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All Journal Heca Journal of Applied Sciences Grimsa Journal of Science Engineering and Technology
Nasrullah Idris
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Health Professions Medicine & Pharmacology Physics

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Assessment of Al3+ Ion Selectivity Coefficient (Kij) in Polyurethane Membranes Derived from Castor Oil (Ricinus communis. L) via Separated Solution Method Firaihanil Jannah; Rinaldi Idroes; Nazaruddin Nazaruddin; Nasrullah Idris; Eka Safitri; Nor Diyana Md Sani
Grimsa Journal of Science Engineering and Technology Vol. 1 No. 2 (2023): December 2023
Publisher : Graha Primera Saintifika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61975/gjset.v1i2.18

Abstract

The influence of foreign ions on the response of Al3+ ISE-based polyurethane membranes from castor oil has been determined using SSM. The results showed that the presence of the foreign ions tested did not affect the sensitivity and response of Al3+ ISE. The influence of foreign ions Na+, K+, Li+, Pb2+, Ca2+, Co2+, Cu2+, Ni2+, Cr3+, and Fe3+ on the selectivity of ion-selective electrodes (Al3+ ISE) in the concentration range 1x10-9 – 1x10-4 M has been performed using separate methods. The results show that the presence of foreign ions does not affect the performance of Al3+ ISE with a Kij value < 1. The selectivity sequence of foreign ions is Fe3+ > Cr3+ > Pb2+ > Cu2+ > Ni2+ > Co2+ > Ca2+ > Li+ > Na+ > K+ respectively.
Electrical Resistivity Tomography for Mapping Landslide-Prone Zones in Pining Subdistrict, Gayo Lues, Aceh, Indonesia Bukhari Ali; Nazli Ismail; Muhammad Surbakti; Nasrullah Idris
Heca Journal of Applied Sciences Vol. 4 No. 2 (2026): September 2026 (In Press)
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/hjas.v4i2.442

Abstract

The interaction of topography, weathering, fracturing, lithological variability, and subsurface moisture controls slope instability in humid tropical terrain. This study maps resistivity heterogeneity and evaluates candidate weak zones on a slope showing evidence of movement in Pining Subdistrict, Gayo Lues Regency, using three intersecting electrical resistivity tomography (ERT) profiles. Data were acquired with a SuperSting R8/IP system using a Wenner-Schlumberger array, 55 electrodes at 6 m spacing, and a 324 m profile length. The apparent-resistivity data were inverted in EarthImager 2D using an L2-norm smooth-model scheme with electrode elevations incorporated into the inversion mesh. Inversion terminated after four iterations for Profiles 1 and 2 and five iterations for Profile 3, with final RMS misfits of 11.62%, 11.41%, and 10.42%, respectively. The inverted resistivity models delineate a near-surface high-resistivity domain (>1000 Ohm.m) overlying intermediate- and low-resistivity domains. Broad spatial correspondence is observed between conductive anomalies S1 and S6, S2 and S7, and S3 and S8 on Profiles 1 and 3, whereas conductive anomaly S5 on Profile 2 is spatially associated with S1 and S6 near the profile intersections. Conductive anomalies S1, S5, and S6 have the strongest cross-profile support. Considering the resistivity distribution, geological setting, field evidence of slope movement, and monthly rainfall context, the principal conductive anomalies are interpreted as intensely weathered, locally fractured, and comparatively moist material. The resistivity-gradient boundary at approximately 10-50 m depth marks a geoelectrical transition and is treated as a candidate weak-zone boundary rather than a confirmed slip surface; hydrogeological and geotechnical validation is required.
Co-Authors Bukhari Ali EKA SAFITRI Firaihanil Jannah Muhammad Surbakti NAZARUDDIN NAZARUDDIN Nazli Ismail Nor Diyana Md Sani Rinaldi Idroes