A new method is reported for the separation of aluminium ions (Al3+) from interfering cations in dialysis concentrate solutions (DS) through solid phase extraction (SPE) using 2-methyl-8-hydroxyquinoline (2-MHQ). While separated Al3+ was preconcentrated by cloud point extraction (CPE) using 8-hydroxyquinoline (8-HQ) as complexing reagent, the resulting complex was entrapped in non-ionic surfactant (Triton X-114). Then fluorescence intensity of the Al3+-8-HQ complex was measured by spectrofluorimetry and the results were compared with those obtained by flame atomic absorption spectrometry. The chemical variables affecting the analytical performance of the CPE were studied and optimized. The validity of methodology was checked by the standard addition method, under optimum experimental conditions >98% recovery of Al3+ was obtained. The enrichment factor and detection limit of Al3+ for the preconcentration of 50 ml of DS were found to be 200 and 0.384 mu g L(-)1, respectively. The relative standard deviation for six replicate determinations of Al3+ at a concentration level of 50 mu g L-1 for both techniques was <6%. The effect of different interferent species was also studied. The proposed method has been applied for the determination of trace amount of Al3+ in DS samples with satisfactory results. The concentration of Al3+ in DS was observed in the range of 15.2-43.8 mu g L-1, which is above the permissible limit.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据