Multi-pumping flow system for the determination of nitrite and nitrate in water samples

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Carmen Pons (Autor) Outra; Joao L M Santos (Autor) FFUP; Jose L F C Lima (Autor) FFUP; Rafael Forteza (Autor) Outra; Victor Cerda (Autor) Outra

Revista

Título: Mikrochimica Acta

Vol. 161 Nº 1

Páginas: 73-79

ISSN: 0026-3672

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 21 Citações

ISI Web of Science

Scopus - 24 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

CORDIS: Ciências da Saúde

Outras Informações

ID Authenticus: P-004-0NA

DOI: 10.1007/s00604-007-0822-z

Resumo (PT): A multi-pumping flow system for the spectrophotometric determination of nitrite and nitrate is described. The determination of nitrite is based on the Griess-Ilosvay reaction. Nitrate can be determined after its on-line reduction to nitrite using hydrazine sulphate in alkaline medium. Calibration was linear up to 3 mg NO₂ ⁻ L⁻¹ with a limit of detection (3s_b/S) of 0.013 mg NO₂ ⁻ L⁻¹ an injection throughput of 55 injections h⁻¹ and a repeatability (RSD) of 0.5% for the direct determination of nitrite. Two calibration graphs within the ranges 0.039–7 mg NO₃ ⁻ L⁻¹ and 0.026–5 mg NO₂ ⁻ L⁻¹ were run for the determination of nitrate and nitrite under reducing conditions, respectively. A limit of detection of 0.039 mg NO₃ ⁻ L⁻¹ was obtained. An injection throughput of 27 injections h⁻¹ and an RSD lower than 1.5% were achieved. The method was successfully applied to the determination of nitrite and nitrate in water samples. <br> <br> Keywords: Multi-pumping flow system (MPFS); nitrite; nitrate; on-line reduction; hydrazine sulphate <br> <a target="_blank" href="http://web.ebscohost.com/ehost/detail?vid=3&hid=107&sid=ba7b75e9-6c43-4bca-8f7c-59d34ecffd4c%40sessionmgr110&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d"> Texto integral </a> <br> <br>

Abstract (EN): A multi-pumping flow system for the spectrophotometric determination of nitrite and nitrate is described. The determination of nitrite is based on the Griess-Ilosvay reaction. Nitrate can be determined after its on-line reduction to nitrite using hydrazine sulphate in alkaline medium. Calibration was linear up to 3mg NO2- L-1 with a limit of detection (3s(b)/S) of 0.013 mg NO2- L-1 an injection throughput of 55 injections h(-1) and a repeatability (RSD) of 0.5% for the direct determination of nitrite. Two calibration graphs within the ranges 0.039-7 mg NO3- L-1 and 0.026-5 mg NO2- L-1 were run for the determination of nitrate and nitrite under reducing conditions, respectively. A limit of detection of 0.039 mg NO3- L-1 was obtained. An injection throughput of 27 injections h(-1) and an RSD lower than 1.5% were achieved. The method was successfully applied to the determination of nitrite and nitrate in water samples.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7