The roots of plants were washed in sterile distilled water, separated into shoots and roots, and dried for 3 days at 50°C. Dried samples were digested in HNO3 (concentrated) at 80°C overnight. After filtration, acid solutions were diluted with 1% HNO3. K+ concentrations in the solution were determined by ICP-OES (Agilent Technology 5800). Cs+ and Rb+ were determined by ICP-MS (OPTIMA 8300, Perkin Elmer).
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