Simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation process by GFAAS

Abstract

A method has been developed for the simultaneous determination of Cd and Pb in antibiotics used in sugar-cane fermentation by GFAAS. The integrated platform of transversely heated graphite atomizer was treated with tungsten to form a coating of tungsten carbide. Six samples of commercial solid antibiotics were analyzed by injecting 20 µL of digested samples into the pretreated graphite platform with co-injection of 5 µL of 1000 mg L-1 Pd as chemical modifier. Samples were mineralized in a closed-vessel microwave-assisted acid-digestion system using nitric acid plus hydrogen peroxide. The pyrolysis and atomization temperatures of the heating program of the atomizer were selected as 600°C and 2200°C, respectively. The calculated characteristic mass for Cd and Pb was 1.6 pg and 42 pg, respectively. Limits of detection (LOD) based on integrated absorbance were 0.02 µg L-1 Cd and 0.7 µg L-1 Pb and the relative standard deviations (n = 10) for Cd and Pb were 5.7% and 8.0%, respectively. The recoveries of Cd and Pb added to the digested samples varied from 91% to 125% (Cd) and 80% to 112% (Pb).

Cadmium determination in Lentinus edodes mushroom species

“…This is a suitable and widely used technique for determining trace elements due to its high selectivity, sensitivity, and ability to directly determine several analytes in different samples (AMORIM FILHO et al, 2006).…”

Evaluation of Lines of Phosphorus and Potassium by High-Resolution Continuum Source Flame Atomic Absorption Spectrometry for Liquid Fertilizer Analysis

“…Since these samples are completely soluble in water, they were diluted 1:200 (w/v) in deionized water before analysis. A fertilizer reference material (NIST 120c -Phosphate Rock, National Institute of Standards and Technology, Gaithersburg, MD, USA) was digested in a closed microwave system with pressure and temperature control according to a procedure described in the literature (12).…”

Multi-Element Determination of Cu, Mn, and Se using Electrothermal Atomic Absorption Spectrometry

“…Number of multi-element Atomic Absorption spectrometers has been developed [4,5]. Presently, the most widely used instrument is a line source simultaneous spectrometer, equipped with transversely heated graphite atomizer, THGA with integrated platform, Zeeman Effect background corrector and solid-state detector [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. However, multi-element determinations carried out by SIMAAS need the adoption of compromised conditions, which can affect the sensitivity and the precision of analytical results [21,22].…”