吸光光度法による水溶液中トリエチル鉛イオンの定量
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1-Hydroxy-4-(<I>p</I>-nitrophenylazo)-2-naphthoic acid sodium salt (HNPAN-Na) was found to react with triethyl lead ion (Et<SUB>3</SUB>Pb<SUP>+</SUP>) selectively and quantitatively, and was applied to the determination of triethyl lead. HNPAN-Et<SUB>3</SUB>Pb<SUP>+</SUP> was extracted into chloroform 1% aqueous NaCl solution (pH 8.18.3), and the absorbance at 440mμ was measured by using 1cm cell. A linear calibration line was obtained for 4.4117.6μg of Et<SUB>3</SUB>Pb<SUP>+</SUP> in 10m<I>l</I> of chloroform by using 2m<I>l</I> HNPAN-Na (10<SUP>-3</SUP>M aqueous solution) with an extraction period of 1 minute. The extract was stable enough for a long time and, in the presence of ethylenediamine diorthohydroxyphenylacetic acid, inorganic lead and diethyl lead did not interfere. The lower limit of determination was 0.2ppm for triethyl lead.
- 社団法人 日本分析化学会の論文
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