Montmorillonite atomic percent

It can be shown that the quantity of lead ions in montmorillonite in atomic percent is equal to the quantity of calcium ions in calcium-montmorillonite (Table 2.14). Since the quantity of calcium ions is equal to the CEC, it means total cation exchange. [Pg.150]

The Composition of Montmorillonites in Atomic Percent and the Selectivity Coefficient of Calcium-Lead Cation Exchange... [Pg.152]

In Tables 2.14 and 2.15, the average compositions of calcium-, lead-, and calci-um-lead-montmorillonite are listed as atomic percent. (The data were determined by energy-dispersive x-ray spectroscopy, which cannot determine hydrogen content. Note that the hydrogen content is not indicated.)... [Pg.155]

In the first row of Table 2.14, the average composition of calcium-montmoril-lonite is given. In the second row, the mean composition of lead-montmorillonite, where lead concentration is even (no enrichments), is provided. The atomic percent of lead in lead-montmorillonite is about equal, within the experimental error of 5% to 10%, of the atomic percent of calcium in calcium-montmorillonite. Since the interlayer cation of the original montmorillonite is calcium ion, lead ions can completely exchange calcium ions. [Pg.155]

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