Sebaran Bahan Organik dan Total Padatan Suspensi di Muara Sungai Loji, Kota Pekalongan

Abstract

Kota Pekalongan merupakan salah satu kota yang identik dengan wilayah pesisirnya karena terletak di bagian utara Pulau Jawa. Penduduk dan aktivitas yang padat membuat saluran irigasi dan sungai menjadi tempat pembuangan limbah, seperti limbah domestik, industri, dan limbah berbahaya (B3). Salah satu tempat yang terdampak adalah Sungai Loji, Kota Pekalongan. Penelitian ini bertujuan untuk mengetahui sebaran konsentrasi bahan organik dan padatan tersuspensi total (TSS) serta mengkaji keterkaitan bahan organik dengan TSS pada saat pasang menuju surut. Pengambilan sampel dilapangan dilaksanakan pada 19 Juni 2022 di 11 satsiun. Sampel TSS  dianalisis menggunakan metode gravimetri dan bahan organik melalui metode titrasi. Pola sebaran TSS dan bahan organik divisualisasikan menggunakan software ArGIS. Hasil penelitian menunjukkan bahwa konsentrasi bahan organik bervariasi, mulai dari 5,40 – 9,60 mg/L dan konsentrasi TSS berkisar antara 57,73 – 70,26 mg/L. Sebaran konsentrasi bahan organik dan TSS tersebut dipengaruhi oleh aktivitas antropogenik, pasang surut, arus, dan musim muson timur. Analisis koefisien korelasi (r) terkait bahan organik dengan TSS pada saat menuju surut menunjukkan nilai sebesar r = -0.223. TSS tidak secara signifikan berkontribusi terhadap keberadaan bahan organik.

Pekalongan city is known for its coastal area as it is located in the northern part of Java Island. The dense population and various activities have led to the disposal of waste, including domestic and hazardous waste, into irrigation channels and rivers. One of the affected areas is the Loji River in Pekalongan. This study aims to identify the distribution of organic matter and total suspended solids (TSS) concentrations and assess their relationship at low tide. Field sampling was carried out on 19 June 2022 at 11 stations. TSS samples were analysed using the gravimetric method and organic matter by titration method. TSS and organic matter values were visualised using ArGIS software. The results showed that the concentration of organic matter varied, ranging from 5.40 - 9.60 mg/L and the TSS concentration ranged from 57.73 - 70.26 mg/L. The distribution of organic matter and TSS concentrations was influenced by anthropogenic activities, tides, currents, and the east monsoon season. Analysis of the correlation coefficient (r) of organic matter to TSS at low tide showed a negative relationship with a value of 0.223. This illustrates that TSS does not significantly contribute to the presence of organic matter. TSS in this study is dominated by inorganic material carried by river flow from the inland areas.