Proposal FYP
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Transcript of Proposal FYP
KULLIYYAH OF SCIENCEINTERNATIONAL ISLAMIC UNIVERSITY MALAYSIA
FINAL YEAR PROJECT PROPOSAL
NAME: MUHAMMAD AFIQ B. HAMZAH
MATRIC NUMBER: 0629991
DEPARTMENT: DEPARTMENT OF BIOTECHNOLOGY
CONCENTRATION: BIOTECHNOLOGY (MARINE)
TITLE: HEAVY METALS CONCENTRATION IN MOLLUSC (BIVALVE)
ALONG THE COASTAL AREA OF LANGKAWI ISLAND
SUPERVISOR: PROF. DR. KAMARUZZAMAN B. YUNUS
Co-SUPERVISOR: NIL
INTRODUCTION
Aquatic environments are often at risk of exposure to pollutants, either from
specific and non-specific sources. Most of the pollutants released to the aquatic
ecosystems are heavy metals which are frequently present at elevated concentration,
as a result of industrial discharges, domestic sewage, non-point runoff and
atmospheric precipitation (Tao et al., 1998). The environment impact of introducing
heavy metals (like Hg, Pb, Cu and Zn) into estuaries and coastal areas has been an
issue of great concern and significance. Toxicity of metals is well known for
centuries. Heavy metals like copper, zinc and iron are essential metals for fish and
shellfish since they play an important role in biological systems. Some others such as
mercury, cadmium and lead are non-essential metals and have no known role in
biological systems as they are toxic even in trace amounts (Ong et al., 2007).
However, if the essential metals are taken in excessively, it can also be a threat to the
organisms. Accumulation of pollutants in fishes can be passed to human through the
food chain which can causes severe health effects. In modern history, mass poisonings
by metals especially Hg in many countries as for example the Minamata case in Japan,
and some serious case in Arabian Gulf and Indian Ocean had lead the scientific
community to intensification of research of the toxic effect of heavy metals to living
organisms. These cases often occur at developed areas of human activities. The
studies will be conducted at Langkawi Island as it is well known as a tourist attraction
site. The booming of tourism industries led to exponential development of resorts and
hotels to accommodate such activities. As more buildings are built, the amount of
sewage disposed also increase. Thus, it is prominent to monitor the impact of the
pollution occurred and it can be done by measuring the heavy metals presence in the
mollusc (bivalve) along the coastal area. This will act as a bioindicator to determine
the level of pollution.
OBJECTIVE:
i. To determine the concentration of heavy metals (Pb ,Cu and Zn) in the mollusc (bivalve - mussels, cockles, etc) along the coastal of Langkawi Island.
ii. To determine the degree of heavy metal contamination in marine commercial mollusc (bivalve) of these areas.
iii. To evaluate concentration of heavy metals in mollusc (bivalve) with respect to national standard for human health.
LITERATURE REVIEW
Heavy Metal
Heavy metals are defined as any metallic chemical element that has an atomic
number over 20 which relatively are high in density and are toxic or poisonous at low
concentrations. Heavy metals are natural components of the Earth's crust and they
cannot be degraded or destroyed. Some heavy metals are neurotoxin, for instances
lead, mercury, nickel, zinc, cadmium, chromium and manganese (Stewart, 1975).
However, as trace elements, some heavy metals for example, copper and zinc are
essential to maintain the metabolism of the human body. Yet, at higher concentrations
they can lead to poisoning as heavy metals tend to bioaccumulate in the affected
organisms. Bioaccumulation means an increase in the concentration of a chemical in a
biological organism over time, compared to the chemical's concentration in the
environment. Compounds accumulated in the living things are taken up and stored
faster than they are metabolized or excreted. According to Kamaruzzaman et al.
(2007), heavy metals from natural and anthropogenic sources are continually released
into aquatic system and they are serious threats because of their toxicity, long
persistence, bioaccumulation and biomagnifications in the food chain.
Copper (Cu)
Copper with the symbol Cu is group IB element in periodic table with an atomic
number of 29 and atomic mass of 63.546 (Hill and Petrucci, 2002). Copper is an
essential substance to human life, but in high doses it can cause deleterious effects to
human health. According to Shahnaz and Dayanthi (2006), copper is an essential
metal and important component of the respiratory pigment haemocyanin in
crustaceans. Copper sources are normally from drinking water from copper pipe,
metal plating, industrial and domestic waste, mining and mineral leaching. Copper-
containing compounds have been used in Florida as fungicides, herbicides, and soil
amendments, resulting in elevated Cu in the aquatic ecosystem (Rogevich et al.,
2008).
