Flow Injection Spectrophotometric Determination of Formaldehyde Using New Color Reaction
Tutor / director / evaluatorTeshima, Norio
Document typeMaster thesis (pre-Bologna period)
Rights accessRestricted access - confidentiality agreement
Formaldehyde (HCHO) is the most common air pollutant of the aldehyde family. It is known to be a toxic and carcinogenic compound present in both residential indoor and industrial environments. Exposition to formaldehyde in higher concentrations (over 0,1 ppmv) can cause well-known effects as irritation of the eyes and upper respiratory tract, headache, nausea, difficulty in breathing, allergic skin reactions, among others. Rapid and reliable methods are still required for the determination of formaldehyde, so the objective of this project is to develop an affordable, cost-effective and easy-to-use flow based spectrophotometric method for the measurement of formaldehyde (HCHO) in liquid samples. This Flow Injection Analysis (FIA) provides advantages as reproducibility, simplicity, low cost, flexibility and high sensitivity that previous batch-wise assays didn’t have. Previous research has been carried out to find a suitable chemical basis and referring to previous papers of chemical journals the reaction will be held between hydroxyl ammonium sulfate and the analyte, formaldehyde. After this, a reaction between exceeds of hydroxyl ammonium sulfate, Fe(III) and a ligand will take place. A colored-complex will be produced. To determine the concentration of formaldehyde an indirect analysis is done. The decrease of the colored-complex compound is proportional to the concentration of formaldehyde. The flow-based system will be studied and developed to obtain the optimum work conditions. Studied parameters will be: temperature in reaction coil, length of reaction coils, flow rate, pH of buffer, and concentration of reagents. Under the optimum conditions the calibration curve will be determined. The reliability of the system will be checked by the analysis of industrial waste water that contains formaldehyde and compared to a standard method. As direct application of the system is the analysis of industrial wastewater it will be necessary a study of interference compounds. Results of the study accomplish the prospects above mentioned. The system is a reliable flowbased spectrophotometric method for the easy and rapid determination of the concentration of formaldehyde. Moreover it is a highly sensitive system with high repeatability that has no significant difference in results compared to a standard method.
SubjectsFormaldehyde, Sewage -- Analysis, Spectrum analysis, Metanal, Aigües residuals -- Anàlisi, Anàlisi espectral
ProvenanceAquest document conté originàriament altre material i/o programari no inclòs en aquest lloc web
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