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Assessment of Selected Persistent Organic Pollutants in River Ravi and its Northern Tributaries, Pakistan

Thesis Info

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Author

Mujtaba Baqar

Program

PhD

Institute

University of the Punjab

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Environmental Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/10938/1/Mujtaba%20Baqar_Env.%20Sci_2018_UoPunjab_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676724522833

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The persistent organic pollutants (POPs), particularly organochlorines are of key global concern due to their persistence and toxicity in the environment. The present study investigated the occurrence levels, spatio-temporal distribution, risks to both, ecological integrity and human health through dermal and oral exposure to the organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) across River Ravi and its three northern tributaries (Nullah Bein, Nullah Basantarand Nullah Deg) that provides the baseline data for the occurrence of POPs from the study area. The present study is a pioneer investigation from Pakistan to assess the bioavailable level of POPs using mussels as bioindicator species. The water (n=54) and sediments (n=54) samples from twenty-seven sampling sites and freshwater mussels (n=30) samples from fifteen sampling stations were collected across the four aforementioned streams in two alternate seasons (pre-monsoon and post-monsoon). The ∑23OCPs concentrations were ranged from 13.61 to 1992.18 ng/g dry weight (dw), 189.66 to 2049.40 ng/g, and 12.89 to 128.16 ng/L in sediment, freshwater mussels and water matrices, respectively. The ∑35PCBs concentrations were ranged from 1.06 to 95.76 ng/g (dw) in sediments, 1.94 to 11.66 ng/L in water, and 25.81 to 135.38 ng/g in freshwater mussel samples. Among the OCPs, the dominance of ΣDDTs, ΣHCHs and Σendosulfan were observed in all three studied environmental matrices. The PCBs homologs analysis indicated that penta-CBs and hexaCBs in sediments and mussels, and tetra-CBs and tri-CBs in water were predominant homologs. Based on the POPs contamination levels, the tributaries of River Ravi followed the contamination order as; Nullah Deg> Nullah Basantar > Nullah Bein and fresh addition of lindane, technical DDTs and chlordane were identified in the study area. The OCs levels in the environment were found to be higher than previous studies from Pakistan and other parts of the world. The ecological risk assessment indicates considerable potential ecological risk (= 95.17) associated with PCBs contaminations. The ecological risk assessment of OCPs elucidates high risks for endosulfan (αendosulfan) and endrin. The human health risk assessment indicated absence of hazardous (non-carcinogenic) risk through dermal exposure in studied streams; while, the considerable carcinogenic risks associated to aldrin, dieldrin, p,p’-DDT, β-endosulfan and PCBs was found at certain studied sites. The oral exposure to OCs through mussels consumption revealed existence of substantial carcinogenic risk (Hazard Ratio > 1) for OCPs and PCB at both, 50th and 95th percentile concentration in mussel tissues. Therefore, the high levels of ecological risk and carcinogenic human health risk had emphasized an immediate elimination of ongoing OCPs usage and PCBs release in the studied area. Moreover, in Pakistan, comprehensive ecological and human health risk studies, and firm statutory initiatives are needed to be taken in debt to the Stockholm Convention, 2001 to cope up with the OCs contamination in various environmental matrices of the country.
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ماتم

کرنا ہو کسی زن کو جب کسی غم کا ماتم
چوڑی اپنے ہاتھ کی وہ توڑ دیتی ہے
سجنا چھوڑ دیتی ہے سنورنا چھوڑ دیتی ہے

پر لاحق ہو کسی مرد کو جب کوئی غم
تو کیسے کرے وہ اس کا ماتم

چوڑی آخر وہ نہ پہنے
غم میں جس کو توڑے وہ
نہ مثلِ عورت وہ بھی سنورے

ماتم میں جس کو چھوڑے وہ
کیا کرے پھر وہ بیچارا
کس کا لے آخر سہارا

ہاں اک بات آخر ہونے لگتی ہے
کہ داڑھی اُس کی وضع کھونے لگتی ہے
جبیں پہ غم سجا لیتا ہے وہ
اور بال اپنے بڑھا لیتا ہے وہ

آؤ دیکھو تو سہی میں نے
وہ سب چلن اپنا لیے ہیں
اور بال بھی اپنے بڑھا لیے ہیں

IMMEDIATE EFFECTS OF POST-ISOMETRIC RELAXATION AND STATIC STRETCHING ON QUADRICEPS MUSCLE DURING VERTICAL JUMP IN VOLLEY BALL AND BASKETBALL PLAYERS

Background and Aim: In today sports such as volleyball and basketball, Vertical Jump is considered as important component that enhance the performance of athlete. The aim of this study was to determine the effect of muscle energy technique on vertical jump performance in volleyball and basketball players. Methodology: This Randomized Clinical Trial was conducted at Islamic International University Islamabad. Twenty-nine athletes of age 18 – 35 playing basketball and volley as part time/domestic level were included. Post isometric relaxation technique was applied on group A (n=15) and static stretching was applied on group B (n=14). Surface electromyography activity of quadriceps and abdominal muscle was recorded, Stable time, airtime and vertical jump height were measured using two-axis force platform and vertical jump height was measured by motion sensor. Measurements were taken at baseline and immediately after applying interventions to both groups. Data entry and analysis were done by using software SPSS version 22. Results:   Of the 29 athletes, 15 were in the group A and 14 were in the group B. Immediate assessment of vertical jump height was not significantly improved by post-isometric relaxation relative to static stretching (p=0.594). Muscle recruitment, ground reaction and vertical jump height improved apparently after post isometric relaxation but not significantly. Conclusion: It appears that post isometric relaxation and static stretching of quadriceps shows no significant difference in vertical jump height.

Gesture Recognition for Dynamic Signs for Urdu Language

Sign language is the language of gestures. It is also a way of communication for the deaf community. Sign languages use visual pattern rather than verbal communication. Sign Language Recognition (SLR) is an active research area in computer science. It has its roots in the domain of gesture recognition, robotics, gesture-based user authentication, lie detection communication, entertainment, security, art, industry, and sports. Every region has its own sign language. Pakistani Sign Language (PSL) for Urdu language is a visual-gestural language that is being used for communication by the deaf community. This research presents a robust, reliable, systematic and consistent system for both static and dynamic gestures. The present research focuses on different available solutions for gesture recognition and concludes that deep learning and convolutional neural networks give a most appropriate solution. The thesis is based on the comparison of different potential sign descriptors. Use of correlation and cross-correlation to identify gestures has led the researcher to the fact that supervised learning techniques have given a convincing performance for PSL or even any other sign language. The research has proposed 3 major ideas, it starts with proposing universal sign language and use of spelling-based gestures over word-based gestures. The research also proposes a video summarization technique for sign languages based on mean and entropy. Moreover, there is no standard dataset available for PSL, so dataset for a subset of static and dynamic signs of PSL is developed for the thesis. The research gives upto 90% accuracy when the recognition routine uses deep learning based model. The dataset is kept as small as 400 images/videos per class. The research has proven that the accuracy can be improved by increasing dataset size, image size, and number of epochs.