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Home > Spatial and Temporal Variation in Heavy Metal Toxicity and its Impact on the Ecosystem of Indus River

Spatial and Temporal Variation in Heavy Metal Toxicity and its Impact on the Ecosystem of Indus River

Thesis Info

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Author

Iqbal, Akhtar

Program

PhD

Institute

Government College University

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Environmental Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9191/1/Akhtar%20Iqbal%20%20PhD%20Thesis%20Env%20Sci.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727215465

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The Indus River is major freshwater resource for Pakistan’s 160 million people for its goods (e.g. edible fishes & water for irrigation purpose) and services (recreational, hosting migratory birds of high ecological importance).Increasing heavy metals level due to industrial and urban activities in the catchment of Indus River is a serious environmental issue with regard to health of aquatic food chain. Comprehensive investigation of heavy metal contamination in the water, sediment, aquatic plants and freshwater fishes of Indus River was needed for evaluating current heavy metal level buildup along food chain, developing necessary mitigation measures against increasing metal level for reduction of impacts on its ecosystem health and conservation of goods & survives of Indus River. The present study was conducted at three sampling sites of the Indus River including two sites (Chashma barrage and Taunsa barrage) which are “RAMSAR sites” internationally important for conservation point of view. Samples of water, sediments, aquatic plants and three commercially important freshwater fish species (Labeo rohita, Cyprinus carpio and Wallago attu) were collected on seasonal basis. Physico-chemical water quality parameters were measured in the field and Lab. Heavy metal levels were analyzed by Atomic Absorption Spectrophotometer (AAS). Ecological risk assessment of heavy metals in Abiotic media (water & sediments), aquatic plants and human health risk of fish consumption were done respectively. Heavy metals in different compartments of River Indus were found in the order of Sediment>Aquatic plants>Fish>Water. Concentration of Cr and Pb in many of water samples of Chashma and Taunsa Barrage and As concentration at Mithan kot was higher than recommended WHO water quality guidelines although these were lower than National environmental quality guidelines of Pakistan. Ecological risk evaluation through metal content of sediments depicts that in sediments, Fe concentration at Taunsa barrage, Cu concentration at Chashma barrage, Ni, Hg and Pb at Mithan kot were higher than recommended International Sediment Quality Guidelines that can pose serious risk of adverse ecological effects. Bioaccumulation factor [AF] of various parts of aquatic plants species (Typha angustifolia and Pistia stratiotes) in relation to the sediment metal concentration of Indus River was calculated which ii shows that [AF] root ratios for Typha aungustifolia was high compared to the root ratios for Pistia Stratiotes. This difference was highest in the autumn and winter seasons. Root system of both plant species was the target part for heavy metal accumulation that concentrates highest metal concentrations in it compared to leaves and stem that accumulated comparatively lower metal content. Irrespective of inter-specific metal differences, heavy metal concentrations in the root systems of both species significantly varied on seasonal basis. Carnivorous fish (Wallago attu) accumulated more heavy metal when juxtaposed with herbivorous (Labeo rohita) & omnivorous fish (Cyprinus carpio). Heavy metal levels in non-edible tissues (liver and gills) were higher than permitted level of the heavy metals by FAO. In few samples of muscle tissues, Zn concentration in all of three fish species and Cr in Wallago attu were higher than recommended FAO limits. Health risk assessment suggested that although current levels of heavy metal in fish tissues cannot pose health risk to native human communities, but these metal contents are continuously increasing. It is recommended that Cr, Hg, Pb and Zn levels should be monitored in fish tissues on regular basis as these metals have the potential to pose adverse health effects to human in future. Heavy metal concentrations especially in water and sediments of Indus River were higher in low flow season of Indus River compared with international acceptable and safe limits, this may pose serious health threats through fish consumption, and can affect water use for recreational and irrigation purposes. This is utmost important for government institutions to conduct risk assessment studies or adopt intervention strategies for restoration and management of the Indus River.
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اَرش

