Gulma Mata Ikan (
Lemna perpusilla
L.) sebagai Agen Penyerap Logam Berat (Cu,
Cd, Mn dan Fe) dalam Limbah Cair Laboratorium Kimia
Duckweed (Lemna perpusilla
L.
) as Heavy Metals (Cu, Cd, Mn and F e) Absorbant
Agent of Chemical Laboratory Wastewater
Oleh
Maria Dwi Merdekaningsih
NIM : 652009018
TUGAS AKHIR
Diajukan kepada Program Studi Kimia, Fakultas Sains dan Matematika
guna memenuhi sebagian dari persyaratan untuk mencapai gelar Sarjana Sains
Program Studi Kimia
Fakultas Sains dan Matematika
Universitas Kristen Satya Wacana
GULMA MATA IKAN (
Lemna perpusilla L.
) SEBAGAI AGEN PENYERAP LOGAM
BERAT (Cu, Cd, Mn dan Fe) DALAM LIMBAH CAIR LABORATORIUM KIMIA
Duckweed (
Lemna perpusilla L.)
as Heavy Metals (Mn, Cd, Cu and Fe) Absorbant Agent of
Chemical Laboratory Wastewater
Maria Dwi Merdekaningsih
*, A. Ign. Kristijanto** , dan Sri Hartini**
*Mahasiswa Program Studi Kimia Fakultas Sains dan Matematika
**Dosen Program Studi Kimia Fakultas Sains dan Matematika
Universitas Kristen Satya Wacana, Salatiga
Jln. Diponegoro no 52-60 Salatiga50711 Jawa Tengah
–
Indonesia
The objectives of this study are: Firstly, to determine the effectiveness absorption of
Copper (Cu), Cadmium (Cd), Manganese (Mn), and Iron (Fe) from laboratory wa stewater by
various duckweed (Lemna perpusilla
L.
) population densities. Secondly, to determine the
optimum of duckweeds population densities in the absorption of Cu, Cd, Mn and Fe. Heavy
metal content and physic-chemical parameters of ch
emical laboratoty’s wastewater and
duckweed were analysis before the study was carried out. Duckweeds are adapted in the
bucket using a mixture of well water and paddy water as planting medium. The treatment are
various ratios of the bucket’s surface that
covered by duckweeds. To measure the depletion of
heavy metal (Cu, Cd, Mn and Fe) totally, this study was carried out in 6 days period with the
observation period is every 2 days. Data were analyzed by Randomized Completely Block
Design (RCBD), 6 treatments and 4 replications while as the blocks are the time analysis. As
the treatment are various percentage of the bucket’s area coverage, which are : 0% (control,
no duckweed), 12,5%, 25%, 37,5%, 50%, 62,5%, respectively. To test the differences between
treatment means, the Honestly Significant of Differences (HSD) were used using 5% level of
significant. The results of this study show that for 6 days of treatment, the effectiveness of
copper (Cu) absorption from chemical laboratory wastewater is 70%, for Mn is 97,13%, and
Fe is 33,60% at 62,5% duckweed coverage on the bucket’s then for Cd is 56,04% at 50%