Zinc (Zn)
Zinc, with its molecular formula is Zn, has a molecular weight of 65.38 and a
density of 7.14 g/cm3. It has a melting point and boiling point at 419.5°C and 908°C
(EPA, 2005). Zinc is an essential trace element for all living organisms but an excess
or a deficiency in zinc uptake might lead to stimulation or retardation of cancer in
human and certain animals. Zinc and copper are used in small amounts as fertilizers in
some soils deficient in these elements. It is said that the primary anthropogenic
sources of zinc in the environment are from the metal smelters and mining activities
(ATSDR, 1995), while the production and uses of zinc in brass, bronze, die castings
metal, alloys, rubbers, and paints may also lead to its release to the environment
through various waste streams (EPA,2005).
Lead (Pb)
The symbol of lead is Pb and its atomic number is 82 with atomic weight of 207.2,
a melting point at 327.502 °C and the boiling point is about 1740 °C (Hill and
Petrucci, 2002). Lead is usually stored in the human bones, brain and teeth. One of the
few negative effects of lead to human is impairment of mental and physical
development. Lead can reacts with the red blood cell membrane to increase its
mechanical fragility. It also can cause nervous system impairment and muscle pain,
and can be passed throughout generations. Lead enters aquatic environment by a
number of pathways. The earth’s crust, geologic weathering phenomena and volcanic
activity account for natural sources, but most waterborne lead derives from human
activities such as mining and smelting, coal burning, cement manufacturing and is
used in gasoline (Rogers et al., 2003).
Heavy Metals in Mollusc (bivalve)
Metals deposited in the aquatic environment may accumulate in the food chain
and cause ecological damage and even form threats to human health (Bervoets et al.,
1999). Aquatic microflora and microfauna, which constitute fish food, are capable of
incorporating and accumulating heavy metals into their living cells from their
environment. Mostly all type of bivalve is filter-feeder organism. They are benthic
organisms which mean they live on the ocean floor. They feed by consuming the
nutrient-rich water and sediment. Their filter-feeder mechanism act by separating the
essential nutrients from the unwanted debris like soil. However, their mechanism do
not separate the heavy metals present in the environment thus consuming them as part
of their diets. This will lead to bioaccumulation of the heavy metal in the organism.
Benthic organisms tend to accumulate more heavy metal due to the higher metal level
in the sediment compared to the water (Vigh et al., 1996).
Green Mussels as bioindicator
Bioindicator organisms have been used in pollution monitoring studies for
detecting pollution in certain ecosystem. Bioindicators are organisms that are
used to assess pollution by either measuring the organism’s tissue content or by
their sensitivity towards pollution. The organisms chosen as bioindicators should
show tendency of accumulating the pollutant in their body or sensitivity towards
certain pollutants. Bioindicators not only reflect chemical exposure but also have
the capacity to integrate many of the physical, chemical and biological stressors
that operate in aquatic ecosystems (Ham et al., 1997). Green mussels have been
long established as a bioindicator for heavy metals in Thailand and Hong Kong.
Mussels were suggested long time ago to be good biomonitoring agents due to
their wide geographic distribution, sedentary lifestyle, stable population, easy
sampling, bioaccumulation and correlation with the average pollutants of the
environments, tolerance of salinity, resistance to stress of high accumulation of
wide range of chemicals and they can provide an assessment of bioavailability.
However, in Malaysia only limited studies has been carried out on the biology,
ecology and bioaccumulation of heavy metals by green mussels along the
Malacca Straits only. So, the study on the bioaccumulation of green mussels in
the coastal water of Langkawi Island could enable us new array on this
commercial importance species.
HYPOTHESIS
There might be accumulation of Copper (Cu), Zinc (Zn), and Lead (Pb) in mollusc
(bivalve) caught along the coastal area of Langkawi Island.
METHODS
The place where the study will take place is the coastal area of Langkawi Island.
Langkawi Island is located in the state of Kedah and part of the Malacca Straits. This
place fall under West Coast of Malaysia.
Sampling Procedure:
First, three locations will be selected as sampling site prior to the sampling. Next,
three species of bivalve (to be determined at the sampling site) of the same size will be
collected at each site. Samples will be collected in labelled bags or boxes. Then,
samples will be kept at storing temperature (0oC to -20oC) for transportation to lab for
further analysis.
Laboratory Work:
For extracting the tissues needed for heavy metal testing, first, the bivalves will be
thawed under running water at the lab. Next, the bivalve’s shell will be opened to get
the organs and meat inside. The organs and meat of the bivalve will be weighed using
analytical balance. The samples will be put into different plate and labelled according
to the species. Later, the samples will be dried in oven at 70oC for 72 hours. After the
sample dried, they will be stored inside a dry place until further use.
