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Production of Chloride and Hypochlorite for Analytical Purposes by Sonochemical Degradation of Organochlorines

Title
Production of Chloride and Hypochlorite for Analytical Purposes by Sonochemical Degradation of Organochlorines
Type
Article in International Scientific Journal
Year
2005
Authors
Mauro Korn
(Author)
Other
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Maria Soledad M. S. F. Acevedo
(Author)
Other
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Sivanildo S. Borges
(Author)
Other
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Journal
Vol. 16 No. 5
Pages: 988-994
ISSN: 0103-5053
Indexing
Scientific classification
FOS: Medical and Health sciences > Other medical sciences
CORDIS: Health sciences
Other information
Authenticus ID: P-000-1NF
Resumo (PT): Neste trabalho foram enfatizadas as potencialidades da geração sonoquímica de reagentes pela irradiação ultra-sônica de resíduos de organoclorados de efluentes laboratoriais com a produção de soluções de cloreto e hipoclorito para propósitos analíticos. Foi avaliada a dependência entre a produção de cloreto obtida pela sonicação de efluentes contendo organoclorados e o tempo de irradiação para CCl4, CHCl3, CH2Cl2 e do inseticida Thiamethoxam®. Sob condições de saturação pôde ser observada a maior produção de cloreto para CHCl3. O processo sonoquímico de geração de cloreto mostrou boa precisão (RSD < 10%). A extensão da geração sonoquímica de hipoclorito foi também avaliada quando conduzida em presença de concentrações diferentes de NaOH. O hipoclorito gerado pela degradação de resíduos foi monitorado pelo método de Berthelot, empregado para a determinação de NH4 +. Os resultados da produção de azul de indofenol obtidos com soluções de hipoclorito geradas sonoquimicamente foram comparados, para diferentes concentrações de NH4 +, com solução comercial do reagente e nenhuma diferença significativa (nível de confiança de 95%) foi constatada. <br> <br> Keywords: ultrasonic irradiation, sonochemical degradation, reagent generation, chloromethanes, hypochlorite generation <br> <a target="_blank" href="http://jbcs.sbq.org.br/jbcs/2005/vol16_n5/15-251-04.pdf">Texto integral </a> <br> <br>
Abstract (EN): This work was aimed at highlighting the potentialities of the reagent generation by ultrasonic irradiation to produce chloride and hypochlorite solutions for analytical purposes derived from the residues of organochlorines of laboratory effluents. The dependence between the production of chloride obtained from the sonication of effluents containing organochlorines and the irradiation time was evaluated for CCl4, CHCl3, CH2Cl2 and Thiamethoxam®. It was observed that under saturation conditions the production of chloride was highest for CHCl3. Additionally, good precision related to the sonochemical generation of chloride was achieved (RSD < 10%). The extent of sonochemical generation of hypochlorite was also evaluated in the presence of different NaOH concentrations. The hypochlorite generated by the degradation of CCl4 residues was monitored by the reference Berthelot method for NH4 + determination. The results obtained with hypochlorite solution sonochemically generated for different NH4 + concentration were compared with the conventional reagent and no significant difference (95% confidence level) was found. <br> <br> Keywords: ultrasonic irradiation, sonochemical degradation, reagent generation, chloromethanes, hypochlorite generation <br> <a target="_blank" href="http://jbcs.sbq.org.br/jbcs/2005/vol16_n5/15-251-04.pdf">Full text</a> <br> <br>
Language: Portuguese
Type (Professor's evaluation): Scientific
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