Search or add a thesis

Advanced Search (Beta)
Home > To Study of Risk Assessment Due to Extent of Hydrocarbons Contamination Along Coastline of Karachi

To Study of Risk Assessment Due to Extent of Hydrocarbons Contamination Along Coastline of Karachi

Thesis Info

Access Option

External Link

Author

Fayyaz Ahmed Ansari

Program

PhD

Institute

University of Karachi

City

Karachi

Province

Sindh

Country

Pakistan

Thesis Completing Year

2015

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/13297/1/Fayyaz_Ahmed_Ansari_Chemistry_2015_Univ_of_Karachi_16.06.2016.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727614574

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Hydrocarbons naturally form in fossil fuels. Automobile exhaust, industrial emission and refused incineration are the major anthropogenic sources. Hydrocarbons enter the marine environment via atmospheric deposition, urban runoff, dumping of untreated industrial waste, petroleum losses from vessels during transportation and accidental oil spills in the sea. On entering the marine environment hydrocarbons distribute in seawater, sediments and biota. Karachi is known as industrial hub of Pakistan, being an industrial city, it produce a great amount of pollutants which ultimately transported to the coastal areas by various means. Therefore, present study was designed to determine the extent, concentration and possible risk level of hydrocarbons to marine fauna as well as on human. Seawater, sediments and marine fauna samples were collected from different sampling stations of Karachi coastal areas include Defense Housing Authorities, Clifton, Oyster Island, entrance of Karachi Harbour, Manora and Sand Spit during 2003-2006. Gas Chromatograph equipped with Flame ionization detector and capillary column was used to analyze the hydrocarbons. Seawater samples were found containing PAHs (Σ16PAHs) 1.280 μg L-1 and 0.366 μg L-1 in 2003 and 2006, respectively. Concentration of Carcinogenic PAHs (Σ7PAHs) was found 2.402 μg L-1 and 0.008 μg L-1 in 2003 and 2006 respectively. Benzo (a) pyrene, the most carcinogenic PAH, was found at 0.641 μg L-1 in 2003 but not detected in 2006. Sediment samples collected from study areas in 2003 contain average PAHs (Σ16PAHs) concentrations of 11641 μg kg-1 while in 2006 it was 37.57μg kg-1. As per sediments Quality Guidelines, Threshold Effect Level/Probable Effect Level and Effect Range Low /Effect Range Median include with mean- Probable Effect Level-quotient and m- Effect Range Median-quotient maximum probability of adverse biological effects was found 85% in 2003 which was gradually reduced to 9% in 2006. In seven fish specie, Apogon cocciveus was found lowest and Escualosa Thoracatta was found highest contaminated specie with 1.51μg/g and 732μg/g of total PAHs, respectively. Among four shellfish specie, Portunus Sanguinolentis was found lowest and Acanthopagrus Latus was found highest contaminated with 9.70 μg/g and 561.2 μg/g of PAHs, respectively. Contrary to PAH, variable levels of aliphatic hydrocarbons were found which could not lead to some meaningful risk effects. Oil spill is found to be the basic root cause for abrupt change of hydrocarbons level and destruction of marine ecosystem in coastal areas of Karachi. Although pyrogenic sources sufficiently contributed with it, however, hydrocarbons contamination level in study areas reduced with the passage of time.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

مذہبی، سماجی اور ثقافتی بیانیے: تشکیلیت، ردِ تشکیلیت اور تارڑ کا ناول’’قلعہ جنگی‘‘(ایک مابعد جدید مطالعہ)

مذہبی، سماجی اور ثقافتی بیانیے: تشکیلیت، ردِ تشکیلیت اور تارڑ کا ناول ’’قلعہ جنگی‘‘(ایک مابعد جدید مطالعہ)

"Religious, Social and Cultural Narratives"Construction, Deconstruction and Tarar's Novel Qala-i-Jangi (A Post Modern Study)

