Rainwater, river water, and seawater have distinctive dissolved ion signatures: rainwater has very low total dissolved solids across all major ions; river (fresh) water is typically dominated by bicarbonate (HCO3-) from chemical weathering of silicate/carbonate rocks; and seawater is dominated by chloride and sodium with comparatively very low bicarbonate, reflecting its long-term evaporative concentration and marine geochemical buffering.
Comparing the relative ion abundance patterns: Sample A shows uniformly low concentrations (mg/L in the single digits) across Na, Cl, and HCO3, consistent with the...
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