how does rainwater contain
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Rainwater is a mixed electrolyte that contains varying amounts of major and minor ions. Sodium, potassium, magnesium, calcium, chloride, bicarbonate, and sulfate ions are major constituents, to- gether with ammonia, nitrate, nitrite, nitrogen, and other nitroge- nous compounds (Hutchinson, 1957).
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Rainwater is slightly acidic and very low in dissolved minerals; as such, it is relatively aggressive. ... Rainwater lacks minerals, but some minerals, such as calcium, magnesium, iron and fluoride, in appropriate concentrations are considered very essential for health
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