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Shredded rubber from automotive waste tires has been proposed as a potential component for use as a potting root substrate. One of the problems with using shredded rubber as a root substrate is that it releases potentially phytotoxic levels of Zn. Therefore, we were interested in washing the rubber particles with either distilled water, 0.1N HCl, or 0.05N DTPA before inclusion of the rubber in the potting mix. A coarse and a fine grade were used. Seventy-two percent (% w/w) of the particles in the coarse grade were within a particle size range of 2.8-6.3 mm, while only 52% of the particles in the fine grade were within this range. The ratio of extractant to shredded rubber was 2:1 (v/v). The soaking time varied from 1 to 96 hours with the extractant changed every 1, 2, 12, or 24 hours. For either particle size, the 0.1N HCl extractant removed 25 times more Zn than the water and 1.5 times more than the DTPA. With the 0.1N HCl extractant, three times more Zn was removed from the fine rubber as compared with the coarse material. Seventy-five percent of the Zn extracted was removed in the first hour of soaking and 92% removed within 72 hours.

128 Release of Zinc from Shredded Waste Tires Designed for Use as a Substrate Amendment