Selectivity of Na-Montmorillonite versus Concentration of Two Competitive Bivalent Cations (Cu²⁺, Pb²⁺): Quantitative XRD Investigation

Table 1

d₀₀₁ and FWHM of the 001 reflection are given respectively in Å and in °2θ-CuK𝛼. The 𝜉 parameter is calculated as the standard deviation of the lx (00l) values calculated for the Xi measurable reflections over the 2–35°2θ CuK𝛼 angular range.

Normality	d001	FWHM	𝜉 (Å)	Character
10^-2N	12.53	0.984	0.88	Interstratified
10^-3N	12.40	0.418	0.20	Homogeneous
10^-4N	12.36	0.413	0.11	Homogeneous