Effect of Precipitation in Migration

FIGURE 3.6 Scanning electron microscopic picture of a mica plate immersed in the suspension of a natural clay sediment. Mean lead concentration of the clay is 36 mg/kg. (Reprinted from Nagy et al. 2003a, with permission from Elsevier.) 

Under natural conditions, the thermodynamic conditions are obviously unknown, so the lead enrichment formation mechanism is also unknown. However, the formation of nano- and microparticles containing lead ions under environmental conditions is especially intriguing. At least a portion of lead ions in nature will form similar enrichments. The process, all types of precipitation, can decrease the migration rate of lead ions. If the precipitation of any substance occurs, its migration rate can decrease. 

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