Simultaneous determination of trace metals in soil samples by inductive coupling plasma atomic emission spectrometry (ICP-OES)
Abstract
Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-OES) is a highly sensitive analytical technique for the identification and quantification of different elements of the periodic table. In this context, the present work aims to quantify several metals: Zn, Mn, Pb and Co in three types of soil samples using this analytical technique. The calibration curves obtained for each metal show great linearity with values of the coefficient of determination (r2) above 0,997. The validation of the analytical method was carried out by using certified reference materials for each metal, obtaining recovery percentages very close to 100%, which is very optimal and sensible for the simultaneous quantification of different metals in soil samples of unknown concentration at levels. trace and ultra-trace, also reducing analysis times, less analyst intervention and sample consumption compared to other less sensitive spectrometric techniques such as UV-VIS spectrophotometry. The concentrations obtained of each metal in the analyzed soil samples are below the generic reference levels (NGR), which shows that these soils are suitable for cultivation, since they present different types of micronutrients that provide great advantages to the plant growth. Finally, a one-factor ANOVA statistical treatment was performed to check if there are significant differences between the three soil samples analyzed; the results obtained indicate that they are statistically different (p <0,05).
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Copyright (c) 2021 Diego Barzallo , Humberto Vera , César Gavin , Rafael Lazo
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