Highly sensitive carbon paste electrode modified with a synthesized ferrocenyl Schiff base for trace determination of Ce(III) in real samples

Abstract

A recently new synthesized Schiff base was investigated to determine its capability as a modifier in carbon paste matrix to construct a potentiometric cation sensor. The developed modified carbon paste sensor under the optimized conditions reveals a Nernstian slope of 19.4 mV/decade to cerium(III) from 7.5 Â 10 À9 to 1.5 Â 10 À3 M and a low detection limit of 5.4 Â 10 À9 M. The specifications of the sensor were investigated according to the carbon paste composition, appropriate temperature and pH range, selectivity, and applicability. The sensor possesses a stable and short response time of 5 s. It represents many advantages such as feasible construction, renewability, wide determination range, high selectivity to Ce(III) ion, low limit of detection. The sensor was successfully carried out as an indicator electrode in potentiometric titration and determination of cerium(III) ion in mineral and spring water samples. The temperature dependence of the sensor potential was tested, and it was concluded that the sensor has a very low thermal coefficient in the temperature range of 15-55 C.

Ultrasensitive Chemically Modified Carbon Paste Sensor for Reliable and Selective Potentiometric Determination of Trace Amounts of Sitagliptin in Real Samples

“…Afterward, the standard potentials of the CPE (E 0 CPE ) at various temperatures were determined through the equation of E 0 cell =E 0 CPE – E 0 Ref . At the end, the temperature coefficient (dE 0 /dt) was calculated using the following equation: [39,40] …”

A simple, sensitive, and selective colorimetric chemosensor for sequential determination of dual analytes, Ce3+, H2PO4−, and its applications in the logic gate construction and the system of keypad lock

“…Also, the detection limit of this method is lower or at least comparable to the previous methods. Another important point is to perform this method in an aqueous media because CAL or CAL‐Ce 3+ can be completely dissolved in water [2–5, 10–12, 14, 43–45]. (Tables 4 and 5).…”

“…So the level of cerium in soil particles, human and animal bodies, as well as water ecosystems is constantly growing. Therefore, considering the wide applications as well as many environmental/biological impacts, its detetion and analysis have been in the center of attention in analytical and environmental chemistry [1][2][3][4][5]. Recently, Several methods have been presented to identify and measure cerium, such as neutron activation analysis (NAA) [6], X-ray fluorescence spectrometry [7], inductively coupled plasma mass spectrometry (ICP-MS) [2], electrochemical sensors [3,5], spectrofluorimetry [8], etc.…”