Minamisawa Hiroaki, Murashima Kenji, Minamisawa Mayumi, Arai Nobumasa, Okutani Tadao
Department of Basic Science and High Technology Research Center, College of Industrial Technology, Nihon University, Shin-ei, Narashino, Chiba 275-8576, Japan.
Anal Sci. 2003 Mar;19(3):401-4. doi: 10.2116/analsci.19.401.
A sensitive and simple method for the determination of trace amounts of indium in water samples by graphite furnace atomic absorption spectrometry (GFAAS) after coprecipitation with chitosan was investigated. Indium was quantitatively preconcentrated from water samples by coprecipitation with chitosan at pH 7.0-9.0. The coprecipitant was easily dissolved with acetic acid, and indium in the resulting solution was determined by GFAAS. The addition of lanthanum as a chemical modifier was more effective for the atomic absorbance of indium. The detection limit (S/N > or = 3) for indium was 0.04 microg dm(-3), and the relative standard deviations (n = 5) were 3.5-4.5% at 1.0 microg/100 cm3. The results obtained in this study indicate that the proposed method can be successfully applied to the determination of trace indium in water samples.
研究了一种灵敏且简便的方法，用于通过壳聚糖共沉淀后用石墨炉原子吸收光谱法（GFAAS）测定水样中的痕量铟。在pH 7.0 - 9.0条件下，铟通过与壳聚糖共沉淀从水样中定量预富集。共沉淀剂易溶于乙酸，所得溶液中的铟用GFAAS测定。添加镧作为化学改进剂对铟的原子吸收更有效。铟的检测限（S/N≥3）为0.04μg dm⁻³，在1.0μg/100 cm³时相对标准偏差（n = 5）为3.5 - 4.5%。本研究获得的结果表明，所提出的方法可成功应用于水样中痕量铟的测定。
