Electronic Theses and Dissertation

Telah dilakukan penelitian mengenai kandungan logam berat timbal (Pb) pada sedimen dan keong Neritina variegata di Pelabuhan Perikanan Meureudu, Kecamatan Meureudu, Kabupaten Pidie Jaya. Penelitian ini bertujuan untuk mengetahui kandungan timbal dalam sedimen dan jaringan keong serta hubungannya dengan karakteristik sedimen dan morfometri keong. Sampel diambil dari tiga stasiun berbeda pada Februari 2025 menggunakan metode purposive sampling dengan alat pipa paralon sepanjang 10 cm dan diameter 2,5 inci. Analisis kandungan timbal dilakukan menggunakan instrumen Atomic Absorption Spectrophotometer (AAS) di Laboratorium Lingkungan, Fakultas Teknik, Universitas Syiah Kuala. Hasil penelitian menunjukkan kandungan timbal pada sedimen berkisar antara 0,422–1,088 mg/kg, masih berada di bawah ambang batas US-EPA (2004) sebesar 47,58 mg/kg, sehingga tergolong belum mencemari sedimen. Kandungan timbal dalam jaringan keong berkisar antara 0,044–0,751 mg/kg, juga masih di bawah ambang batas SNI 7387:2009 untuk hasil laut yang aman dikonsumsi sebesar 1,5 mg/kg berat basah. Meskipun demikian, hasil ini menunjukkan bahwa N. variegata tetap mampu mengakumulasi logam berat dari lingkungan. Analisis tekstur sedimen menunjukkan dominasi pasir halus pada Stasiun 1 dan 3, serta pasir kasar di Stasiun 2, yang memengaruhi kemampuan pengikatan logam berat. Morfometri keong bervariasi antar stasiun, dengan Stasiun 3 memiliki ukuran keong terbesar, sedangkan Stasiun 2 menunjukkan ukuran lebih kecil dan seragam. Variasi ukuran ini berkorelasi dengan karakteristik sedimen dan kandungan timbal di masing-masing lokasi.

Kata Kunci : Kadar logam, atomic absorption spectrophotometer (AAS), sedimen, keong, timbal.

A study has been conducted on the content of heavy metal lead (Pb) in sediment and snails Neritina variegata in Meureudu Fishery Port, Meureudu District, Pidie Jaya Regency. This study aims to determine the lead content in sediment and snail tissue and meet the characteristics of sediment and snail morphometry. Samples were taken from three different stations in February 2025 using a purposive sampling method with a 10 cm long and 2.5 inch diameter PVC pipe tool. Analysis of lead content was carried out using an Atomic Absorption Spectrophotometer (AAS) instrument at the Environmental Laboratory, Faculty of Engineering, Syiah Kuala University. The results showed that the lead content in the sediment ranged from 0.422–1.088 mg/kg, still below the US-EPA (2004) threshold of 47.58 mg/kg, so it is classified as not polluting the sediment. Lead content in snail tissue ranged from 0.044–0.751 mg/kg, also still below the SNI 7387:2009 threshold for safe seafood consumption of 1.5 mg/kg wet weight. Nevertheless, these results indicate that N. variegata is still able to accumulate heavy metals from the environment. Sediment analysis showed a predominance of fine sand at Stations 1 and 3, and coarse sand at Station 2, which affects the ability to bind heavy metals. Snail morphometry varied between stations, with Station 3 having the largest snail size, while Station 2 showed smaller and more uniform sizes. This size variation persisted with the characteristics of the sediment and lead content at each location. Keywords : metal content, atomic absorption spectrophotometer (AAS), sediment, snails, lead.