Agradecimentos: The authors thank the National Council for Scientific and Technological Development (CNPq) for the undergraduate scholarship; the Teaching, Research and Extension Support Foundation (FAEPEX) of the University of Campinas (UNICAMP), and the Coordination for the Improvement of Higher...

Agradecimentos: The authors thank the National Council for Scientific and Technological Development (CNPq) for the undergraduate scholarship; the Teaching, Research and Extension Support Foundation (FAEPEX) of the University of Campinas (UNICAMP), and the Coordination for the Improvement of Higher Education Personnel (CAPES) for financial support; the Espaço da Escrita, Coordenadoria Geral da Universidade, UNICAMP, for the language services; and Daniel Augusto Camargo Bueno for technical support

Abstract: This paper compares the dichromate method with the photoelectrochemical method (PeCOD), with regards to the influence of chloride and turbidity with chemical oxygen demand (COD) determination. Whereas the upper limits of chloride concentration are well established for both techniques, the...

Abstract: This paper compares the dichromate method with the photoelectrochemical method (PeCOD), with regards to the influence of chloride and turbidity with chemical oxygen demand (COD) determination. Whereas the upper limits of chloride concentration are well established for both techniques, the influence of turbidity and the combined interference of underdosing chlorides and turbidity together have never been reported. When only potassium hydrogen phthalate or sorbitol were analyzed, the results show no significant difference in either method when 607 mg Cl- L-1 or 230 NTU of turbidity were added to the samples within the range of 100-900 mg L-1 COD. However, a combined effect of these two interferents leads to significantly different results, mainly for low COD range, as evidenced by the Student's t-test for paired samples (p = 0.05)

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

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