New, simple and rapid spectrophotometric methods were described for the micro-determination of some rare earth metal ions uranium(VI), samarium(III) and cerium(III) using a new synthesized sulfacetamide azo dye derivative [2-((4-(N-acetylsulfamoyl)phenyl)diazenyl)-3,4,5-trihydroxybenzoic acid] (APDB). The new reagent was reacted with the three rare earth metal ions forming colored complexes at 500, 535 and 540 nm for U(VI), Sm(III) and Ce(III), respectively. The complexes were formed in alkaline medium using borate buffer at pH = 9 for U(VI) and Sm(III) and at pH = 8 for Ce(III). The absorbance of U(VI) and Sm(III)-APDB complexes was enhanced in the presence of CTAB as a cationic micellar media while that of Ce(III)-APDB complex was improved by using aerosol GPG surfactant. The proposed methods were also improved by using acetone and DMF as organic solvents for only U(VI) and Sm(III)-APDB complexes, respectively. The three metal ions complexes were formed by 1:2 (metal:ligand) ratio. Beer’s law was followed over the concentration range of 5–80, 10–160 and 10–80 µg mL⁻¹ for U(VI), Sm(III) and Ce(III), respectively. The proposed methods showed 0.8910, 2.454 and 2.750 µg mL⁻¹ limit of detection and 2.700, 7.436 and 8.335 µg mL⁻¹ quantification limit (LOQ) for U(VI), Sm(III) and Ce(III) complexes, respectively. The relative standard deviation was also calculated to be 0.00899, 0.00461 and 0.0180 for U(VI), Sm(III) and Ce(III) complexes, respectively. The interference effect of various diverse ions was also investigated. The proposed methods were successfully applied for the determination micro-amounts of the selected metal ions in some industrial, biological and plant samples.

中文翻译：

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分光光度法在新型有机试剂测定铀（VI），sa（III）和铈（III）中的分析应用

描述了一种新的，简单而快速的分光光度法，该方法使用新合成的磺乙酰胺偶氮染料衍生物[2-（（4-（ñ-乙酰氨基磺酰基）苯基）二氮烯基）-3,4,5-三羟基苯甲酸]]（APDB）。新试剂与三种稀土金属离子反应，分别在500、535和540 nm处形成U（VI），Sm（III）和Ce（III）的有色配合物。对于U（VI）和Sm（III），使用硼酸盐缓冲液在pH = 9的条件下，对于Ce（III）在pH = 8，在碱性介质中形成的络合物。在使用CTAB作为阳离子胶束介质的情况下，U（VI）和Sm（III）-APDB配合物的吸光度得到提高，而使用气溶胶GPG表面活性剂可以提高Ce（III）-APDB配合物的吸光度。通过分别使用丙酮和DMF作为仅U（VI）和Sm（III）-APDB配合物的有机溶剂来改进所提出的方法。三种金属离子络合物以1：2（金属：配体）的比例形成。在5–80、10–160和10–80 µg mL的浓度范围内遵循比尔定律^分别对于U（VI），Sm（III）和Ce（III）^-1。拟议的方法分别显示了U（VI），Sm（III）和Ce（III）配合物的检出限为0.8910、2.454和2.750 µg mL ^-1，检出限为2.700、7.436和8.335 µg mL ^-1（LOQ）。U（VI），Sm（III）和Ce（III）配合物的相对标准偏差也分别计算为0.00899、0.00461和0.0180。还研究了各种不同离子的干扰作用。所提出的方法已成功地用于测定某些工业，生物和植物样品中所选金属离子的微量含量。