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To prepare the suspension, 2.0 ml of distilled water, an internal Ga standard with a final concentration in the dry residue of 100 mg/kg, was added to 20 mg of pre‐dried (at 85 °C for four hours) and overloaded tea leaves in the agate mortar, and mixed thoroughly. Next, 10 μl of suspension was applied to a quartz substrate, dried, and measured for five hundred seconds.