クリスタルバイオレット-クロラニル酸抽出法による硫酸イオンの間接吸光光度定量

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The use of Crystal Violet for extraction of chloranilate ion released from the barium chloranilate was found to be effective for a sensitive determination method of sulfate ion. When a sample including (2〜8)μg sulfate was treated with 20 mg of barium chloranilate in 8 ml of 80 % 2-propanol aqueous solution, stoichiometric amounts of free chloranilate anion was released by the sulfate ion. The reaction mixture was filtered by a Teflon millipore filter with pore size of 0.2 μm. In order to remove 2-propanol from the medium the filtrate was passed through a column (5 mm i. d., 10cm length) packed with diethylaminoethyl cellulose, DE 52, and washed with water, and then the chloranilate ion trapped in the column was eluated with 4 ml of 0.1 N NaOH. The eluated chloranilate ion was further passed over a column (5 mm i. d., 5 cm length) of cation exchange resin, CG 120, to remove the excess of NaOH. The chloranilate ion thus obtained was extracted by using Crystal Violet at pH 1.5 into 5 ml of monochlorobenzene as an ion pair complex of [Crystal Violet^+-chloranilate^-]. The absorbance of monochlorobenzene layer was measured at 595 nm against a reagent blank. The molar absorptivity, ε, of the complex was calculated as 6.8×10^4 l mol^<-1> cm^<-1>. The proposed method was applied to the determination of sulfur oxides (10ppb) in ambient air and of sulfur (2 ppm) in benzene. The results were well agreed with those obtained by the standard method.
社団法人日本分析化学会の論文
1980-07-05

クリスタルバイオレット-クロラニル酸抽出法による硫酸イオンの間接吸光光度定量

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