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Unformatted text preview: 0 Universiti Sains Malaysia ENV-O29 LEACHIBILITY STUDIES OF HEAVY METALS FROM ALUM SLUDGE USING DIFFERENT LEACHING ELUENTS *Abdull Rahim Mohd Yusoff and Thanalechumi Paramalinggam Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor E-mail: firstname.lastname@example.org This study focused on leachibility properties of heavy metals (Zn, Cr, Fe, and Ni) from alum sludge using various eluents (double deionized water, 0.1 M acetic acid pH 2.96, 0.1 M hydrochloric acid, 0.1 M ammonium hydroxide pH 9.83 and 0.1 M sodium hydroxide). It was carried out on alkaline pH alum sludge (pH 8 and 10) using Flame Atomic Absorption Spectroscopy (FAAS). The United Kingdom (UK) Leach Test was used as leaching procedure and aluminium sulphate (alum) as the coagulating agent. Results show that, at strong acidic medium (0.1 M HCI), >96 % of all the heavy metals were leached out from the both alum sludge (pH 8 and 10). At weak acidic medium (0.1 M acetic acid), in the range of 840 % of the heavy metals were leached out from both pH medium of alum sludge. Most of the heavy metals were leached out in the range of 0.5 - 38 % except for Fe about >50 % when using strong and weak basic medium (0.1 M NaOH and 0.1 M NH4OH). All the heavy metals were slightly leached out (< 14 %) except for Fe in the range of 30- 69 % when using double deionized water for the both pH medium of alum sludge. As conclusion, the leachibility properties of heavy metals we re depended on the effectiveness of alum and types of leaching eluents. ENV-O30 OPTIMIZATION OF ULTRASONIC-ASSISTED ENZYMATIC DIGESTION CONDITIONS BY USING TWO -LEVEL FACTORIAL DESIGN Yuhanees M. Yusof and Azli B. Sulaiman Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia E-mail: email@example.com Ultrasonic-assisted digestion has been recently proposed as an efficient method for extraction of trace metals from solid matrices. It is an alternative strategy to the conventional sample pre-treatment methods based on dry-, wet-ashing and m...
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