Assessment of Arsenic and Mercury Contamination in Water and Sediments Around the Jaboi Sabang Geothermal Area Using ICP-OES

Fazri Baziahni; Rinaldi Idroes; Lelifajri Lelifajri

doi:10.60084/ljes.v4i2.441

Authors

Fazri Baziahni Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
Rinaldi Idroes Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia; Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
Leli Fajri Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia

DOI:

https://doi.org/10.60084/ljes.v4i2.441

Keywords:

Geothermal manifestation, Heavy metal contamination, Inductively Coupled Plasma, Environmental monitoring, Water and sediment analysis

Abstract

The Jaboi Sabang Geothermal Area in Aceh, Indonesia, comprises four active craters that release geothermal fluids and gases into surrounding water sources used by local communities for daily activities. Despite the known toxicity of arsenic (As) and mercury (Hg) in geothermal environments, baseline data on their occurrence and distribution in local water and sediment remain limited. This study assessed As and Hg contamination in water and sediment samples using Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES). Water samples were collected from hot springs, bathing pools, rivers, boreholes, dug wells, and treated water, while sediment samples were obtained from craters and stream beds. Method validation showed good linearity (R² > 0.99), with limits of detection (LoD) of 10.49 µg/L for As and 1.98 µg/L for Hg, and acceptable recovery values (70–125%). The highest As and Hg instrument responses in water were observed in hot-spring sample J1, at 11.268 and 6.861 µg/L, respectively. However, the As result for J1 was above the LoD but below the limit of quantification (LoQ), indicating detection without reliable quantification, while As in J2–J7 was below the LoD. For Hg, only J1 exceeded the LoQ, whereas J3 and J6 produced responses between the LoD and LoQ. The remaining samples were below the Hg LoD. Because the applicable Hg benchmark was lower than the method LoD, compliance could not be established for samples other than J1. These findings highlight the need for improved analytical sensitivity and continued monitoring to assess potential environmental and public health risks.

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