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Waste Management & Research
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Leachate Quality From Iron-Ore Tailings Leached With Deionized Water of Different pH

M.H. Wong

Department of Biology. Hong Kong Baptist College, Kowloon, Hong Kong

S.H. Kwan

Iron-ore tailings filled in a soil column were leached daily with deionized water at various pH 5, 6, 7, 8 and 9) for 50 days. There was a continuous decline in conductivity of all leachates during the study. The final conductivity values of all leachates were significantly lower (P < 0.001) than the initial values. Final pH values were all in the range 8.2-8.3. The lower pH treatments resulted in high leachate concentrations of magnesium, manganese, iron, lead, and zinc. Sodium, potassium and calcium concentrations were similar for all treatments.

Key Words: leachate • iron-ore tailings • Na • K • Ca • Mg • Mn • Fe • Pb • Zn • Hong Kong • ocean pollution.

Waste Management & Research, Vol. 6, No. 1, 45-49 (1988)
DOI: 10.1177/0734242X8800600104
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