Highly selective and sensitive monohydrogen phosphate membrane sensor based on molybdenum acetylacetonate |
| |
Authors: | Mohammad Reza Ganjali Parviz Norouzi Masoud Salavati-Niasari |
| |
Institution: | a Center of Excellence in Electrochemistry, Department of Chemisrtry, Tehran University, Tehran, Iran b Department of Chemistry, Azad University, North of branch, Tehran, Iran c Department of Chemistry, Kashan University, Kashan, Iran |
| |
Abstract: | In this work, a highly selective and sensitive monohydrogen phosphate membrane sensor based on a molybdenum bis(2-hydroxyanil) acetylacetonate complex (MAA) is reported. The sensor shows a linear dynamic range between 1.0 × 10−1 and 1.0 × 10−7 M, with a nice Nernstian behavior (−29.5 ± 0.3 mV decade−1) in pH of 8.2. The detection limit of the electrode is 6.0 × 10−8 M (∼6 ppb). The best performance was obtained with a membrane composition of 32% poly(vinyl chloride), 58% benzyl acetate, 2% hexadecyltrimethylammonium bromide and 8% MAA. The sensor possesses the advantages of short response time, low detection limit and especially, very good selectivity towards a large number of organic and inorganic anions including salicylate, citrate, tartarate, acetate, oxalate, fluoride, chloride, bromide, iodide, sulfite, sulfate, nitrate, nitrite, cyanide, thiocyanate, perchlorate, metavanadate, and bicarbonate ions. The electrode can be used for at least 10 weeks without any considerable divergence in its slope and detection limit. It was used as an indicator electrode in potentiometric titration of monohydrogenphosphate ion with barium chloride. The proposed sensor was successfully applied to direct determination of monohydrogenphosphate in two fertilizer samples (NPK). |
| |
Keywords: | Monohydrogenphosphate Potentiometry HPO42&minus Ion-selective electrode Molybdenum acetylacetonate |
本文献已被 ScienceDirect 等数据库收录! |
|