Quantification of Sub‐Nanomolar Levels of Aluminum by Adsorptive Stripping Voltammetry Using Rubeanic Acid as a Selective Chelating Agent

Abstract

A novel, sensitive and selective adsorptive stripping procedure for determination of aluminum is presented. The method is based on the adsorptive accumulation of dithiooxamide (Rubeanic acid) complex of aluminum onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. The influences of control variables on the sensitivity of the proposed method for the determination of aluminum were studied. The optimum analytical conditions were found to be Rubeanic acid (RA) concentration of 8.0 10 À5 M, ammonia buffer (NH 3 ÀNH 4 Cl) pH of 6.5, and accumulation potential at À50 mV vs. Ag/ AgCl with an accumulation time of 60 s. The peak currents are proportional to the concentration of aluminum over the 0.3-70 ng mL À1 ranges with detection limit of 0.012 ng mL À1. The procedure was applied to the determination of aluminum in the Lab. Water, HCl of Merck and potato samples with satisfactory results.

Facile potentiometric sensing of gallic acid in edible plants based on molecularly imprinted polymer

“…Among these approaches, electrochemical analysis is one of the most facile methods due to its advantages of low cost, high sensitivity, and efficiency (Baig, & Sajid, 2017), and a variety of modified electrodes have been developed to improve the electrochemical signal response of the analyte (Balasubramanian, Balamurugan, Chen, Chen, & Lin, 2019;Devi et al, 2019). Based on the oxidizable characteristics of GA, voltammetry, including cyclic voltammetry, differential pulse voltammetry, stripping voltammetry, and square wave voltammetry, has been employed in almost all electrochemical measurements of GA (Abbasi, Daneshfar, Hamdghadareh, & Farmany, 2011;Shahamirifard, Ghaedi, Razmi, & Hajati, 2018;Tashkhourian, & Nami-Ana, 2015).…”

Concentration of serum trace elements in leukemia and lymphoma: A case-control study

“…All the glassware was washed by being soaked in diluted nitric acid overnight and rinsed with double-purified water before use. Stock element standard solutions (1000 ppm mL-1) were prepared by dissolving suitable amounts of chloride salts, and working solutions were made through the daily dilution of metal ions stock solutions [ 24 ].…”

“…Next, it was digested with an acidic combination of H2O2:H2SO4: HNO3 (1:1:3). The mixture was warmed up to 120○C for 2 h. The obtained solution was moved into а 25-ml volumetric flask, and its volume was raised to the intended value with double-purified water [ 24 , 25 ]. Ultimately, the concentrations of Zn, Se, Cu, Fe, and Cd were measured with a 400p-novAA atomic absorption spectrometer (Analytik Jena, Germany).…”

Simultaneous Determination of Gallic Acid and Ascorbic Acid Using First Derivative Zero-Crossing Spectrophotometric Technique

“…It has some pharmacological activities that have been mentioned in the literature such as, anticancer, anti-HIV, anti-inflammatory, antiulcerogenic, antimicrobial, and antifungal (Fernandes and Salgado, 2016). In addition to medicinal aspects, ZANCO Journal of Pure and Applied Sciences 2019 GA has many applications can be applied in other areas, such as it is use as a standard for estimation the total phenolic content in various samples by the Folin-Ciocalteau assay (Abbasi et al, 2011), as a chelating agent in the skin and leather industry (Fernandes and Salgado, 2016). Ascorbic acid (AA) (vitamin C), (Figure 1b), is a water-soluble, unstable antioxidant, easily oxidized acid and can be destroyed by oxygen, alkali and high temperature (Iqbal et al, 2004).…”