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Figure AF2. Comparison of concentrations of Li, Na+, K+, Rb, Cs, NH4+, Mg2+, Ca2+, Sr, and Ba. 1-A = standard squeezing method using Milli-Q water, 2-A = GRIND method using Milli-Q water spiked with 500 ppb In, 2-B = GRIND method using Milli-Q water spiked with 500 ppb Lu, 3-A1 = leaching method after dried in air at 105°C and using Milli-Q water, 3-A2 = leaching method after dried in vacuum and using Milli-Q water, 3-B1 = leaching method without drying and using Milli-Q water, 3-B2 = leaching method without drying and using 20 µM CH3COONH4 solution, 3-B3 = leaching method without drying using 100 µM CH3COONH4 solution. Error bar = 10% except where noted in the figure.

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