Manzoori J L, Sorouraddin M H, Shemirani F
Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Talanta. 1995 Aug;42(8):1151-5. doi: 10.1016/0039-9140(95)01556-q.
A simple and convenient method has been developed for the speciation of chromium(III) and chromium(VI) in aqueous solutions using a sodium dodecyl sulphate coated alumina micro-column (1.5 cm x 5 mm i.d.) and graphite furnace-atomic absorption spectrometry (GF-AAS). Under the optimized conditions (pH 0.6, adjusted with hydrochloric acid; flow rate, 1 ml min(-1)) chromium(VI) is retained on the column and chromium(III) is collected and determined by GF-AAS. Total chromium is directly determined by GF-AAS and chromium(VI) is calculated by difference. The relative standard deviations (10 replicate analyses) at the 20 mug l(-1) level for chromium(III) and chromium(VI) and at the 40 mug l(-1) level for total chromium were 1.4%, 3.6% and 1.8%, and the corresponding limits of detection (based on 3sigma) were 0.57 mug ml(-1), 0.61 mug ml(-1) and 0.35 mug l(-1) respectively. No large interference effects have been observed from other investigated species and the method has been successfully applied to a range of water samples.
已开发出一种简单便捷的方法，用于使用十二烷基硫酸钠包覆的氧化铝微柱（内径1.5厘米×5毫米）和石墨炉原子吸收光谱法（GF-AAS）对水溶液中的铬（III）和铬（VI）进行形态分析。在优化条件下（用盐酸调节pH为0.6；流速为1毫升/分钟），铬（VI）保留在柱上，铬（III）被收集并用GF-AAS测定。总铬直接用GF-AAS测定，铬（VI）通过差值计算得出。铬（III）和铬（VI）在20微克/升水平以及总铬在40微克/升水平的相对标准偏差（10次重复分析）分别为1.4%、3.6%和1.8%，相应的检测限（基于3σ）分别为0.57微克/毫升、0.61微克/毫升和0.35微克/升。未观察到其他所研究物种有较大干扰效应，该方法已成功应用于一系列水样。
