DISTRIBUSI KONSENTRASI LOGAM BERAT (CU DAN CD) PADA SEDIMEN SUNGAI MENGGUNAKAN TEKNIK DIFFUSIVE GRADIENT IN THIN FILM = Distribution of Cu and Cd Concentration in the River using Diffusive Gradient in Thin Film Tehnique

Abstract

DISTRIBUSI KONSENTRASI LOGAM BERAT (CU
DAN CD) PADA SEDIMEN SUNGAI MENGGUNAKAN
TEKNIK DIFFUSIVE GRADIENT IN THIN FILM =
Distribution of Cu and Cd Concentration in the River using
Diffusive Gradient in Thin Film Tehnique
Fauziah Nurhamiddin* dan Zulkifli Zam Zam**
* Fakultas MIPA Universitas Muhammadiyah Maluku Utara
** Program Studi Pendidikan Kimia Universitas Khairun Ternate
E-mail: zul_kifli79@ymail.com
Diterima: 01 April 2013; Dikoreksi: 04 Mei 2013; Disetujui : 12 Mei 2013
Abstract
Sediment in the bottom of the river has the potential as a store of inorganic compounds such as Cu
and Cd, which are from human activities. The purpose of this research was to determine the type
and nature of the sediment contained in the river, to know the characteristics of the sediments and
the distribution of Cu and Cd concentrations in variations of the river sediment depth, as well as to
determine the concentration profiles of Cu and Cd in each sediment depth. The results showed that
the type of sediment in the Brantas River can be classified into argillaceous sand. The concentration
of Cu and Cd in the second location is higher than in the first location. Cu metal concentrations in
sediments ranged from 0.0028 to 0.0922 ppm, and Cd metal concentration in the sediments ranged
from 0.0022 to 0.2147 ppm .Brantas River sediments on both locations can be classified into fully
sustained type which the sediments are able of to supply solutes into the pore water so that flux
solute to pore water is equal to the flux solutes from pore water to prob DGT. This happens because
the speed of diffusion of solutes from the solid particles sediment to pore water is equal to the speed
of diffusion of solute from the pore water to prob DGT. Sediments at both locations can be included
in the category of fully unsustained. From these results, it can be concluded that the Brantas River
sediments have a role that is not functioning as a store of Cu and Cd metal because it is easy to
release metals into the river.
Keywords: sediments, heavy metals, Cu, Cd, DGT
Abstrak
Sedimen di bawah sungai berpotensi sebagai penyimpan senyawa anorganik seperti Cu dan Cd,
yang berasal dari aktifitas manusia di sekitarnya. Tujuan penelitian ini adalah untuk mengetahui
jenis dan sifat sedimen yang terdapat pada Sungai, mengetahui karakteristik sedimen dan
distribusi konsentrasi Cu dan Cd dalam variasi kedalaman sedimen sungai, serta menentukan profil
konsentrasi Cu dan Cd pada tiap kedalaman sedimen. Hasil penelitian menunjukkan bahwa jenis
sedimen pada sungai Brantas dapat digolongkan kedalam pasir berlempung. Konsentrasi logam
Cu dan Cd pada lokasi II lebih tinggi dibandingkan dengan lokasi I. Konsentrasi logam Cu dalam
sedimen berkisar antara 0,0028-0,0922 ppm, dan konsentrasi logam Cd dalam sedimen berkisar
0,0022-0,2147 ppm Sedimen Sungai Brantas pada kedua lokasi penelitian dapat digolongkan pada
jenis fully sustained dimana sedimen mampu mensuplai solute kedalam air pori sehingga fluk solute
ke pore water sama dengan fluk solute dari pore water ke prob DGT. Hal ini karena kecepatan diffusi
solute dari partikel padat sedimen ke pore water sama dengan kecepatan diffusi solut dari pore wate
ke prob DGT. Sedimen pada kedua lokasi dapat dimasukkan dalam katagori fully unsustained. Dari
hasil penelitian ini dapat disimpulkan bahwa sedimen Sungai Brantas Hulu mempunyai peran yang
tidak dapat berfungsi sebagai penyimpan logam Cu dan Cd di perairan.karena mudah melepaskan
logam kembali ke perairan.
Kata kunci : Sedimen, Logam berat, Cu, Cd ,DGT