Abstract A simple and selective emulsification microextraction (EME) method in conjunction with flame atomic absorption spectrometry (FAAS) is reported for the preconcentration of palladium ions in aqueous solution. In this approach, N-(3-chloro-4-fluorophenyl)-N-phenylthiourea (CFPT) was synthesized for the first time for the complexation of metal ions including manganese, nickel, cadmium, cobalt, copper, gold, lead, palladium, iron, zinc, aluminum, and chromium and platinum with the microextraction method. The new CFPT ligand provided excellent selectivity toward Pd2+ ions in highly acidic conditions. The formation of a palladium hydrophobic compound with the new synthesized ligand was extracted into chloroform by shaking a model solution for a few seconds. The cloudy solution was centrifuged and the organic phase containing Pd2+ was diluted with nitric acid and transferred for the monitoring of the palladium absorbance by FAAS. Under the optimum conditions, the linearity (R 2 = 0.9986) was in the range from 10 to 1000 µg L−1 and the limit of detection was 2.28 µg L−1 for Pd2+. The developed EME-FAAS method was successfully applied for preconcentration and determination of Pd2+ in spiked samples such as well, stream, tap and sea water with good recoveries.

中文翻译：

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火焰原子吸收光谱法对水样中钯的简单乳化微萃取

摘要 报道了一种结合火焰原子吸收光谱法 (FAAS) 的简单选择性乳化微萃取 (EME) 方法，用于预浓缩水溶液中的钯离子。该方法首次合成了N-(3-氯-4-氟苯基)-N-苯基硫脲(CFPT)，用于络合锰、镍、镉、钴、铜、金、铅、钯等金属离子、铁、锌、铝、铬和铂的微萃取法。新的 CFPT 配体在高酸性条件下对 Pd2+ 离子提供了出色的选择性。通过将模型溶液摇晃几秒钟，将与新合成配体形成的钯疏水化合物提取到氯仿中。将混浊溶液离心，将含有 Pd2+ 的有机相用硝酸稀释并转移用于通过 FAAS 监测钯吸光度。在最佳条件下，线性 (R 2 = 0.9986) 在 10 到 1000 µg L-1 范围内，Pd2+ 的检测限为 2.28 µg L-1。开发的 EME-FAAS 方法已成功应用于井水、河流、自来水和海水等加标样品中 Pd2+ 的预浓缩和测定，回收率良好。