Determination of anionic surfactant in water by indirect atomic absorption spectrometry after solvent extraction with potassium-dibenzo-18-crown-6

NAKAMURA Eiko, FUJISAWA Izumi, NAMIKI Hiroshi

doi:10.2116/bunsekikagaku.32.5_332

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カリウム‐ジベンゾ‐１８‐クラウン‐６を用いる水中の陰イオン界面活性剤の溶媒抽出間接原子吸光定量
カリウム -ジベンゾー18 クラウン 6 オモチイルスイチュウノインイ
カリウム-ジベンゾ-18-クラウン-6を用いる水中の陰イオン界面活性剤の溶媒抽出間接原子吸光定量

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Description

An indirect atomic absorption method for the determination of anionic surfactants in water is proposed. The method is based on the extraction of the ion-pair formed between anionic surfactants and potassium-dibenzo-18-crown-6-cation (K-DBC-6). The proposed procedures are as follows. Take a sample containing (550) μg as DBS of anionic surfactant into a 100ml separating funnel and adjust the pH to about 5 with 10ml of K₂SO₄(0.02M) -CH₃COONH₄ (0.05M) solution and then make up to 50ml with water. Add 10ml of DBC-6 (5×10^-4 M) MIBK solution. Shake for 1 min and allow to stand for several minutes. Discard the aqueous phase and wash the MIBK phase with 25ml of K₂SO₄(0. 004 M) -CH₃COONH₄ (0.01M) solution. Aspirate the MIBK phase to atomic absorption apparatus and measure the absorbance of potassium at 766.5nm. By this method, a linear relationship was obtained between the absorbance and theconcentration of anionic surfactant in the range of (550)μg as DBS. Large amounts of Li⁺ and Na ⁺ interfered, but their interference could be removed by washing the MIBK phase with K₂SO₄(0.004M) -CH₃COONH₄ (0.01M) solution. Good agreements were obtained between the values by this method and by methylene blue method on the analysis of river water and sewage

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 32 (5), 332-336, 1983

The Japan Society for Analytical Chemistry

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