Nickel–zinc ferrite (Ni_0.5Zn₀.₅Fe₂O₄) nanosorbent was prepared and used for the efficient simultaneous preconcentration of arsenite and arsenate ions from aqueous solutions. The prepared nanoparticles were characterized by XRD measurements which indicated that the Ni_0.5Zn₀.₅Fe₂O₄ nanoparticles were synthesized well. The SEM results showed an average diameter of 27 nm for the nanoparticles. The adsorption capacity was found to be 35.8 and 62.5 mg g⁻¹ for As(III) and As(V), respectively. The adsorbed ions were then quantitatively eluted using 2 mL of 2 M NaOH solution as an elution solvent and determined spectrophotometrically. The maximum preconcentration factor for both the investigated ions was found to be 100. As(III) and As(V) species were determined in the mixture based on the difference in their adsorption behavior at different pHs. For an initial sample volume of 200.0 mL, the calibration graph was linear in the range 0.3–50.0 ng mL⁻¹ of As(III) and 0.2–75.0 ng mL⁻¹ of As(V) concentration. The method resulted in a successful determination of As(III) and As(V) in water samples.

中文翻译：

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Ni 0.5 Zn 0同时富集和测定水中痕量无机砷。5 Fe 2 O 4磁性纳米粒子

镍锌铁氧体（镍_0.5锌₀。₅的Fe ₂ ö ₄）被制备并用于从水溶液中砷和砷离子的有效的同时富集nanosorbent。通过X射线衍射（XRD）测量对制备的纳米颗粒进行表征，结果表明Ni _0.5 Zn ₀。很好地合成了_5个Fe ₂ O ₄纳米颗粒。SEM结果显示纳米颗粒的平均直径为27nm。发现吸附容量为35.8和62.5mg g ^-1分别用于As（III）和As（V）。然后使用2 mL 2 M NaOH溶液作为洗脱溶剂对吸附的离子进行定量洗脱，并通过分光光度法进行测定。两种被研究离子的最大预富集系数均为100。根据混合物在不同pH值下的吸附行为差异，确定了混合物中的As（III）和As（V）种类。对于200.0 mL的初始样品体积，校正曲线在0.3-50.0 ng mL ^-1的As（III）和0.2-75.0 ng mL ^-1的As（V）浓度之间呈线性关系。该方法成功测定了水样中的As（III）和As（V）。