GUNAWAN, FARID (2023) HUBUNGAN KANDUNGAN LOGAM BERAT TIMBAL (Pb) TERHADAP FRAKSI SEDIMEN DAN BAHAN ORGANIK DI KAWASAN SUNGAI SILANDAK DAN PANTAI TIRANG, SEMARANG (23dik367). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Farid Gunawan. 260 401 181 301 51. Hubungan Kandungan Logam Berat Timbal (Pb) terhadap Fraksi Sedimen dan Bahan Organik di Kawasan Sungai Silandak dan Pantai Tirang, Semarang. Adi Santoso dan Chrisna Adhi Suryono).
Wilayah kawasan Pantai Tirang, Kota Semarang bersebelahan dengan muara Sungai Silandak yang daerah hulunya merupakan Kawasan Industri Candi (KIC) dan wilayah padat penduduk yang memiliki beragam aktivitas rumah tangga menyebabkan logam berat Timbal (Pb) mencemari wilayah kawasan Pantai Tirang dan Sungai Silandak dapat mengendap pada sedimen di wilayah tersebut. Persebaran pencemaran logam berat Pb dalam sedimen diketahui memiliki beberapa faktor seperti tipe fraksi sedimen tersebut dan bahan organik yang terkandung di dalamnya. Penelitian ini bertujuan untuk meninjau hubungan antara pencemaran Pb dengan tipe fraksi sedimen dan bahan organik dalam sedimen di perairan Sungai Silandak dan Pantai Tirang, Semarang. Penentuan lokasi pengamatan dilakukan dengan metode purposive sampling. Sampel berupa air dan sedimen yang diambil sebanyak 3 kali di setiap stasiun penelitian. Sampel dianalisis di Laboratorium Teknik Lingkungan, Universitas Diponegoro menggunakan alat Atomic Absorption Spectrophotometer (AAS) untuk menentukan kadar logam Pb dan pengabuan sedimen untuk kandungan bahan organik. Ukuran butir sedimen diklasifikasi menggunakan metode ayakan dan hydrometer di Laboratorium Mekanika Tanah, Universitas Diponegoro. Regresi linear sederhana dan korelasi pearson digunakan untuk menentukan tingkat hubungan Pb dengan fraksi sedimen dan bahan organik. Kadar Pb didapatkan hasil 0,111 – 0,498 mg/l pada air dan 2,19 – 23,46 mg/kg pada sedimen. Ukuran butir sedimen didominasi oleh pasir. Kandungan bahan organik berkisar antara 2,321 – 11,893%. Korelasi pearson (r) didapatkan nilai positif tinggi antara Pb dengan butiran sedimen yang lebih halus (lanau dan lempung) dan bahan organik. Nilai korelasi negatif tinggi didapatkan antara Pb dengan butiran sedimen yang lebih kasar (pasir).
Kata kunci: Timbal, Sedimen, Bahan Organik.

ABSTRACT
(Farid Gunawan. 260 401 181 301 51. The Correlation of Heavy Metal Lead (Pb) with Sediment Fractions and Organic Materials in Silandak River and Tirang Beach, Semarang. Adi Santoso and Chrisna Adhi Suryono).
Tirang Beach, Semarang City is located next to Silandak River with Candi Industrial Area (KIC) at the upstream. Dense population activities in the area are causing lead (Pb) contamination in Tirang Beach waters and settled in its sediment. Lead (Pb) contamination distribution is affected by several factors such as type of sediment fraction and the organic matter contained. The purpose of this research is to examine the correlation between Pb pollution with the type of sediment fraction and its organic matters from the waters of Silandak River and Tirang Beach, Semarang. Sampling site location is determined by purposive sampling method. Water and sediment samples are taken in each sampling station with three times repetition. Samples were then analysed at the Environmental Engineering Laboratory, Diponegoro University using Atomic Absorption Spectrophotometer (AAS) to determine lead (Pb) levels and sediments ashing to determine its organic matter. Sediment grain size was classified using sieve method and hydrometer at the Soil Mechanics Laboratory, Diponegoro University. Simple linear regression and Pearson’s correlation were used to determine the correlation between lead (Pb) with sediment fraction and its organic matter. The Pb levels obtained were 0,111 – 0,498 mg/l in water and 2,19 – 23,46 mg/kg in sediment. Sediment grain size is dominated by sand. The organic matter content ranges from 2,321 –11,893%. Pearson’s correlation (r) obtained a high positive value between Pb and finer sediment grains (silt and clay) and organic matter. High negative correlation values were found between Pb and coarser sediment grains (sand).
Keywords: Lead, sediment, organic matter

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