A Straightforward Method for Copper Determination in Fish Samples via Direct Solid Sample Analysis Line-Source GFAAS

This manuscript describes a simple and reliable method for direct solid sample analysis applied for Cu determination in powdered fish samples using line-source graphite furnace atomic absorption spectrometry. Direct solid sample analysis was performed using a laboratory-made device based on glass capillary tubes for sample mass measurement and transportation to the graphite furnace. The pyrolysis and atomization temperatures were optimized; the optimum conditions were achieved at 1100 °C (pyrolysis) and 2400 °C (atomization). External calibration against aqueous solutions proved to be a reliable alternative for Cu quantification in fish samples with good accuracy. The detection and quantification limits for Cu determination in fish tissues were 0.04 ng g^-1 and 0.12 ng g^-1, respectively. The proposed method revealed good sensitivity while being simple and reliable.