Laser-Induced Breakdown Spectroscopy Applied to the Quantification of K, Ca, Mg and Mn Nutrients in Organo-Mineral, Mineral P Fertilizers and Rock Fertilizers Cesar Cervantes, Bruno S. Marangoni, Gustavo Nicolodelli, Giorgio S. Senesi, Paulino R. Villas-Boas, et al. Minerals, 2024 A low-cost laser-induced breakdown spectroscopy (LIBS) instrument equipped with a charge-coupled device (CCD) was tested in the atmospheric environment for the quantification of K, Ca, Mg, and Mn in some organo–mineral fertilizers, mineral P fertilizers, and rock fertilizers of various compositions and origins, using flame atomic absorption spectrometry (FAAS) as the reference technique. The correlation analysis performed between each CCD pixel and the corresponding element concentration measured by FAAS allowed to choose the most appropriate K, Ca, Mg and Mn emission lines for LIBS analysis. The normalization process applied to LIBS spectra to correct physical matrix effects and small fluctuations was able to increase the linear correlation of the calibration curves between LIBS data and FAAS data by an average of 0.15 points of the R-value for all elements of interest. The R values of calibration curves were 0.97, 0.96, 0.86 and 0.84, for K, Ca, Mg and Mn, respectively. The limits of detection (LOD) were 66 mg/kg (K), 35 mg/kg (Ca), 5.4 mg/kg (Mg) and 0.8 mg/kg (Mn) when using LIBS in the quantification model. The cross-validation (leave-one-out) analysis yielded an absolute average error of 12% (K), 21% (Ca), 8% (Mg) and 13% (Mn) when LIBS data were correlated to FAAS ones. These results showed that the calibration models used were close to the optimization limit and satisfactory for K, Ca, Mg, and Mn quantification in the fertilizers and rocks examined.
Influence of the Collagen Fibre Bundle Arrangements on the Qualitative Aspect of Nile Tilapia (Oreochromis niloticus) Leather Journal of the Society of Leather Technologists and Chemists, 2023
Microwave-Assisted Extraction Fabio A. Duarte, Pedro V. Oliveira, Ana R.A. Nogueira Microwave Assisted Sample Preparation for Trace Element Determination, 2014
Simultaneous determination of arsenic, antimony and selenium in agronomic samples by hydride generation and optical emission spectrometry Brazilian Journal of Analytical Chemistry, 2013
Proficiency testing of animal nutrition laboratories Gilberto Batista de Souza, Ana Rita A. Nogueira, Vitor R. Del-Santo, Cristina Maria C. Picchi, Edílson S. Guimarães, et al. Accreditation and Quality Assurance, 2009
Soil calcium and pH monitoring sensor system Sherlan G. Lemos, Ana Rita A. Nogueira, André Torre-Neto, Aleix Parra, Julian Alonso Journal of Agricultural and Food Chemistry, 2007
In-soil potassium sensor system Sherlan G. Lemos, Ana Rita A. Nogueira, André Torre-Neto, Aleix Parra, Judit Artigas, et al. Journal of Agricultural and Food Chemistry, 2004
