A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters

A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters (2000)

Authors:
- Rocha, Fábio Rodrigo Piovezani
- Reis, Boaventura Freire dos
Autor USP: REIS, BOAVENTURA FREIRE DOS - CENA
Unidade: CENA
DOI: 10.1016/s0003-2670(99)00883-1
Subjects: QUÍMICA ANALÍTICA; MÉTODO ÓTICO
Language: Inglês
Abstract: A flow system for the speciation of inorganic nitrogen in waters is described. Multicommutation and binary sampling approaches are exploited to perform the sequential determination of nitrate, nitrite and ammonium without changing the manifold. Gravitational flow of solutions is employed in the sampling steps in order to avoid the effect of pulsation of the peristaltic pump on precision. A homemade photometer based on a dual-color (red/green) LED and a photodiode is employed to detect the reaction products. The repeatability was estimated as 0.32, 0.42 and 0.72% for nitrite, nitrate, and ammonium, respectively. A sampling rate of 60 determinations per hour was attained and the reagent consumption was reduced to 25% (ammonium) and 45% (nitrate and nitrite) relatively to conventional flow injection analysis (FIA) procedures. Detection limits of 5µgl-1 NO2- , 15µgl-1 NO3- , and 25µgl-1 NH4+ were estimated at the 99.7% confidence level. Results for river water samples agreed with those obtained by conventional FIA or ion chromatography at the 95% confidence level
Imprenta:
- Publisher place: Amsterdam
- Date published: 2000
Source:
- Título do periódico: Analytica Chimica Acta
- Volume/Número/Paginação/Ano: v. 409, p. 227-235, 2000

Informações sobre o DOI: 10.1016/s0003-2670(99)00883-1 (Fonte: oaDOI API)

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ABNT

ROCHA, Fábio Rodrigo Piovezani e REIS, Boaventura Freire dos. A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters. Analytica Chimica Acta, v. 409, p. 227-235, 2000Tradução . . Disponível em: https://doi.org/10.1016/s0003-2670(99)00883-1. Acesso em: 26 abr. 2024.
APA

Rocha, F. R. P., & Reis, B. F. dos. (2000). A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters. Analytica Chimica Acta, 409, 227-235. doi:10.1016/s0003-2670(99)00883-1
NLM

Rocha FRP, Reis BF dos. A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters [Internet]. Analytica Chimica Acta. 2000 ; 409 227-235.[citado 2024 abr. 26 ] Available from: https://doi.org/10.1016/s0003-2670(99)00883-1
Vancouver

Rocha FRP, Reis BF dos. A flow system exploiting multicommutation for speciation of inorganic nitrogen in waters [Internet]. Analytica Chimica Acta. 2000 ; 409 227-235.[citado 2024 abr. 26 ] Available from: https://doi.org/10.1016/s0003-2670(99)00883-1