Clay bricks - ScienceDirect
2019-1-1 · Old clay bricks contain, typically, calcium (Ca 2+), sodium (Na +), potassium (K +), magnesium, and iron sulfates that come from impurities and the constituents of raw clay, water, and from lime mortars, while the contamination by chlorides and nitrates comes generally from the subsoil (Watt and Swallow, 1996).
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