اَرش
اَرش کا معنی و مفہوم
ماہرین لغت کے نزدیک زخموں کی دیت کو اَرش کہتے ہیں،جیسا کہ الزبیدی لکھتے ہیں
"الأَرْشُ:الدَّيَةُ،أَي دِيَةُ الجِرَاحَاتِ،سُمِّيَ أَرْشاً لأَنَّه من أسْبَابِ النِّزَاعِ۔"169
"ارش دیت ہے یعنی زخموں کی دیت ۔اس کا نام ارش اس لیے رکھا گیا ہے کیونکہ یہ جھگڑے کے اسباب میں سے ہے "
تاوان یا جرمانہ جو شریعت نے زخموں پر مقرر کیا ہے۔کسی کو زخمی کرنے پر بھی دیت مقرر کی گئی ہے ، جیسا کہ ابن منظور نے بیان کیا
"والأَرْش من الجراحات ما ليس له قدر معلوم وقيل هو دِيَةُ الجراحات وقد تكرر في الحديث ذكر الأَرْشِ المشروع في الحُكومات وهو الذي يأْخذه المشتري من البائع إِذا اطَّلَع على عيب في المَبيع۔"170
"ارش وہ تاوان ہے جو شریعت نے زخموں پر مقرر کیا ہے اور اس طرح وہ تاوان بھی جو مبیع کے اندر عیب کے مطلع ہونے پر مشتری بائع سے وصول کرتاہے۔ "

SMART FOOT INSOLE FOR REDUCING THE RISK OF FOOT ULCERS IN DIABETIC PATIENTS BY MEASURING PLANTAR PRESSURE

Background of the Study: The prevailing cause of Diabetes is a decline in insulin production, the outcome of which is an elevated glucose level in the blood. The superabundance of glucose in the blood can cause severe complications, damaging other body organs, including kidneys, nerves, heart, and upper and lower limbs. However, the common complication in diabetic patients is foot ulcer, which is directly associated with Diabetic peripheral neuropathy (DPN), which is the extensive cause of this. DPN is the inability of nerves to sense any external change, due to which the foot plantar pressure is altered and evolves because of the high glucose level. Methodology: This paper provides a solution in the form of a portable and cost-effective device based on force sensors for diabetic patients to monitor the change in foot plantar pressure at home and overcome the risk of foot ulceration. The device is implemented on 30 participants to characterize the plantar pressure values with flat foot and normal foot types for the Control group and diabetic group. Results: An evident difference in the value of Mid-foot pressure is observed for both the groups, Control group (Normal foot = 144+2.63 kPa, Flat foot = 150+2.72 kPa) and Diabetic Group (Normal foot = 213+2 kPa, Flat foot = 216+1 kPa). Deviation in these values discriminates the mid-foot pressure for the two groups, thus providing us a range for the individuals of the control group for the alarming situation. Conclusion: Noticing the plantar pressure through the proposed device helps diabetes patients reduce their risk.

Developing Critical Thinking Through Questioning and Role Play Among Elementary Students

The purpose and the first focus of the study was to examine whether questioning and role play are viable and potentially productive teaching strategies in developing students’ critical thinking at upper primary level in Pakistan. The second research focus was to explore the effect of intervention on attitudes of students. The study was conducted in two classrooms of one Public school over one term in the academic year 2014. In relation with first research focus, design based research was used as key methodology over two cases studies.Evidence was collected in a usual classroom context in the form of observation (audio video recordings), questionnaires, and field notes. The purpose was to collect data in the classroom that was as natural as possible. The first research focus was evaluated through the indirect evidence of its effects on critical thinking. The first of these were considered the extent to which students were displaying either in weak or moderate or strong critical thinking. The analysis was corroborated by questionnaire results and class room discourse. Paul''s intellectual standards were used for teaching and as an analytical tool in examining change in student''s critical thinking.The findings of the study showed that the level of critical thinking of students was changed from weak to strong in the end of the intervention that presents the success of the intervention. In relation with second focus of the study, change of students’ attitude was measured by mean score through pre- and post- critical thinking questionnaires based on Paul''s intellectual trait model. The significant change in critical thinking attitude was an evidence of the productivity of the intervention. The researcher suggests that questioning and role play as productive teaching strategies may be practiced by the elementary teachers to have greater participation in class and increase of the level of students’ critical thinking.