Tratamento de água subterrânea contaminada com compostos organoclorados usando ferro elementar e o reagente de Fenton

Abstract

Recebido em 1/9/06; aceito em 15/2/07; publicado na web em 30/7/07 TREATMENT OF GROUNDWATER CONTAMINATED WITH CHLORINATED COMPOUNDS USING ELEMENTAL IRON AND FENTON'S REAGENT. The remediation of groundwater containing organochlorine compounds was evaluated using a reductive system with zero-valent iron, and the reductive process coupled with Fenton's reagent. The concentration of the individual target compounds reached up to 400 mg L -1 in the sample. Marked reductions in the chlorinated compounds were observed in the reductive process. The degradation followed pseudo-first-order kinetics in terms of the contaminant and was dependent on the sample contact time with the solid reducing agent. An oxidative test with Fenton's reagent, followed by the reductive assay, showed that tetrachloroethylene was further reduced up to three times the initial concentration. The destruction of chloroform, however, demands an additional treatment.

Degradation of food dyes by zero-valent metals exposed to ultrasonic irradiation in water medium: optimization and electrospray ionization mass spectrometry monitoring

“…These processes can be used to initiate remediation of complex anthropogenic chemicals, such as nitro and chlorinated aromatic compounds. [7][8][9][10][11] Dyes are another category of complex chemicals that are labile to reduction, as already shown for several dyes. [12][13][14][15][16][17][18] Several metals (such as Zn, Sn, Pt) can be used as reduction agents, but iron has received the foremost emphasis due to its high efficiency in addition to its low cost and toxicity.…”

Análise de pesticidas organoclorados em água usando a microextração em fase sólida por headspace com cromatografia gasosa e espectrometria de massas

“…[8][9][10] A cromatografia gasosa (GC; Gas Chromatography) com a utilização do detector por captura de elétrons (ECD; Electron Capture Detection) ou acoplado à espectrometria de massas (MS; Mass Spectrometry) é relatada como uma técnica bem definida para análise de organoclorados. 11 A exatidão e a precisão na análise de pesticidas depende do preparo da amostra (extração e pré-concentração) e da performance do instrumento.…”

Investigação de mudanças do status salino do solo pelo emprego de análise multivariada

“…Outro ponto a ser considerado para esta maior concentração é o fato do cloreto ser um íon conservativo, de difícil degradação na natureza, de maneira que o total de chuva precipitada na área não é suficiente para promover a lixiviação dos mesmos, ocorrendo, assim, ao longo dos tempos, um acúmulo maior nas camadas mais superficiais do solo (Fernandes et al, 2005;Arruda & Jardim, 2007).…”