Special Articles: Environmental Sciences and Analytical Chemistry. Concentration and continuous photodecomposition of dioxins using an immobilized hydrophobic monolayer.

HOSOYA Ken, KIMATA Kazuhiro, TANAKA Nobuo, Jr. D.G.Patterson

doi:10.2116/bunsekikagaku.43.977

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特集　環境科学と分析化学　固定化疎水性単分子層を用いる希薄ダイオキシンの濃縮と連続的光分解
コテイカソスイセイタンブンシソウオモチイルキハクダイオキシンノ
固定化疎水性単分子層を用いる希薄ダイオキシンの濃縮と連続的光分解

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Abstract

We used a hydrophobic solid support, octadecylsilylated silica gel C₁₈, packed in a quartz column as the reaction medium for the photolysis of 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (2, 3, 7, 8-TCDD) and 1, 2, 3, 4-TCDD. When we exposed the column to a 450 W UV lamp, the adsorbed 1, 2, 3, 4-TCDD or 2, 3, 7, 8-TCDD in 10% 2-propanol/water decomposed completely in 20 min and 5 min, respectively. The large estimated partition coefficient of 1, 2, 3, 4-TCDD in 10% 2-propanol/water (>1000) indicates that on the C₁₈ stationary phase, both the saturated hydrocarbon chains and the adsorbed 2-propanol may act as proton donors and accelerate the photolysis. In direct sunlight, the adsorbed 1, 2, 3, 4-TCDD in 10% 2-propanol/water decomposed much faster than in a nonaqueous solvent (50% 2-propanol/methanol). This solvent effect is advantageous for the practical application of the C₁₈ photolysis process in aqueous waste treatment. We have demonstrated that complete C₁₈ trapping with continuous photodecomposition of TCDD contained in an aqueous alcohol waste is possible.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 43 (11), 977-984, 1994

The Japan Society for Analytical Chemistry

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