文献类型：期刊文献

英文题名：Determination of trace chromium in water by graphite furnace atomic absorption spectrophotometry after preconcentration on a soluble membrane filter

作者：Gao, PY; Feng, RL; Zhang, HZ; Li, ZQ

机构：[1]E China Univ Sci & Technol, Inst Tech Chem & Phys, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Petrochem Inst, Dept Fundamental Courses, Shanghai 200540, Peoples R China;[3]Shanghai Henkel Oleochem Co Ltd, Shanghai 201512, Peoples R China;[4]Capital Normal Univ, Dept Chem, Beijing 100037, Peoples R China

年份：1998

卷号：31

期号：6

起止页码：1095

外文期刊名：ANALYTICAL LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000073535600015)】；

语种：英文

外文关键词：chromium; Graphite Furnace Atomic Absorption Spectrophotometry; concentration; soluble-membrane filter

摘要：A new concentration and determination method has been described for the determination of lower than 0.1 mu g L-1 levels of chromium (VI) in water, based on the reaction between chromium (VI) and phenylfluorone (PF) to form an anionic chelate and the collection of the ternary ion-associate of the chelate with cetyltrimethylammonium bromide (CTMAB) (a cationic surfactant) on an organic solvent-soluble membrane filter. Determination of the solution obtained after dissolving the membrane and analyte in a suitable solvent is achieved using graphite furnace atomic absorption spectrophotometry,. The ternary complex (Cr(VI)-PF-CTMAB = 1:2:2) is collected on a 0.45 mu m nitrocellulose filter and the filter and analyte are dissolved in a small volume of 2-methoxyethanol (methylcellosolve) acidified with dilute sulphuric acid. The chromium is determined by graphite furnace atomic absorption spectrophotometry under optimum experimental conditions. A good linear relationship exists in the range 0.05 - 0.30 mu g chromium in 5.0 mi, with satisfactory reproducibility. The detection limit, defined as three times the standard deviation of the blank, is 0.06 mu g L-1 with 20 fold preconcentration. The ions normally present in water do not interfere under the experimental conditions used. The proposed method has been applied to the concentration and determination of chromium (VI) in water samples from several sources by means of direct graphic furnace atomic absorption spectrophotometry; the recoveries of chromium (VI) added to the samples are quantitative, and results found are satisfactory.