<![CDATA[This study aims to evaluate the adsorption efficiency of Fe, Mn, and Pb metals in peat water using activated natural zeolite as an adsorbent and to assess the performance of the ICP-OES instrument. Peat water samples were collected from Banjar Regency with characteristics of pH 5.13, Fe concentration 3.141 mg/L, Mn 0.164 mg/L, and Pb 0.080 mg/L. The adsorption process was carried out in a batch system with variations in adsorbent mass (0.3–1.5 g per 100 mL) and contact time (15–60 minutes). Zeolite was activated using 1 N HCl and heated at 300°C. Metal concentration analysis was performed using ICP-OES. The results showed that the optimum condition was achieved at 1.5 g adsorbent mass (Fe at 45 minutes; Mn at 60 minutes), with the highest removal efficiency of 92.68% for Mn and 71.86% for Fe. The adsorption isotherm model for Mn followed the Freundlich model (R² = 0.9324), while Fe approached the Langmuir model with some anomalies. The ICP-OES instrument demonstrated excellent linearity with R² values close to 1.0000. This study proves that activated natural zeolite is effective in reducing heavy metal concentrations in peat water, particularly Mn and Fe.]]>
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