Desenvolvimento de procedimento analítico empregando multicomutação em fluxo para determinação fotométrica de cloreto em amostras de coque de petróleo / Development of analytical procedure employing multicommutation for photometric determination of chloride in petroleum coke
AUTOR(ES)
Andréia Cardoso Pereira
DATA DE PUBLICAÇÃO
2010
RESUMO
In this work was developed an analytical procedure employing multicommutation for the photometric determination of chloride in petroleum coke. The procedure was based on the photometric method described on Stand Method, where the reaction between mercury(II) thyocyanate and chloride causes the displacement of the thyocyanate ions, which reacted with iron(III) forming a compound that monitored at 472 nm. Two analysis modules were designed employing three-way and pinch solenoid valves. After the optimizing of the analytical parameters related to analysis module that employed three-way solenoid valves, the analytical curve presented a linear response in the concentration range of 0.25 to 4.0 mg L-1 (R = 0.997). A detection limit of 0.12 mg L-1 chloride, a relative standard deviation of 1.7 % (n = 15) and a sampling frequency of 50 determination per hour were also achieved. The second analysis module was designed to avoid acidification step of sample and reference solutions that was carried out off line to prevent bubbled delivering. The analytical curve presented a linear response within the concentration range of 0.25 up to 6.0 mg L-1 chloride (R=0.999). Detection limit of 0.04 mg L-1, standard deviation of 0.8 % (n=15), and sampling frequency of 50 determination per hours were of achieved. The proposed system was used for the determination of chloride in petroleum coke and also in certified material.
ASSUNTO(S)
multicomutação cloreto coque de petróleo multicommutation petroleum coke chloride
Documentos Relacionados
- Development of an automatic procedure for photometric determination of total N-ureide in legume using ulticommutation flow
- Desenvolvimento de um equipamento portátil e de sistema de análises em fluxo empregando multicomutação. Determinação fotométrica de ferro em águas de rios
- Development of analytical procedure for determination of paracetamol in pharmaceutical formulations employing flow injection analysis and spectrophotometric detection.
- Desenvolvimento de procedimento analítico em fluxo com multicomutação para a determinação espectofotométrica de ácido úrico em urina
- PROCEDIMENTO AUTOMÁTICO PARA DETERMINAÇÃO ESPECTROFOTOMÉTRICA DE HIDROQUINONA EMPREGANDO MULTICOMUTAÇÃO EM SISTEMA DE ANÁLISE EM FLUXO