Fig. 4. Effect of contact time on the removal of nitrite ions (from 40 mg/L solution) by a) ZnCl2/450-AC and b) CAC. Measurements were made using 0.25 mg solid/50 mL solution and initial pH 4, at 30 C.
Fig. 4. Effect of contact time on the removal of nitrite ions (from 40 mg/L solution) bya) ZnCl2/450-AC and b) CAC. Measurements were made using 0.25 mg solid/50 mLsolution and initial pH 4, at 30 C.