The environmental impact of polycyclic aromatic hydrocarbons in the sediment river

Polycyclic Aromatic Hydrocarbons (PAHs) are ubiquitous in the environment and amongst greatest concern due to their toxicity and mutagenicity. As the occurrences of PAHs in Malaysia have been reported, thus this study was conducted to further assess their environmental impact in river sediments by d...

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Main Author:	Nurul Ain, Zainodin
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/18179/19/The%20environmental%20impact%20of%20polycyclic%20aromatic%20hydrocarbons%20in%20the%20sediment%20river.pdf
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spelling	my-ump-ir.181792021-12-15T00:16:42Z The environmental impact of polycyclic aromatic hydrocarbons in the sediment river 2017-01 Nurul Ain, Zainodin TA Engineering (General). Civil engineering (General) Polycyclic Aromatic Hydrocarbons (PAHs) are ubiquitous in the environment and amongst greatest concern due to their toxicity and mutagenicity. As the occurrences of PAHs in Malaysia have been reported, thus this study was conducted to further assess their environmental impact in river sediments by determination of PAHs behavior and factors that govern it. The research started with the investigation of the sorption capacity or affinity of these PAHs in sediments and the relationship between sorption and their octanol-water partition coefficient (Kow). The octanol-water partition coefficient (Kow) was a good predictor of sorption among pollutant as the results show that the solid-water partition coefficient (Koc) increased as the octanol-water partition coefficient (Kow) increased. The sorption data was plotted to graphs Linear, Freundlich and Langmuir isotherm model and the linear regression coefficient (R2) obtained for Freundlich isotherm was the highest (>0.98) among these three models. Thus, the sorption behavior of PAHs in river sediments was physisorption as it obeyed the Freundlich isotherm model. A significant effect on PAHs behavioral was observed in sediments caused by changes of salinity, pH and temperature which was indicated by the sorption capacity coefficient (Kf) obtained from batch sorption equilibrium experiments. The sorption capacity coefficient (Kf) increased as the salinity increased but vice versa as the pH and temperature was increased. The pseudo-first order, pseudosecond order, Elovichs’ equation and fractional power model graphs was plotted and pseudo-second order represents the adsorption kinetic mechanism since it has the highest linear regression coefficient (R2>0.99). Pseudo-second order confirmed that presence of pores in the sediments system was the limiting factor to the adsorption rate mechanism. Besides that, three different method of solid phase extraction were applied to pre-concentrate the samples and the method from Supelco show the highest percentage of recovery (73.53% to 88.29%) compared to other method from previous literature. Finally, the results of this study also indicated a considerable difference between experimental values and values generated by the computational model, Estimation Program Interface (EPISUITE). Thus, this study strongly shows that although the computational model was indicative, it does not accurately assess the environmental impact of pollutant. The experiments need to be conducted to obtain the real partitioning of PAHs in environment. 2017-01 Thesis http://umpir.ump.edu.my/id/eprint/18179/ http://umpir.ump.edu.my/id/eprint/18179/19/The%20environmental%20impact%20of%20polycyclic%20aromatic%20hydrocarbons%20in%20the%20sediment%20river.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Civil Engineering and Earth Resources
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Nurul Ain, Zainodin The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
description	Polycyclic Aromatic Hydrocarbons (PAHs) are ubiquitous in the environment and amongst greatest concern due to their toxicity and mutagenicity. As the occurrences of PAHs in Malaysia have been reported, thus this study was conducted to further assess their environmental impact in river sediments by determination of PAHs behavior and factors that govern it. The research started with the investigation of the sorption capacity or affinity of these PAHs in sediments and the relationship between sorption and their octanol-water partition coefficient (Kow). The octanol-water partition coefficient (Kow) was a good predictor of sorption among pollutant as the results show that the solid-water partition coefficient (Koc) increased as the octanol-water partition coefficient (Kow) increased. The sorption data was plotted to graphs Linear, Freundlich and Langmuir isotherm model and the linear regression coefficient (R2) obtained for Freundlich isotherm was the highest (>0.98) among these three models. Thus, the sorption behavior of PAHs in river sediments was physisorption as it obeyed the Freundlich isotherm model. A significant effect on PAHs behavioral was observed in sediments caused by changes of salinity, pH and temperature which was indicated by the sorption capacity coefficient (Kf) obtained from batch sorption equilibrium experiments. The sorption capacity coefficient (Kf) increased as the salinity increased but vice versa as the pH and temperature was increased. The pseudo-first order, pseudosecond order, Elovichs’ equation and fractional power model graphs was plotted and pseudo-second order represents the adsorption kinetic mechanism since it has the highest linear regression coefficient (R2>0.99). Pseudo-second order confirmed that presence of pores in the sediments system was the limiting factor to the adsorption rate mechanism. Besides that, three different method of solid phase extraction were applied to pre-concentrate the samples and the method from Supelco show the highest percentage of recovery (73.53% to 88.29%) compared to other method from previous literature. Finally, the results of this study also indicated a considerable difference between experimental values and values generated by the computational model, Estimation Program Interface (EPISUITE). Thus, this study strongly shows that although the computational model was indicative, it does not accurately assess the environmental impact of pollutant. The experiments need to be conducted to obtain the real partitioning of PAHs in environment.
format	Thesis
qualification_level	Master's degree
author	Nurul Ain, Zainodin
author_facet	Nurul Ain, Zainodin
author_sort	Nurul Ain, Zainodin
title	The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
title_short	The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
title_full	The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
title_fullStr	The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
title_full_unstemmed	The environmental impact of polycyclic aromatic hydrocarbons in the sediment river
title_sort	environmental impact of polycyclic aromatic hydrocarbons in the sediment river
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Civil Engineering and Earth Resources
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/18179/19/The%20environmental%20impact%20of%20polycyclic%20aromatic%20hydrocarbons%20in%20the%20sediment%20river.pdf
_version_	1783732029898096640

The environmental impact of polycyclic aromatic hydrocarbons in the sediment river

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