Background: Cadmium (Cd2+) and lead (Pb2+) have acute and chronic effects on humans and other living organisms. In the present work, new, green and accurate dispersive micro solid-phase extraction (DμSPE) method for the separation and preconcentration of trace amounts of cadmium (Cd2+) and lead (Pb2+) ions in various food, water and tobacco samples collected from Saudi Arabia prior to its Flame Atomic Absorption Spectrometric (FAAS) determinations was developed.

Methods: The proposed method was based on a combination of oxidized multiwalled carbon nanotubes (O-MWCNTs) with a new chelating agent 5-benzyl-4-[4-methoxybenzylideneamino)-4H- 1,2,4-triazole-3-thiol (BMBATT) to enrich and separate trace levels of Cd2+ and Pb2+. The effect of separation parameters was investigated. The validation of the proposed preconcentration procedure was performed using certified reference materials.

Results: Analyte recovery values ranged from 95-102%, indicating that the method is highly accurate. Furthermore, precision was demonstrated by the relative standard deviation (RSD < 3.0%). The limits of detection were 0.08 and 0.1 μg L−1 for Cd2+ and Pb2+ ions, respectively. The preconcentration factor was 200.

Conclusion: The proposed method was used for the estimation of Cd2+ and Pb2+ ion content in various real samples, and satisfactory results were obtained. The proposed method has high adsorption capacity, rapid adsorption equilibrium, extremely low LODs, high preconcentration factors and shortens the time of sample preparation in comparison to classical SPE.

背景：镉（Cd2 +）和铅（Pb2 +）对人类和其他生物具有急性和慢性影响。在当前工作中，一种新的，绿色的，精确的分散微固相萃取（DμSPE）方法用于分离和预富集从沙特阿拉伯收集的各种食品，水和烟草样品中的痕量镉（Cd2 +）和铅（Pb2 +）离子开发了火焰原子吸收光谱法（FAAS）的阿拉伯半岛。

方法：所提出的方法是基于氧化多壁碳纳米管（O-MWCNT）与新型螯合剂5-苄基-4- [4-甲氧基苄叉亚氨基] -4H-1,2,4-三唑-3-硫醇的组合（BMBATT）富集和分离痕量Cd2 +和Pb2 +。研究了分离参数的影响。建议的预浓缩程序的验证是使用经过认证的参考材料进行的。

结果：分析物的回收率在95-102％之间，表明该方法非常准确。此外，相对标准偏差（RSD <3.0％）证明了精度。Cd2 +和Pb2 +离子的检出限分别为0.08和0.1μgL-1。预浓缩系数为200。

结论：该方法用于各种实际样品中Cd2 +和Pb2 +离子含量的估算，结果令人满意。与传统固相萃取相比，该方法具有较高的吸附容量，快速的吸附平衡，极低的检测限，较高的预富集因子，并缩短了样品制备时间。