The heavy metals entering cells through the lipid
layer of the membrane by endocytosis, through a
pumping and organic chelating system. Non-essential
metals that enter the cells will compete with essential
metal to bind to ligands. Binding mechanism of
metal and proteins generally damages sulfide bonds
(N. et al., 2004). Metals binding to biomolecules then
will accumulate in hepatopancreas or be detoxify.
The mechanism of accumulation and detoxification
of heavy metals in bivalve can be seen in Figure
2. Heavy metals modify existing enzyme processes
by interfering with and replace calcium (Ca) ions
that affect oxidation. In this research-heavy metal
mercury (Hg), cadmium (Cd), and lead (Pb) of
green mussels samples are inert within the acceptable
limit for green mussels and other predators. This
can be observed from the absence of heavy metals
accumulation in mussels indicating that cadmium
(Cd) and lead (Pb) in sediments that enter mussels
body has been detoxified.
3.3 Heavy Metal Pollution Level on
Reclamation Island
Pollution level of heavy metal on water, sediments,
and biota are determining using STORET method
(US-EPA/United States Environmental Protection
Agency) based on scores (Decree of the Minister
of Environment (DMED) no. 115/2003 about
Guidelines for Determining Status of Water Quality)
(DMED No.115, 2003). Results show that heavy
metal mercury, cadmium, and lead in water,
sediments, and green mussels around reclamation
island are below standard quality so that it is included
in class A. This is probably due to the intensity of
waste disposal consist of low heavy metals.
Although in this research there was no heavy
metal pollution, it does not indicate the condition
around the reclaimed island is good. Physical and
chemical analysis of water shows that turbidity,
Biological Oxygen Demand (BOD), Chemical
Oxygen Demand (COD), and dissolved oxygen
(DO) parameters do not comply with water quality
standards in Decree Ministry of Environment and
Development No. 51/2004. Biological Oxygen
Demand (BOD) concentrations in water range from
265,3 to 593,2 mg/L, it is much higher than the
standard quality which is 20 mg/L. Chemical Oxygen
Demand (COD) concentrations in water range from
70,0 to 85,1 mg/L that higher than the standard
quality which is 20 mg/L. dissolved oxygen (DO)
concentrations in water range from 3,89 to 5,16 mg/L
that below than the standard quality which is 5 mg/L
except for Teluk Naga station. These parameters
illustrated the high pollution around the reclaimed
island.
4 CONCLUSIONS
Based on the results it can be concluded that :
• Mercury (Hg), cadmium (Cd) and lead (Pb)
content in the water below the water quality
standard for biota. Mercury (Hg), cadmium (Cd)
and lead (Pb) content in sediments below the
standard set by IADC/CEDA. The content of
heavy metal in water and sediment of reclamation
islands are safe for biota. High Biological Oxygen
Demand (BOD) and Chemical Oxygen Demand
(COD) content showed high organic pollution
around reclaimed islands C and D
• There is no accumulation of heavy metal mercury
(Hg), cadmium (Cd) and lead (Pb) occur in green
mussels.
• Heavy metal pollution level in the water,
sediment, and green mussel organs based on the
STORET (US-EPA) method included in class A
which is classified as not contaminated by heavy
metals mercury (Hg), cadmium (Cd), and lead
(Pb). Mercury (Hg), cadmium (Cd), and lead
(Pb) quality index in reclamation island C and D
amounts to 18 so that it is classified as good.
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Biosurvey of Mercury (Hg), Cadmium (Cd), and Lead (Pb) Contamination in Reclamation Island-Jakarta Bay
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