Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000, Osijek, Croatia.
Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000, Osijek, Croatia.
Talanta. 2021 May 1;226:122196. doi: 10.1016/j.talanta.2021.122196. Epub 2021 Feb 6.
A new solid-state potentiometric sensor for anionic surfactants (AnS) determination was prepared. The sensor material in the liquid membrane was made of multi-walled carbon nanotubes (MWCNTs) chemically functionalized with a quaternary ammonium group and tetraphenylborate (TPB) anion (MWCNT-N(CH)TPB). The response of the MWCNT-N(CH)TPB sensor was Nernstian (59.3 mV/decade of activity) for both AnS investigated (sodium dodecyl sulfate (NaDDS) and sodium dodecylbenzenesulfonate (NaDBS)). The limits of detection were 2.0 ∙ 10 and 1.5 ∙ 10 for NaDDS and NaDBS, respectively, and the average response time was only 5 s. The new MWCNT-N(CH)TPB sensor was very selective for NaDDS compared to anions usually contained in commercial products and is not affected by nonionic surfactants that can also be present in these products. It was tested to determine AnS concertation by the potentiometric titration method in a pH range between 3 and 12 and successfully applied for its determination in three-component mixtures and real systems.
一种用于阴离子表面活性剂（AnS）测定的新型固态电位传感器已制备。液体膜中的传感器材料由经季铵基团和四苯硼酸盐（TPB）阴离子（MWCNT-N（CH）TPB）化学功能化的多壁碳纳米管（MWCNT）制成。MWCNT-N（CH）TPB 传感器对所研究的两种 AnS（十二烷基硫酸钠（NaDDS）和十二烷基苯磺酸钠（NaDBS））的响应均为 Nernstian（活度每decade 59.3 mV）。NaDDS 和 NaDBS 的检测限分别为 2.0 ∙ 10 和 1.5 ∙ 10，平均响应时间仅为 5 s。与通常包含在商业产品中的阴离子相比，新型 MWCNT-N（CH）TPB 传感器对 NaDDS 具有非常高的选择性，并且不受也可能存在于这些产品中的非离子表面活性剂的影响。它已通过电位滴定法在 pH 值为 3 至 12 之间的范围内用于测定 AnS 的浓度，并成功应用于三元混合物和实际体系中的测定。
