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Abstract

Black tea is one of the most popular beverages in Iraqi society. The estimation of heavy metals is a critical test due to their direct impact on human health. The preparation method of the samples is regarded as one of the most important factors influencing measurement accuracy in spectrophotometric inspections. The current study was conducted to estimate the concentrations of the elements iron (Fe), copper (Cu), cadmium (Cd), and tin (Sn) using an atomic absorption spectrophotometer flame technology, after employing the dry ash method (D) by comparing three different additions D1, D2, and D3, and the microwave digestion method (M) using two different additions M1and M2. The results were analyzed statistically within the probability level of (P≤0.05), significant differences were found between D3 modified method which was better compared to D1, and D2 for the D method in concentrations of 3.734, 0.0601, -0.0364, and -2.801mg/kg. The M1 performed better than the M2 method for the M method, with 3.894, 0.1991, 0.0137, and -0.0186 mg/kg for Fe, Cu, Cd, and Sn respectively. D3 compared with M1, it was found that M1 was better at concentration recovery percentage than D3. In conclusion, the best method for digesting black tea samples is the microwave digestion method, as it is more efficient, accurate, and faster than the dry ash method.

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