Jenis-jenis Lumut (Bryophyte) dan Analisis Kemampuan Penyerapan Logam Timbal (Pb) di Kampus Universitas Sumatera Utara

Abstract

Universitas Sumatera Utara (USU), located in the center of Medan City, serves as a center for educational activities, making it a place that has a quite high volume of motor vehicle traffic, which contributes to the risk of heavy metal pollution, particularly lead (Pb). Although studies on epiphytic moss species have been conducted in the USU area, but the full diversity and the specific species' ability to absorb Pb have not been comprehensively identified. This study aimed to identify the moss species found within the Universitas Sumatera Utara campus and to analyze their capacity to absorb lead (Pb). The research was conducted from November 2024 to May 2025 using an exploratory method at 19 sampling locations. Lead content in moss samples was analyzed using Atomic Absorption Spectrophotometry (AAS) at the Medan Industrial Standardization and Services Center Laboratory. The results identified 23 moss species classified into three divisions: Marchantiophyta (% families, 11 genera, 13 species), Bryophyta (5 families, 7 genera, 9 species), and Anthocerotophyta (1 species). The species with the highest Pb absorption capacity was Isopterygium minutirameum (37,1 mg/kg), while the lowest was Octoblepharum albidum (4,53 mg/kg).