Samples for ICP-AES study were prepared using an acid digestion method. Concentrated sulfuric acid (1 ml) was added to a weighed sample in a sample tube, which was then placed in an aluminum heating block at 200°C. Subsequently, 3 ml of concentrated nitric acid was added and the mixture was kept at 200°C until the sample was digested completely. The resulting solution was transferred in a 50-ml volumetric flask and diluted with water. Diluted zinc standard solutions with 2% (v/v) sulfuric acid were also prepared for calibration. ICP-AES measurements were performed on Shimadzu ICPS-7510 equipment.

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