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Figure AF5. Comparison of concentrations of Li, Na⁺, K⁺, Rb, Cs, NH₄⁺, Mg²⁺, Ca²⁺, Sr, and Ba. 1-B = standard squeezing method using Milli-Q water, 2-C = GRIND method using Milli-Q water, 2-D = GRIND method using 100 µM CH₃COONH₄ solution, 2-E = GRIND method using diluted HNO₃ solution with pH adjusted to 3, 2-F = GRIND method using diluted HNO₃ solution with pH adjusted to 5. Error bar = 10% except where noted in the figure.

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