STABLE ISOTOPIC TECHNIQUES TO ADDRESS MARINE POLLUTION: KARACHI COAST AS A CASE STUDY

Authors

  • A. Mashiatullah Isotope Application Division, Directorate of Technology, PINSTECH, Nilore, Islamabad, Pakistan
  • T. Javed Isotope Application Division, Directorate of Technology, PINSTECH, Nilore, Islamabad, Pakistan
  • M. Z. Chaudhary Isotope Application Division, Directorate of Technology, PINSTECH, Nilore, Islamabad, Pakistan
  • M. Fazil Isotope Application Division, Directorate of Technology, PINSTECH, Nilore, Islamabad, Pakistan
  • M. S. Khan Isotope Application Division, Directorate of Technology, PINSTECH, Nilore, Islamabad, Pakistan
  • N. Ahmad Institute of Geology, University of the Punjab, Lahore, Pakistan
  • R. M. Qureshi Directorate of Coordination, PINSTECH, Nilore, Islamabad, Pakistan

Abstract

Seawater of the coastal regions near heavily industrialized and thickly populated urbanized centers normally receive large quantities of domestic, agricultural and industrial sewage. Ocean systems generally appear to be unlimited in their ability to dilute these human discharges and industrial wastes. This limit is now being exceeded in coastal waters in the vicinity of many large industrial and heavy populated coastal zones, causing threat to marine coastal resources of these areas. Considering the increasing threats of the unplanned inventory of untreated wastes into the marine coastal environment, the strength of isotope tools (δ13C) is used to understand the complex ecological systems in the marine coastal environment. This technique has been applied to study transport, behavior and fate of organic pollutants in marine coastal ecosystems of Karachi coast mainly as model studies. Carbon flow in heavily contaminated harbour channel (Manora Channel) , southeast and northwest coast have been investigated. The results indicate that shallow marine coastal waters tend to be depleted in δ 13C (TDIC) where polluted rivers through the coastal dwellings enter and get mixed with the seawater. Gradual increase in δ 13C (TDIC) are observed as the distance from pollution source is increased. Extremely depleted δ 13Corg was observed in sediment of Layari river outfall zone and Karachi fish harbor indicating input of domestic sewage through Layari river. Studies have proved that stable carbon isotope ratios of total dissolved inorganic carbon (TDIC) can be used as an effective tracer of sewage discharge and their transport in shallow marine environment.

References

L.D. Mee and J.W. Readman Nuclear and

Isotopic Techniques for investigating marine

pollution IAEA Bulletin 2 (1993) 8.

H. Shi and A. Singh J. Human Environ. 32,

No. 2 (2003) 1452.

S.J. Foster and A.C.J. Vincent, J. Fish Bio.

(2004) 1.

M. Bernhard and A. Zattera, Major

pollutants in the Marine Environment. In:

Proceedings of the 2nd International Congress

on ‘Marine Pollution and Marine Waste

Disposal’, San Remo December 17-21, 1973

(Editors: E.A. Pearson and E. De Fraja

Frangipane), Pergamon Press Ltd., 207

Queen’s Quay West, Toronto 1, Canada.

(1973) p. 195.

S. D. Costanzo, M. J. O’Donohue, W.

C.Dennison, N. R Loneragan and M.

Thomas, Mar. Pollu. Bull. 42, No. 2 (2001)

P.Fritz, J. C. Fontes, Handbook of

Environmental Isotope Geochemistry, Vol I,

Elsevier, New York (1980).

US EPA, Sample preservation. In: Methods

for Chemical Analysis of Water and Wastes,

EPA-600/4-79-020. U.S.E.P.A., Ohio, USA

(1983).

T. L Hopkins, Progr. in Oceanogr. 2 (1984)

A. Mashiatullah, In: Isotope Techniques to

Address Coastal Marine Pollution VDM

Verlag Dr. Muller GmbH and Co. KG, ISBN:

-3-639-31611-7 (2010) 18.

I.D. Clark and P. Fritz, Environmental

Isotopes In Environmental Isotopes in

Hydrology, Lewis Publishers, New York

(1997) 38.

J. C. Finaly and C. Kendall, Stable isotope

tracing of temporal and spatial variability in

organic matter sources to freshwater

ecosystem. In: Stable isotope in Ecology and

Environmental Sciences. Editors Robert

Michener and Kate Lafta, Blackwell Publisher

(2007) 283.

C. Descolas- Gros and M. Fontugne, Plant

Cell Environ. 13 (1990) 207.

J.Augley, M.Huxham, T. F Fernandes, A. R.

Lyndon and S. Bury, Coast and Shelf Sci. 72

(2007) 648.

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Published

06-04-2011

How to Cite

[1]
A. Mashiatullah, “STABLE ISOTOPIC TECHNIQUES TO ADDRESS MARINE POLLUTION: KARACHI COAST AS A CASE STUDY”, The Nucleus, vol. 48, no. 2, pp. 143–148, Apr. 2011.

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