Acid Digestion:
Before digestion, the Teflon beakers will be cleaned thoroughly with a detergent
solution, rinsed with tap water, soaked in 5% nitric acid for at least 24 hours, and then
rinsed with metal-free water (EPA, 2000). Then, 1.0g of the bivalve’s tissues will be
heated in Teflon beaker with mixed concentrated acids of Hydrogen Peroxide (H2O2),
nitric acid (HNO3), hydrochloric acid (HCl) and sulphuric acid (H2SO4) in the ratio of
1:1 (Kamaruzzaman et al, 2008). The beakers will be kept heated at 100°C for two to
three hours and then, hydrogen peroxide (H2O2) will be added as to breakdown any
recalcitrant lipid material that remains in the solution. Next, the acids will be added
constantly until clear, light yellow solutions were obtained. The digestions of samples
were done along with a control (mixed of acids added) and a standard reference
material from green mussel for each batch of digestion. After cooling, the clear
solutions will be filtered and transferred into 50mL Falcon tubes and 5% of nitric acid
(HNO3) will be made up to 50mL. Lastly, the tubes will be sealed and kept in the
refrigerator prior to sample analysis.
Statistical Analysis:
The samples will be analysed by using inductively coupled plasma mass spectrometer
(ICP-MS). ICP-MS is used for quick and precise determination of copper, zinc and
lead in the tissue samples. It can detect the heavy metals in ppb value an in 100 times
dilution. Several analysis of the data will be done which are Metal recovery
measurement (the recovery for quality assurance), Formula for measurements
(calculation based on dry weights), and formula of calculations of heavy metal
concentration in bivalve’s tissue according to the equation below:
µg metal = [(reading/1000) x (weight of test tubes x 1000) x (diluted volume)]
g dry weight [(dry sample weight) x 1000]
EXPECTED RESULTS
1) Record of concentration of heavy metals in mollusc (bivalve) along the coastal
area of Langkawi Island
2) Determine the level of pollution in Langkawi Island coastal area
3) Report and publication for the Final Year Project journal
4) Direct cooperation with various related agencies and departments
5) New methodology for future research and development
REFERENCES
ATSDR (Agency for Toxic Substances and Disease Registry). (1995). Toxicological profile for zinc. Public Health Service, U.S. Department of Health and Human Services, Atlanta, GA. Available online at http://www.atsdr.cdc.gov/toxprofiles.
Bervoets, L.R. and Verheyen, R. (1999). Accumulation of metal in the tissues of three spinned stickelback (Gasterosteus aculeatus) from natural sea water. Ecotoxicology and Environmental Safety. 48, 117-127.
Ham, K.D., Marshall, S.M. and Peterson, M.J. (1997). Application of multiple bioindicators to differentiate spatial and temporal variability from the effect of contaminant exposure on fish. Ecotoxicology and Environmental Safety. 37, 53-61.
Hill, W.J and Petrucci, R.H. (2002). General Chemistry: An integrated approach, Prentice Hall, United States of America.
Kamaruzzaman B. Y. et. al. (2008). Levels of Heavy Metals in Green-Lipped Mussel Perna veridis (Linnaeus) from Muar Estuary, Johor, Malaysia. Pakistan Journal of Biological Sciences, 11 (18): 2249-2253.
Kamaruzzaman, B.Y., Zaleha, K., Ong, M.C. and Willison, K.Y.S. (2007). Copper and zinc in three dominant brackish water fish species from Paka Estuary,
Terengganu, Malaysia. Malaysian Journal of Science. 26, 65-70.
Ong, M.C., Effendy, A.W.M. and Kamaruzzaman, B.Y. (2007). Determination of Pb, Cu, Cd and Zn in fish sample of the Mengabang Telipot River surrounding University Malaysia Terengganu by ICP-MS. Malaysian Journal of Science. 26, 71-78.
Rogers, J.T., Richards, J.G. and Wood, C.M. (2003). Ionoregulatory distruption as the acute toxic mechanism for lead in rainbow trout (Onchorchynchus mykiss). Aquatic Toxicology. 64, 215-234.
Shahnaz, K. and Dayanthi, N. (2006). Sensitivity of juvenile freshwater Cryfish Cherax destructor (Decapoda: Parastacidae) to trace metals. Ecotoxicology and Environmental Safety. 68, 463-469.
Stewart H. (1975). Heavy metals in: Pharmacological Basis of Therapeutics 5th ed. Goodman L.S. and Gilman A. (ed). Macmillan. New York. Pp 924-941.
Tao, S., Liang, T., Cao, J., Dawson, R.W. and Liu, C. (1998). Synergistic effect of copper and lead uptake by fish. Ecotoxicology and Environmental Safety. 44, 190-195.
U.S. Environmental Protection Agency (EPA). (2005). Toxicological review of zinc and compounds.
U.S. EPA. 2000. Guidance For Assessing Chemical Contaminant Data For Use in Fish Advisories. Volume II: Risk Assessment and Fish Consumption Limits. U.S. EPA, Washington, DC.
Vigh, P., Mastala, Z. and Balogh, K.V. (1996). Comparison of heavy metal concentration of Grass Carp in a shallow eutrophic lake and fish pond. Chemosphere. 32, 691-701.
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