یوسف نون، پی ایچ ڈی سکالر شعبہ اردو، بہاء الدین زکریا یونیورسٹی، ملتان

بیانیہ (Narrative) کی اصطلاح کو سب سے پہلے رولاں بارتھ نے متعارف کرایا، انہوں نے اپنے ایک مضمون Introduction to the Structural Analysis میں ان بیانیوں کو نشان زد کیا جن پر ہماری ثقافت کا انحصار ہے۔ رولاں بارتھ بیانیوں کی بے شمار تعداد بتاتا ہے۔ وہ کھڑکیوں اور رنگ دار شیشوں کو بھی ایک بیانیہ شمار کرتا ہے، جو اس دنیا کو بامعنی بناتے ہیں۔ لیوتار مابعد جدیدیت کے بنیاد گزاروں میں سے ہیں۔ وہ مہابیانیوں (Grand Narrative) اور چھوٹے بیانیوں (Little Narratives) میں تمیز کرتا ہے۔ لیوتار علم کی دو قسمیں بتاتا ہے ایک سائنس دوسرا بیانیہ ہے۔ لیوتار سائنس اور بیانیہ کو دو حریفوں کی شکل میں دیکھتا ہے۔ لیوتار سائنس اور ٹیکنالوجی کی بھیڑ کے درمیان بیانیہ کا وجود لازم قرار دیتا ہے۔ سائنس کو اپنی صادقت ثابت کرنے کے لیے ثبوت کی ضرورت ہوتی ہے اور بیانیہ اس سے مبرا ہوتا ہے۔ سائنسی روایت اپنی صداقت ظاہر کرنے کے لیے بیانیہ کا سہارا لیتی ہے۔ اب سائنس بھی ایک بیانیہ کا روپ دھار چکا ہے۔سائنس اپنی معروضیت اور دیانت داری کو پیچھے چھوڑ کر طاقت ور کا آلہ کار بن چکا ہے۔ مہابیانیہ آخر ہے کیا؟ مہابیانیہ ہر وہ آفاقی تھیوری ہے جو خود کو کائناتی سچ قرار دیے جانے پر مصر ہے۔ مہابیانیے کائناتی سطح پر خود کو مستند تصور کرتے ہوئے کائنات کے نظام کی تشریح اور اس میں اپنے کلیدی کردار ادا کرنے کے دعویدار ہوتے ہیں۔ اس طرح...

أثر القرآن الكريم في شعر أحمد شوقي

Ahmad Showqi is an eminent poet in this era, and he is also leader in Egypt, Arabic World and Europe. He is pioneer in Modern Arabic History. He followed his mentor Mahmood Saami Al-Baroodi. He spent his life in grooming. Arabic thinking and was beginner and elevator of Arabic poetry. He highlighted great civilization of Arabs. This modern movement of Arabic literature is zeal and zest of this period. This article reveals a profound academic and research study of Ahmad Showqi’s poetry. The main focus of the study is the Words and Verses of Holy Quran used by Ahmad Showqi in his poetry. Ahmad Showqi has presented before us a very fine interpretation and true meanings of the Quranic words. Similarly through his poetry he has presented before us the Quranic verses and passages in an effective way. So we may describe his poetry as an interpretation of the Holy Quran.

Hydro-Glaciological Modelling of Contrasting Hydrological Regimes of Upper Indus Basin under Ipcc Climate Change Scenarios Using Fully Distributed Topkapi Model

The water resources of the Upper Indus Basin (UIB) of Pakistan, are highly sensitive and vulnerable to climate change that can severely impact the food security and livelihood of millions living downstream. So it has become pertinent to understand the hydrometeorological behavior and assess future water resources and its variability under climate change scenarios. This study was designed to analyze the hydrometeorological trends and assess the changes in the contrasting hydrological regime of snow and glacier-fed river catchments of Hunza and Astore River basins of UIB under Intergovernmental Panel on Climate Change (IPCC) climate change scenarios. In this study, fully distributed TOPKAPI model has been used that incorporates the glaciers component and generates all hydrological cycle parameters at very high spatial and temporal scale. MODIS snow cover product (years 2001 to 2015) and field-based hydrological (19662012) and meteorological data (1999-2012) was used to investigate the trend and magnitude of hydrometeorological variables using nonparametric Mann–Kendall and Sen’s Slope methods. The TOPKAPI model was successfully calibrated and validated over five years 1999-2003 with a Nash coefficient ranging from 0.93-0.94. The representative concentration pathways (RCP) 4.5 and 8.5 scenarios of the IPCC were used to project the future trend of hydro-meteorological variables. The Astore River discharge and precipitation trend were significantly (p ≤ 0.05) increased with a Sen’s slope value of 1.039 m3·s−1·yr−1 and 0.192 mm·yr−1, respectively, while the temperature was non-significantly (p ≥ 0.05) increased with the Sen’s slope value of 0.041 °C·yr−1. On the other hand, the Hunza River discharge and temperature significantly (p ≤ 0.05) decreased with a Sen’s slope value of −2.541 m3·s−1·yr−1 and −0.034 °C·yr−1, respectively, while precipitation showed a non-significant (p ≥ 0.05) increasing trend with a Sen’s slope value of 0.023 mm·yr−1. The snow cover in Western Himalayas (Astore River basin) and Central Karakoram region (Hunza River basin) of the UIB had a stable and slightly increasing trend with a Sen’s slope of 0.07%.yr−1 and 0.394%.yr−1, respectively. Under RCP 4.5 and 8.5, the increasing trend in mean temperature was observed in study area with a value of 0.03 °C.yr1 and 0.12 °C.yr-1, respectively. Overall the increasing trend in annual discharge of Astore River and decreasing trend of snow cover was observed under RCPs. Whereas the Hunza River basin followed the same snow cover and discharge trend under RCP 8.5 while under RCP 4.5 the snow cover is decreasing with an increasing trend of the Hunza River discharge till 2070, and then decline in discharge was observed during far future scenario. Based on the results of this study, it can be concluded that since both sub-basins are influenced by different climatological systems (monsoon and westerly), therefore results of those studies where UIB is treated as one unit in hydrometeorological modeling should be used with caution. Furthermore, this study can help to resolve the Karakoram anomaly and potentially be utilized to develop water policy and planning new water harvesting and storage structures, to reduce the risk of flooding.