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Spectrophotometric Determination Of Formaldehyde In The Complex System Of Cobalt(Ⅱ)-Amine Compound,Synthesis And Structural Characterization Of 3-amino-4-aminomethyl-benzenesulfonate

Posted on:2006-10-03Degree:MasterType:Thesis
Country:ChinaCandidate:A M LiuFull Text:PDF
GTID:2121360155470838Subject:Analytical Chemistry
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As some substance that has higher toxicity and matamorphism fountainhead, formaldehyde would endanger greatly to our ecological environment and continual development. A review with summation in perface is given on the impersonal effects of formaldehyde in atmosphere, water, the chain of biology and cells, respectively. All the potential factors would endanger seriously continual development are discussed too. The aim of the review is to make people recognize this danger, ie, the toxicity of formaldehyde not only rest on indoor air which belongs to ordinary administrative levels, but on atmosphere, water, the chain of biology and cells, so it's a multi-tiered, double-entry and network distributed environmental risk. It must harm the whole environment in the future, if we would neglect its' presence in some way.The primary researchful method is based on the sensitive effect of formaldehyde in the complex system of cobalt( Ⅱ) with ethylenediamine in sulfate acid medium. Formaldehyde in the linear concentration range of 0.10~3.6μg/mL is determined with a detection limit of 0.086μg/mL, and the correlation coefficients is 0.9976. This method is simple, quick and convenient, and has good reproduction.A investigation with 29 kinds of metal ions is proposed on the sensitive effect of formaldehyde and the different buffuer solution for the change about photometric characterization in the complex system of metal ions- Hydroxylamine-Ethylenediamine. It is showed that 11 metal ions could give color reaction and some analytical properties, including AA, composition, stability constant and apparent molar absorptivities are studied. Some preparatory bases for a new spectrophotometric method about the determination of formaldehyde in the complex system of cobalt(Ⅱ) - Hydroxylamine- Ethylenediamine is provided.The conditions of the color complex system composed of cobalt ( II ) -hydroxylamine-ethylenediamine with formaldehyde are tested with the model of AHP by orthogonal design. The best conditions are followed: 5.00×10~-2mol/L hydroxylamine 2.00mL, 1.00×10~-1mol/L ethylenediamine 3.00mL, 2.00×10~-1mol/L cobalt (Ⅱ) 5.00mL, 0.200mol/L vitriol 0.800mL and 55℃ water-bathing for6min .Good results for formaldehyde determination in the complex system of cobalt ( II) - hydroxylamine-ethylenediamine could be obtained.Spectrophotometric method for the determination of formaldehyde is proposed. The method is based on the sensitive effect of formaldehyde in the complex system of cobalt (II) -hydroxylamine- ethylenediamine in sulfate acid medium. The stable system of cobalt (II) -hydroxylamine- ethylenediamine could keep seven days at 25 degrees Celsius. Formaldehyde in the linear concentration range of 0.080~3.20Hg/mL is determined with a detection limit of 0.0610!^g/mL, and the correlation coefficients was 0.9987. This method is simple, quick and convenient, has high sensitivity and good reproduction. It has been applied to measure formaldehyde concentrations in the tap water and UF resin with satisfactory results.The reserach for synthesizing some novel diamines compound is based on the sensitive effect of formaldehyde in the complex system of cobalt ( II ) - diamines compound .In this paper, the method of preparation for o-amino-benzylamine and 3-amino-4-aminomethylbenzenesulfonate is briefly reviewed and, starting from o-nitro-toluene, it is synthesized by sulphication and photochlorination followed by Holfmann amination, and reduced by hydrazine hydrate in the presence of Raney-Ni. Their structure are identified by IR, mass spectra and *HNMR. By optimization, the yield and purity of o-amino-benzylamine reached to 65.4% and 98.6% (HPLC) respectively, the yield and purity of 3-amino-4-aminomethylbenzenesulfonate reached to 62.8% and 99.2% (HPLC) respectively. The method is simple and convenient and has the advantages of higher yield.
Keywords/Search Tags:formaldehyde, photometric characterization, hydroxylamine, ethylenediamine, cobalt (Ⅱ), spectrophotometer, o-amino-benzylamine, 3-amino-4-aminomethylbenzenesulfonate
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