Comparison of analytical performance of benchtop and handheld energy dispersive X-ray fluorescence systems for the direct analysis of plant materials

Autor(es)

Bueno Guerra, Marcelo Braga ^[1] ; de Almeida, Eduardo ^[1] ; Carvalho, Gabriel G. A. ^[1] ; Souza, Paulino F. ^{[2, 1]} ; Nunes, Lidiane Cristina ^[1] ; Santos Junior, Dario ^[3] ; Krug, Francisco Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Res Support Ctr Technol & Innovat Sustainable Agr, Ctr Energia Nucl Agr, BR-13416000 Piracicaba, SP - Brazil

^[2] Ctr Tecnol Canavieira, BR-13400970 Piracicaba, SP - Brazil

^[3] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 29, n. 9, p. 1667-1674, SEP 2014.
• Citações Web of Science: 18

Resumo

The analytical performances of benchtop and handheld energy dispersive X-ray fluorescence spectrometry (EDXRF) systems were evaluated aiming at the direct and simultaneous determination of P, K, Ca, S, Fe, Mn, and Si in plant materials. Pressed pellets of comminuted leaves from 23 varieties of sugar cane were used as laboratory samples. Both systems presented similar figures of merit, and were able to provide useful data for plant nutrition diagnosis. Linear correlation between the elemental mass fractions in the test samples and characteristic X-ray intensities was obtained for all analytes with both types of equipment. Correlation coefficients from 0.9601 to 0.9918 and from 0.9094 to 0.9948 were attained for benchtop and handheld EDXRF, respectively. The coefficient of variation of measurements carried out in 3 different test samples was also appropriate, being lower than 13% for all analytes. Limits of detection were comparable for both systems (20 mg kg(-1) for Fe and Mn, and approximately 0.1 g kg(-1) for P. K, Ca, S and Si) and permit the evaluation of the mineral nutrition status of sugar cane crop taking into account the critical levels of these elements. The handheld system is a cost-effective and appealing option for those who intend to carry out faster in situ and laboratory analysis with equivalent performance of the benchtop equipment. (AU)

• Processo FAPESP: 10/16379-0 - Estratégias de microamostragem para a análise de tecidos biológicos por espectrometria de emissão óptica com plasma induzido por laser
• Beneficiário: Gabriel Gustinelli Arantes de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/17158-8 - Avaliação da espectrometria de emissão óptica com plasma induzido por laser (LIBS) para determinação de contaminantes inorgânicos em fertilizantes agrícolas
• Beneficiário: Lidiane Cristina Nunes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/16203-5 - Estratégias para análise direta de folhas de cana-de-açúcar por espectrometria de emissão óptica com plasma induzido por laser (LIBS)
• Beneficiário: Marcelo Braga Bueno Guerra
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado