ジチゾン-メチルイソブチルケトン抽出を用いた水中のコバルト,ニッケル,銅,亜鉛,カドミウムおよび鉛の原子吸光分光光度測定に対する共存物質の影響

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The effects of 36 coexisting substances on the atomic absorption spectrophotometric determination of six metals extracted with dithizone-methyl isobutyl ketone (MIBK) from aqueous solution were studied. Eleven coexisting cations, 7 anions, and 18 organic materials were examined. The presence of 0.01〜0.02 mg/ml of Cr (III) supressed atomic absorbance of Co, and Ni, and 1 mg/ml of Fe (II) interfered with extraction of Co, Ni, Zn, and Pb, while Cr (VI), and Fe (III) did not interfere. These interferences may be caused by coprecipitation of Co, Ni, Zn, and Pb with hydroxides of Cr (III), and Fe (II) during pH control. However, these effects by the coprecipitation were completely removed by oxidation of Cr (III), and Fe (II). The coexisting of 0.004 mg/ml of CN^- interfered with complexation of Co, and Ni. No effects were found with the coexisting ions such as, Al (III), As (III), Bi (II), Ca (II), Mn (II), Mo (II), Sn (II), SO_8^<2->, S_2O_3^<2->, SO_4^<2->, PO_4^<3->, Br^-, and I^-. The presence of 0.1〜1 mg/ml of sodium n-dodecylbenzene sulfonate, tannic acid, sodium oleinate, sodium riguninsulfonate, and disodium ethylene diaminetetraacetate interfered with the extraction of Co, Ni, Cu, Zn, Cd, and Pb. These interferences were caused by the formation of emulsion of water and MIBK by some of organic substances. Taking into account the amounts of these interfering substances, this method was successfully applied to the determination of Co, Ni, Cu, Zn, Cd, and Pb of 1〜400 ppb in river water, drainage, and carbonated drinks without pretreating the sample by nitric and perchloric acid.
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ジチゾン-メチルイソブチルケトン抽出を用いた水中のコバルト,ニッケル,銅,亜鉛,カドミウムおよび鉛の原子吸光分光光度測定に対する共存物質の影響

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