Studi Keberadaan Mikroplastik di Sungai Kalimas Surabaya

Shadrina, Hasna Nur (2026) Studi Keberadaan Mikroplastik di Sungai Kalimas Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mikroplastik merupakan kontaminan yang semakin banyak ditemukan di perairan sungai, khususnya di kawasan perkotaan dengan intensitas aktivitas yang tinggi. Sungai Kalimas membentang sepanjang ±12 km dari pintu air Ngagel hingga Pelabuhan Tanjung Perak Sungai Kalimas di Kota Surabaya dan merupakan sungai perkotaan yang melintasi wilayah permukiman, perdagangan, pasar, dan pelabuhan, sehingga berpotensi menerima masukan mikroplastik dari berbagai sumber. Penelitian ini bertujuan untuk menganalisis keberadaan, kelimpahan, serta karakteristik mikroplastik pada air dan sedimen Sungai Kalimas dari hulu hingga hilir.
Penelitian dilakukan melalui pengambilan sampel air dan sedimen pada 5 titik yang mewakili segmen hulu, tengah, dan hilir sungai dalam kondisi 2 hari kering dan 2 hari hujan. Analisis meliputi tahapan persiapan sampel, pemisahan densitas menggunakan NaCl, degradasi bahan organik dengan metode Wet Peroxide Oxidation (WPO), serta pemilahan mikroplastik. Identifikasi karakteristik mikroplastik dilakukan menggunakan mikroskop stereo berdasarkan bentuk, warna, dan ukuran partikel. Identifikasi jenis mikroplastik dilakukan dengan uji Fourier transform Infrared Spectroscopy (FTIR). Hasil data kemudian dianalisis untuk melihat perbedaan kelimpahan berdasarkan lokasi, media, dan kondisi cuaca.
Hasil pengamatan menunjukkan bahwa mikroplastik ditemukan di seluruh titik sampling pada media air dan sedimen, dengan kelimpahan yang cenderung lebih tinggi pada kondisi hari hujan dibandingkan hari kering. Pada hari hujan, kelimpahan di air berkisar 55,3–100,2 partikel/L dan pada sedimen 1.120–3.120 partikel/kg, sedangkan pada hari kering nilainya lebih rendah yaitu 20,7–58,9 partikel/L pada air dan 720–2.430 partikel/kg pada sedimen. Karakteristik mikroplastik didominasi oleh bentuk fiber dengan warna transparan, dan analisis FTIR mengidentifikasi lima jenis polimer yaitu Polypropylene (PP), Polyethylene (PE), Polyethylene terephthalate (PET), Nylon 6 (Polycaprolactam), dan Polyurethane (PU), dengan PP sebagai polimer dominan. Pola persebaran yang meningkat menuju hilir menegaskan peran Sungai Kalimas sebagai koridor transportasi mikroplastik dari daratan menuju wilayah pesisir.
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Microplastics are an emerging contaminant increasingly found in river waters,particularly in urban areas with high anthropogenic activity. The Kalimas River extendsapproximately 12 km from the Ngagel district gate to the Tanjung Perak Port in Surabaya Cityand is an urban river that traverses residential, commercial, market, and port areas, making itsusceptible to receiving microplastic inputs from various sources. This study aims to analyzethe presence, abundance, and characteristics of microplastics in the water and sediment of theKalimas River from upstream to downstream.The study was conducted by collecting water and sediment samples at five pointsrepresenting the upstream, midstream, and downstream segments of the river under two dry-day and two rainy-day conditions. The analysis included sample preparation, density separationusing NaCl, organic matter degradation through the Wet Peroxide Oxidation (WPO) method,and microplastic sorting. The characteristics of microplastics were identified using a stereomicroscope based on particle shape, color, and size. Microplastic polymer types were identifiedthrough the Fourier Transform Infrared Spectroscopy (FTIR) test. The resulting data were thenanalyzed to examine differences in abundance based on location, media, and weather conditions.The observation results indicate that microplastics were found at all sampling points inboth water and sediment media, with abundance tending to be higher under rainy-day conditionsthan dry-day conditions. On rainy days, the abundance in water ranged from 55.3 to 100.2particles/L and in sediment from 1,120 to 3,120 particles/kg, whereas on dry days the valueswere lower at 20.7 to 58.9 particles/L in water and 720 to 2,430 particles/kg in sediment. Thecharacteristics of microplastics were dominated by fiber-shaped particles with transparent color,and the FTIR analysis identified five polymer types, namely Polypropylene (PP), Polyethylene(PE), Polyethylene terephthalate (PET), Nylon 6 (Polycaprolactam), and Polyurethane (PU),with PP as the dominant polymer. The distribution pattern that increases toward the downstreamsegment confirms the role of the Kalimas River as a transport corridor for microplastics fromland to coastal areas.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Air, Fourier Transform Infrared Spectroscopy, Mikroplastik, Sedimen, Sungai Kalimas, Fourier Transform Infrared Spectroscopy, Kalimas River, Microplastics, Sediment, Water
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD420 Water pollution T Technology > TD Environmental technology. Sanitary engineering > TD427.P62 Microplastics--Environmental aspects.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Environmental Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	Hasna Nur Shadrina
Date Deposited:	23 Jul 2026 03:35
Last Modified:	23 Jul 2026 03:35
URI:	http://repository.its.ac.id/id/eprint/136375

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