Anggraeni, FransiscaNatalia (2011) Potensi Sedimen Sungai Brantas Hulu (Inlet Waduk Karangkates) terhadap Sulfat dan Sianida. Magister thesis, Universitas Brawijaya.
Abstract
Sungai Brantas Hulu merupakan salah satu sungai inlet Waduk Karangkates. Di sekitar sungai terdapat aktifitas manusia seperti pemukiman, pertanian dan perikanan. Sedimen di bawah sungai ini berpotensi sebagai penyimpan senyawa anorganik seperti sulfat dan sianida, yang berasal dari aktifitas manusia di sekitarnya Tujuan penelitian ini adalah untuk mengetahui jenis dan sifat sedimen yang terdapat pada Sungai Brantas Hulu, menentukan difusi sulfat dan sianida dari sedimen ke air permukaan, serta menentukan profil konsentrasi sulfat dan sianida pada tiap kedalaman sedimen . Penelitian dilakukan dengan mengambil sampel sedimen dengan menggunakan sediment core . Sampel diambil pada jarak tiga meter dari tepi sungai dan dari tiga titik sampling, masing-masing dengan dua ulangan. Pengukuran terhadap pH, suhu, dan konduktivitas air diatas sedimen dalam sediment core dilakukan setiap hari selama dua minggu. Karakterisasi sedimen dilakukan di Laboratorium Fisika dan Kimia Tanah meliputi tekstur sedimen, kadar air, serta BI: BJ: persen pori sedimen, pH, kadar C organik dan bahan organik, potensial redoks, dan kadar asam humat dan fulvat, Analisa terhadap sulfat dan sianida yang terdapat di dalam sedimen dilakukan dengan metode spektrofotometri. Hasil penelitian menunjukkan bahwa sedimen yang diperoleh dari ketiga titik sampling termasuk klas lempung berpasir. Fluks difusi sulfat di ketiga titik sampling berkisar antara 3,335.10 -3 mg cm -2 jam -1 di hari pertama (jam ke-0) hingga 1,198.10 -6 mg cm -2 jam -1 di jam ke-308, sedangkan fluks sianida berkisar antara 1,300.10 -4 mg cm -2 jam -1 pada jam ke-0 hingga 2,815.10 -7 mg cm -2 jam -1 di jam ke-308. Difusi sulfat dan sianida mengalami penurunan drastis hingga mendekati 0 mulai jam ke-20 hingga jam ke-308, yang menunjukkan bahwa sulfat dan sianida tidak berdifusi dari sedimen ke air permukaan, melainkan tersimpan di dalam sedimen. Secara umum, konsentrasi sulfat dan sianida dalam tiap kedalaman sedimen mengalami penurunan. Konsentrasi sulfat dalam sedimen berkisar antara 1,969.10 -6 % (b/b) hingga 1,422.10 -6 % (b/b), sedangkan konsentrasi sianida berkisar antara 1,179.10 -6 % (b/b) hingga 4,483.10 -7 % (b/b). Dari hasil penelitian ini dapat disimpulkan bahwa Sungai Brantas Hulu berperan sebagai penyimpanan (sink) bagi ion sulfat dan sianida.
English Abstract
The down-stream of Brantas River becomes one of the inlet river for the Karangkates reservoir. There are many human activities a long the river, such as recidential, agriculture, and fisheries. The sediment at the bottom of this river may act as a sink for inorganic compounds, such as sulphate and cyanide, from human activities. The aims of this research were to investigate the characteristic of the sediment, to determine the diffusion of sulphate and cyanide from sediment into the water column, and to determine the concentration profile of sulphate and cyanide in the depth of sediment. The research was carried out by taken the sediment samples using sediment cores. Samples were taken from three meters of river`s border and from three sampling sites, replicated two times for each. pH, temperature, and conductivity of water column over the sediment in the sediment core were measured every day in two weeks period. Characterisation of sediment was performed in Soil`s Physics and Chemistry Laboratory, including the sediment texture, water content, contains weight: porosity percentage of sediment, pH, the number of C - organi c and organic matters, redox potential, and the concentration of humic dan fulvic acids . Sulphate and cyanide concentration were analyzed by spectrophotometric method. The result showed that sediment in all the sampling sites was characterized as sandy clay. The flux of sulphate from all samples were between 3.335E-03 mg cm -2 hour -1 (at t = 0 hour) and 1.198E-06 mg cm -2 hour -1 (at t = 308 hours) while the flux of cyanide was from 1.300E-04 mg cm -2 hour -1 (at t = 0 hour) to 2.815E-07 mg cm -2 hour -1 (at t = 308 hours). The flux of sulphate and cyanide were reduced and almost zero from 20 hours to 308 hours-period. It was concluded that sulphate and cyanide were not diffused from sediment to overlying water, but kept in sediment. The concentrations of sulphate in depth of sediment were from 1.969E-06 % (w/w) to 1.422E-06 (w/w) while cyanide concentrations were from 1.179E-06 % (w/w) to 4.483E-07 % (w/w). It could be concluded that the sediment of the downstream of Brantas River acted as a sink for sulphate and cyanide ions.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/551.303 091 693/ANG/p/041101898 |
| Subjects: | 500 Natural sciences and mathematics > 551 Geology, hydrology, meteorology > 551.3 Surface and exogenous processes and their agents |
| Divisions: | S2/S3 > Magister Matematika, Fakultas MIPA |
| Depositing User: | Endro Setyobudi |
| Date Deposited: | 09 May 2011 10:01 |
| Last Modified: | 09 May 2011 10:01 |
| URI: | http://repository.ub.ac.id/id/eprint/157588 |
Actions (login required)
 |
View Item |