledge: | Physical Sciences and Mathematics - Chemistry |
| Principal Investigator: | José Anchieta Gomes Neto |
| Grantee: | José Anchieta Gomes Neto |
| Home Institution: | Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil |
| Assoc. researchers: | Edilene Cristina Ferreira ; Mario Henrique Gonzalez ; Mirian Cristina dos Santos |
Abstract
Elemental analyses by spectrometric techniques are commonly carried out employing direct introduction of liquid samples. Solid samples must then be converted into clear solutions. Conventional procedures based on wet and dry ashing are most commonly used for preparation of solid samples. Nevertheless, they are considered laborious, time consuming, susceptible to sample contamination and analyte losses, demand large amounts of reagents and energy, and may generate noteworthy volume of hazardous residues. The direct solid sampling presents advantages over introduction of liquid samples. This proposal deals with evaluation and application of the direct solid sampling in high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) to analysis of relevant samples to some strategic economic sectors in Brazil such as energy, environment, agriculture and beauty & care. Among applications are the determination of Mo and Co in biomass, and soil; Cd, Cr, Ni and Pb in cosmetics; Al, Fe and P in solar grade silicon. Certified reference materials, alternative techniques, or addition/recovery tests should be used for methods evaluation and validation. Well-established statistic tests will help to assess the main figures of merit (selectivity, recovery coefficients, linearity, precision, accuracy, limits of detection and quantification). (AU)