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Abstrak (Bhs. Indonesia)

Daerah Aliran Sungai (DAS) Serayu merupakan DAS prioritas di Jawa Tengah 
yang berperan penting sebagai sumber air untuk irigasi, perikanan, pembangkit 
listrik, dan kebutuhan domestik. Aktivitas antropogenik di sepanjang DAS 
berpotensi memengaruhi keberadaan logam berat pada sedimen. Penelitian ini 
bertujuan menentukan konsentrasi logam berat Pb, Cr, Cd, dan Mn pada 
sedimen DAS Serayu serta mengevaluasi potensi risiko ekologisnya 
menggunakan Sediment Quality Guidelines (SQGs), Enrichment Factor (EF), 
Contamination Factor (CF), Index of Geoaccumulation (Igeo), dan Potential Ecological 
Risk Index (PERI). Sampel sedimen diambil pada sembilan stasiun menggunakan 
metode purposive sampling dan dianalisis menggunakan Atomic Absorption 
Spectrophotometry (AAS). Hasil penelitian menunjukkan bahwa Mn memiliki 
konsentrasi tertinggi (1.122,9 ± 526 mg/kg), diikuti Cr (3,076 ± 5,08 mg/kg), 
sedangkan Pb (0,015 ± 0,000 mg/kg) dan Cd (0,002 ± 0,000 mg/kg) berada di 
bawah batas deteksi. Nilai SQGs (<0,1) menunjukkan kualitas sedimen masih 
baik. Nilai EF menunjukkan Pb, Cr, dan Cd tidak mengalami pengayaan (EF < 
1), sedangkan Mn termasuk pengayaan rendah (1 ≤ EF < 3). Nilai CF 
menunjukkan Pb, Cr, dan Cd termasuk kontaminasi rendah (CF < 1), sedangkan 
Mn termasuk kontaminasi tinggi (CF ≥ 6). Nilai Igeo menunjukkan Pb, Cr, dan 
Cd tidak terkontaminasi (Igeo ≤ 0), sedangkan Mn tidak terkontaminasi hingga 
terkontaminasi sedang (0 < Igeo < 1). Nilai PERI termasuk kategori risiko 
ekologis rendah (PERI < 150). Secara keseluruhan, sedimen DAS Serayu masih 
memiliki kualitas yang baik dengan potensi risiko ekologis rendah, meskipun 
Mn menunjukkan indikasi awal akumulasi dibandingkan logam lainnya.

Abtrak (Bhs. Inggris)

The Serayu River Basin (DAS) is a priority watershed in Central Java that plays a 
vital role as a water source for irrigation, fisheries, power generation, and 
domestic needs. Anthropogenic activities along the watershed have the potential 
to affect the presence of heavy metals in sediments. This study aims to determine 
the concentrations of the heavy metals Pb, Cr, Cd, and Mn in sediments of the 
Serayu Watershed and to evaluate their potential ecological risks using Sediment 
Quality Guidelines (SQGs), Enrichment Factor (EF), Contamination Factor (CF), 
Index of Geoaccumulation (Igeo), and Potential Ecological Risk Index (PERI). 
Sediment samples were collected at nine stations using purposive sampling and 
analyzed via Atomic Absorption Spectrophotometry (AAS). The results showed 
that Mn had the highest concentration (1,122.9 ± 526 mg/kg), followed by Cr 
(3,076 ± 5.08 mg/kg), while Pb (0.015 ± 0.000 mg/kg) and Cd (0.002 ± 0.000 
mg/kg) were below the detection limit. SQG values (<0.1) indicate that sediment 
quality is still good. EF values indicate that Pb, Cr, and Cd are not enriched (EF 
< 1), while Mn is classified as having low enrichment (1 ≤ EF < 3). CF values 
indicate that Pb, Cr, and Cd are classified as having low contamination (CF < 1), 
while Mn is classified as having high contamination (CF ≥ 6). Igeo values indicate 
that Pb, Cr, and Cd are uncontaminated (Igeo ≤ 0), while Mn ranges from 
uncontaminated to moderately contaminated (0 < Igeo < 1). PERI values fall into 
the low ecological risk category (PERI < 150). Overall, the sediments in the Serayu 
Watershed still have good quality with a low potential for ecological risk, 
although Mn shows early indications of accumulation compared to other metals.

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