Abstract
The concentrations of sodium, potassium, magnesium, calcium, chloride, phosphate, sulphate, formate and acetate ions in infusions at 80°C of sieved German rose-hip tea have been measured by ion chromatography. From the equilibrium concentrations of the infusion the ionic contents of the rose-hip tea were evaluated and compared with sparse and contradictory information in the literature. The main species present was found to be potassium, followed by calcium. From the rates of increase of the ionic concentrations with time, first order rate constants of infusion were determined and interpreted in terms of slow diffusion of the ions through the rose-hip particles. The resulting internal diffusion coefficients were found to be 30–80 times smaller than the corresponding diffusion coefficients of the ions in water at 80°C.
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