Using Acid-washing Leachates of Ground Tire Rubber and its Ash as a Zinc Source for Hydroponics-grown Tomato

摘要

Waste ground tire rubber and its ash were washed using different ratios of HNO3, H2SO4, and H20 and the resultant solutions were analyzed for Zn, Pb, Cd, Fe. The extracted solution with the highest Zn content was then used as a source of Zn for hydro-ponics-grown tomato. The highest recovery of Zn from rubber and its ash was obtained using 4 M HNO3. Two levels of Zn supplied by the ash leachate increased the plant Zn concentration compared with the control. The results showed the possibility of using acid-washing leachate of ground tire rubber and its ash as a suitable Zn source in hydroponics solutions.