Bipyridine-functionalized covalent-organic-framework-modified screen-printed electrode for ultrasensitive electrochemical determination of arsenic (III)

International Journal of Electrochemical Science, Год журнала: 2024, Номер 19(9), С. 100720 - 100720

Опубликована: Июль 16, 2024

The high toxicity of the arsenic ion (As3+) and its proliferation as a contaminant make it significant threat to environment well human beings. Therefore, recent years have witnessed development novel strategies for ultrasensitive detection As3+. In this study, we design covalent organic framework (COF) modify screen-printed electrode electrochemical determination As3+ via square wave anodic stripping voltammetry (SWASV). As proof concept, propose bipyridine-containing COF, namely BPTB, which is modification material with large Brunauer–Emmett–Teller (BET) surface area, selectivity, good anti-interference properties. extremely selective receptors are nitrogen-based sites, bipyridine-group skeleton serves signal transducer. COF-modified exhibits an ultralow limit 38.09 nmol/L wide linear response range 0.1–80 μmol/L under optimal conditions. addition, properties characterized cyclic impedance spectroscopy. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis confirms existence strong interaction between bipyridine sites BPTB As3+, influences current intensity modified electrode. summary, study not only highlights application potential COFs but also demonstrates novel, convenient approach constructing by creatively introducing chelating toxic metals.

Язык: Английский

Characterization of Wastewater and Detection of Ceftriaxone at Tirunesh Beijing General Hospital, Addis Ababa, Ethiopia

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

This study was assessed the physicochemical characteristics of wastewater discharged from Tirunesh Beijing General Hospital, Addis Ababa, Ethiopia. The results were evaluated concerning compliance with standards set by Ethiopian Environmental Protection Agency. showed that significant deviations EEPA. Especially, pH value within accepted range at 7.05 ± 0.19, while EC a very high 1.576 0.0043 µS/cm exceeded standard 1 µS/cm. Total nitrogen (TN) (0.1295 0.0041 mg/L), and total phosphorus (TP) (0.46744 mg/L) which below limit. However, BOD COD values their limits 12.7 0.56 mg/L 138.677 3.955 mg/L, respectively. Analysis for heavy metals also lead (0.1134 chromium (0.07833 cadmium (0.03191 above EPA limits. Ceftriaxone concentrations on another hand (0.083 µg/mL) discharge limit 0.03 µg/L. These emphasize need treatment system Hospital to minimize environmental pollution protect public health. relatively levels detected contaminants pose great risks like development antibiotic resistance bacteria genes affect both aquatic life human

Язык: Английский