How does marble’s calcium carbonate affect nearby water pH?

Apr 02,2025

Abstract: Marble, a metamorphic rock composed primarily of calcium carbonate (CaCO₃), plays a significant role in altering the pH of nearby water sources. When marble comes into contact with

Marble, a metamorphic rock composed primarily of calcium carbonate (CaCO₃), plays a significant role in altering the pH of nearby water sources. When marble comes into contact with water, a slow dissolution process occurs, releasing calcium (Ca²⁺) and carbonate (CO₃²⁻) ions into the water. These ions react with hydrogen ions (H⁺), reducing water acidity and increasing its alkalinity.

The carbonate ions act as a natural buffer, stabilizing pH levels by neutralizing excess acidity. This effect is particularly noticeable in regions with limestone or marble bedrock, where water often exhibits a higher pH (7.5–8.5) compared to areas with granite or sandstone. Over time, this process can create alkaline conditions, benefiting aquatic life sensitive to acidic environments.

However, excessive dissolution from erosion or pollution may lead to unnaturally high pH levels, disrupting ecosystems. Understanding marble’s impact helps in managing water quality in both natural and industrial settings.

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