Solid phase extractive preconcentration of uranium on to 5,7-dichloroquinoline-8-ol modified naphthalene
Solid phase extractive preconcentration of uranium on to 5,7-dichloroquinoline-8-ol modified naphthalene
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DOI：
10.1081/al-120002683
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发表时间：
2002-01-01
影响因子：
2
通讯作者：
Rao, TP
中科院分区：
文献类型：
--
作者：
Gladis, JM;Rao, TP
介绍了用于铀预富集的固体试剂(5，7-二氯喹啉-8-醇)改性萘的制备。在pH 4.5-7.0的范围内，铀-5，7-二氯喹啉-8-醇络合物定量地保留在萘上。对于铀的预浓缩，在铀样品溶液中加入等分或上述试剂，调节到pH 5.5+/-1.0，过滤残留物并溶解在丙酮中，用偶氮砷III方法进行分析。校准曲线在铀浓度范围内是线性的，即每5毫升最终溶液含铀2-100杯。对每升样品中的40杯铀进行10次重复测定，平均吸光度为0.185，相对标准偏差为1.5%。3倍标准偏差的检出限为2 ng/ml。通过成功分析海洋沉积物标准物质，验证了所建立的预富集方法的有效性。
The preparation of solid reagent, (5,7-dichloroquinoline-8-ol) modified naphthalene for preconcentration of uranium is described. The uranium-5,7-dichloroquinoline-8-ol complex is quantitatively retained on naphthalene in the pH range 4.5-7.0. For the preconcentration of uranium an aliquot or the above reagent is added to the uranium sample solution, adjusted to pH 5.5 +/- 1.0 and the residue is filtered off and dissolved in acetone for analysis by the arsenazoIII method. Calibration graphs are linear over the uranium concentration range 2-100 mug per 5 ml of final solution. Ten replicate determinations of 40 mug of uranium present in one liter of sample gave a mean absorbance of 0.185 with a relative standard deviation of 1.5%. The detection limit corresponding to 3 times the standard deviation of the blank was found to be 2 ng/ml. The validation of the developed preconcentration procedure was carried out by successfully analysing standard marine sediment reference material.