Reduction of Offensive Odor from Natural Rubber Using Zinc-Modified Bentonite

Table 1

Composition of natural bentonite and zinc-modified bentonite by XRF analyses.

Analyte (wt.%)	Natural bentonite	Zinc bentonite	Zinc bentonite (Zn- and S-free)
Si	46.0	31.5	53.8
Fe	25.7	14.5	24.8
Al	8.74	—	—
K	1.32	0.81	1.38
Ti	1.42	0.77	1.32
Ca	15.5	9.89	16.9
Zn	0.05	32.3	—
Cu	0.08	0.07	0.12
Sr	0.24	0.17	0.29
Mn	0.85	0.48	0.82
Zr	0.08	—	—
V	0.06	—	—
S	—	9.19	—
Ba	—	0.36	0.61