Analit : Analytical and Environmental Chemistry

METHYLENE BLUE DYE REMOVAL BY ADSORPTION ONTO NATURAL GAMALAMA VOLCANIC SOIL

Sun, 30 Mar 2025 00:00:00 +0000

The adsorption of Methylene Blue (MB) dye from aqueous solutions using natural adsorbents derived from Gamalama volcanic soil was investigated in this study. The adsorbent materials were characterized by FTIR, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) analyses, confirming the presence of allophane, halloysite, and kaolinite, which exhibit different morphologies and surface properties. Batch adsorption experiments were conducted to evaluate the effects of pH, contact time, and adsorbent mass on the removal efficiency of Methylene Blue. The results demonstrated that Gamalama volcanic soil adsorbents have a high affinity for Methylene Blue, achieving significant removal rates under optimal conditions. The findings suggest that Gamalama volcanic soil is a promising, low-cost, and environmentally friendly adsorbent for treating dye-contaminated wastewater. This study highlights the potential application of natural volcanic soil as an effective adsorbent in environmental remediation. The optimum MB removal was performed by adsorption condition with pH 6, 20 minutes contact time and 30 mg adsorbent.

EFFECTIVENESS OF USING ACTIVATED CARBON TO REDUCE POLLUTANTS IN LEACHATE

Tue, 29 Jul 2025 00:00:00 +0000

Leachate pollution resulting from dissolution process organic and inorganic materials in open landfills is a serious environmental problem. Leachate contains various pollutants, such as heavy metals, organic compounds, and hazardous compounds that can damage water and soil quality not managed properly. This study aims assess the effectiveness activated carbon in reducing pollutants in leachate and factors that affect the performance of activated carbon in leachate treatment. The method used in study is leachate treatment using activated carbon as an adsorbent medium. Testing was carried out with variations in contact time and activated carbon concentration to determine the optimal conditions for pollutant absorption. Water quality parameters tested included COD, BOD, Fe and Zn. The results of study showed that activated carbon is very effective in reducing pollutant content in leachate. This can be seen from results of the effectiveness calculation where it was found that activated carbon can reduce COD 63.96%, BOD 44.89%, Fe 83.33%, and Zn 83.33%.

Analysis of the Physical and Chemical Properties as well as Metal Content of Hot Spring Water Sources in Lampung

Mon, 11 Aug 2025 00:00:00 +0000

Hot springs can be explored for geotourism activities. Geotourism is part of the main field in geology that can contribute to sustainable development. Therefore, hot springs are explored to determine their potential based on their physical and chemical properties. There were three places studied, namely Way Sulfur Kalianda baths, hot springs in Natar, and hot springs in Banjit, Way Kanan. The physical and chemical properties of hot springs measured in situ include total dissolved solids, dissolved oxygen, pH and temperature, while total metal concentrations are determined using ICP-AES. The measured pH value ranged from 5.2-8.1, the average measured temperature ranged from 37-52 °C. The highest and lowest DO values were 9.1 mg/L and 5.5 mg/L respectively. The average TDS and TSS values at the three sample locations were 3620 mg/L and 16.7 mg/L respectively. The highest concentrations of the metals Al, Ba, Cu, K, Ni, Pb are found in Natar, South Lampung, while the highest concentrations of B, Co, Li, Na are in Way Kanan, North Lampung. The highest concentrations of Mg, Mn, Ca are found in Way Sulfur, Kalianda, South Lampung. Concentrations of other metals were generally low and similar at the hot spring sample points studied. With the high content of harmless minerals in hot springs, hot springs can be explored for geotourism activities.

ASSESSMENT OF BENGAWAN SOLO RIVER RAW WATER QUALITY USING THE POLLUTION INDEX

Intan Ayu Pebiola, Heri Mulyanti, Laily Agustina Rahmawati — Tue, 22 Jul 2025 00:00:00 +0000

The Bengawan Solo River is a primary water resource in Central and East Java. Human activities along the Watershed (DAS) have affected water quality. This study evaluates the water quality of the Bengawan Solo River during the dry and rainy seasons from 2019 to 2023 using the Pollution Index (IP) method, based on secondary data from Perum Jasa Tirta I at four locations: upstream, middle, downstream 1, and downstream 2. The analyzed parameters include physical (temperature, TDS, TSS), chemical (pH, DO, BOD, nitrate), and biological (Total coliform) aspects. The results indicate that pH, TDS, and nitrate remain within quality standards, whereas temperature, BOD, DO, and TSS often exceed the limits, especially during the rainy season. The Pollution Index (Pij) suggests better water quality in the dry season, predominantly classified as "Lightly Polluted." However, in the 2021 rainy season, two locations reached the "Moderately Polluted" category, indicating that rainfall contributes to increased pollution.