The exchangeable sodium ratio (ESR) can be calculated as ESR = Exchangeable (C2+ + Mg2+)/Exchangeable Na+ ESR = Exchangeable Na+ / ESR = Exchangeable Na+ / Exchangeable (Ca2+ + K+) ESR = Exchangeable Na+ / Exchangeable (Ca2+ + Mg2+)

The exchangeable sodium ratio (ESR) can be calculated as
ESR = Exchangeable (C2+ + Mg2+)/Exchangeable Na+
ESR = Exchangeable Na+ /
ESR = Exchangeable Na+ / Exchangeable (Ca2+ + K+)
ESR = Exchangeable Na+ / Exchangeable (Ca2+ + Mg2+)
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ESR = Exchangeable Na+ / Exchangeable (Ca2+ + Mg2+)
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