N-compounds speciation analysis in environmental samples using ultrasound-assisted solid-liquid extraction and non-chromatographic techniques

Autor(es)

Moreira, Ailton Jose ^{[1, 2]} ; Freschi, Carolina Dakuzaku ^[1] ; Pereira, Ernesto Chaves ^[2] ; Giovanni Freschi, Gian Paulo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Alfenas, Inst Sci & Technol, UNIFAL MG, LAFFEQ, BR-37715400 Pocos De Caldas, MG - Brazil

^[2] Univ Fed Sao Carlos, UFSCar SP, Chem Dept, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 193, n. 5 MAY 2021.
• Citações Web of Science: 0

Resumo

A fast, efficient, and non-chromatographic method was presented in this study for nitrite, nitrate, and p-nitrophenol (N-compounds) extraction and speciation analysis of environmental samples. By applying ultrasound-assisted solid-liquid extraction (USLE), analytes were efficiently extracted from water, soil, or sediment collected in areas of environmental disaster. These analytes were selectively converted to NO(g) through UV photolysis (NO3-), H2O2/UV photocatalysis (PNP), and direct conversion (NO2-). Following conversion, NO(g) was separated from the liquid phase and determined by high-resolution continuum source molecular absorption spectrometry (HR-CS MAS). The LODs obtained were 0.0970.004 mg L-1 for nitrite, 0.1190.004 mg L-1 for nitrate, and 0.090 +/- 0.006 mg L-1 for p-nitrophenol. On applying this speciation method to environmental samples, concentrations were found to be up to 0.99 +/- 0.03 mg L-1 (NO2-), 49.80 +/- 2.5 mg L-1 (NO3-), and 0.10 +/- 0.02 mg L-1 (PNP). Finally, addition/recovery study of real water, soil, and sediment samples showed 101 +/- 2% recovery for NO2-, 100 +/- 1% for NO3-, and 96 +/- 5% for PNP. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
• Beneficiário: Arlene Gonçalves Corrêa
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia