Comparison of Metal Content of Coffee Samples Grown in Different Countries by Inductively Coupled Plasma Optical Emission Spectroscopy

Abstract

Coffee is the one of the most consumed beverage across the world. Therefore, it has a commercial value and social importance. Coffee consumption continues to increase due to its physiological effects, its pleasant taste, aroma and many health benefits. In this study six different coffee samples from six different countries were analyzed for determining concentration of 17 elements by using inductively coupled plasma optical emission spectroscopy (ICP-OES). According to the obtained results, elements were classified into three groups of macro, micro, and trace elements according to their concentration; among the macro elements potassium concentration were highest (10508 mg/L) average concentration in all samples; whereas the average concentration of calcium were found to be lowest (296.33 mg/L) in this group. Micro elements showed the concentration order of: Sr > Mn > Fe > Al > Ba > Cu > Zn by concentration of 12.66, 12.28, 6.35, 3.81, 3.79, 3.05, and 2.61 mg/L respectively. Concentrations of selenium were higher than all other elements in the group of trace elements by average concentration of 0.61 mg/L. The results obtained in this study showed there are significant differences between different elemental content of different coffee samples grown in different region.

Keywords

• Coffee,Trace element,analysis,coffee sample,elements,Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES)

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