Ultra‐Trace Silver Determination in Biological and Water Samples by Electrothermal Atomic Absorption Spectrometry after Electrodeposition on a Graphite Probe

Abstract

A rapid and simple procedure was developed for selective and sensitive determination of ultra-trace silver in biological and environmental samples using the electrodeposition on a graphite probe modified with palladium followed by electrothermal atomic absorption spectrometry. Several experimental parameters for the electrodeposition, such as deposition potential, electrolyte concentration, pH of solution and deposition time were optimized. The calibration graph after preconcentration was linear in the range of 10-250 ngL -1 with correlation coefficient of 0.9989 under the optimum conditions for procedure. The limits of detection (LOD) and quantification (LOQ) base on (3s) and (10s) were 2.8 ngL -1 and 9.4 ngL -1 respectively. Related standard deviation (RSD) for eight replicate measurements of 100 ngL -1 silver was 4.3%. Samples were digested completely in a closed microwave digestion system using only perchloric acid, and interference owing to various cations was also investigated. The proposed procedure was successfully applied to determine silver in blood, urine and some environmental samples with satisfactory analytical results.

Atomic spectrometry update: Review of advances in the analysis of clinical and biological materials, foods and beverages

“…Moradkhani et al 125 described a sensitive method for the quantitative determination of Ag in biological matrices using ETAAS aer electro-deposition of Ag on a palladium-modied graphite tube. The authors investigated optimal parameters for electro-deposition including deposition potential, deposition time and solution pH.…”

Trace-level Lead Analysis in Environmental Water and Whitening Cosmetics Based on Solid-Phase Extraction Followed by Flame Atomic Absorption Spectrometry Determination

“…A separation and preconcentration step is usually necessary prior to the determination of Pb due to the low levels and the complex matrix. Many preconcentration techniques have been reported, including ion exchange (5), coprecipitation (6), electrodeposition (7), membrane filtration (8), flotation (9), dispersive liquid-liquid microextraction (10), cloud point extraction (11), and solid phase extraction (SPE) (12,13). Among these techniques, SPE has been frequently used for pharmaceutical (14), fine chemicals (15), biological medicine (16), and environmental analysis (12,13) due to its simplic-proved to be especially effective as a result of its high mechanical property, numerous active sites, large surface area, strong adsorption ability, and stability (17).…”