PDF eBook
Entire PDF eBook
5533k
$24
Get instant access to an entire eBook
Buy PDF Password
Download Complete PDF
eBook editions
Influence of Matrix Effect on Selected Organochlorine Pesticide Residues in Water from the Jukskei River Catchment
Gauteng, South Africa
by Chengetayi Cornelius Rimayi
Paperback
eBook PDF

Publisher: | Dissertation |
Pub date: | 2011 |
Pages: | 168 |
ISBN-10: | 1612337767 |
ISBN-13: | 9781612337760 |
Categories: | Chemistry Science Technology |
Abstract
One of the major problems encountered in qualitative and quantitative determination of residual pesticides by gas chromatography is the matrix effects. Matrix components have a considerable effect on the way analysis is conducted and the quality of results obtained, introducing problems such as inaccurate quantification, low analyte detectability and reporting of false positive or even false negative results. It was aimed to develop and validate a suitable method for counteracting the matrix effects so as to improve the detection and quantification of selected organochlorine pesticide residues from real water samples. The real water samples used were sampled from three points along the Jukskei River catchment area in Gauteng, South Africa for a period of 7 months from January to July 2010 so as to create a representative sample.An automated solid phase extraction (SPE) method coupled to Gas Chromatography- Mass Spectrometry (GC-MS) method for the analysis of 20 selected organochlorine pesticides was developed and validated for the purposes of studying the matrix effects. The analytical method showed a significant degree of validity when tested against parameters such as linearity, repeatability and sensitivity. Endosulphan beta, 4,4’ Dichlorodiphenyldichloroethane, and Heptachlor-epoxide had the broadest linear calibration ranges of 1 ppm- 0.0156 ppm. Benzene hexachloride (BHC) delta and Lindane had the lowest statistical limits of detection of 0.018 ppm. Statistical hypothesis testing indicated that there was significant linearity in all selected organochlorine calibration curves.
Four different reversed sorbent phases, including LC18, SC18- E and Strata-X (styrene divinyl benzene) were tested for organochlorine retention efficiency. The LC-18 200 mg cartridge proved to be the most robust and effective sorbent phase as it produced better recoveries varying from 90-130% for most analytes. A breakthrough volume of 100 mL for the LC-18 200 mg cartridge was determined using an optimum matrix load curve. It was then concluded that the method developed was suitable for further research towards the influence of the matrix on selective determination of the selected organochlorine pesticides.
Four different calibration methods, namely matrix-free external standard, matrix-matched external standard, matrix-free internal standard and matrix-matched internal standard were applied to test the efficiency of computing recoveries. All calibration curves for the 20 organochlorine pesticides showed significant linearity > 0.99 when plotted on both Chemstation and Excel. The calibration methods were tested on three different matrices composed of a high sample matrix (synthetic matrix), a low sample matrix (real sample matrix) and a no sample matrix (ultrapure water).
Statistical hypothesis testing led to the decision that there are significant differences between the mean recoveries of the three water sample matrices and also that the differences in the mean recoveries of the three sample matrices are independent of the both the two calibration techniques (internal standard and external standard) and calibration types (matrix-matched and matrix-free) applied. This led to the overall conclusion that the matrix effects have an overwhelming influence on the selective determination of the selected organochlorine pesticides.
PDF eBook
Entire PDF eBook
5533k
$24
Get instant access to an entire eBook
Buy PDF Password
Download Complete PDF
eBook editions
Share this book
Relevant events
NOV
10
GCGCN2DM
Global Congress on Graphene, Carbon Nanotubes and 2D Innovations
The Global Congress on Graphene, Carbon Nanotubes and 2D Innovations (Graphene Summit-2025) will be held from November 10–12, 2025, in Valencia, Spain. This prestigious event will bring together researchers, scientists, ac...
Global Congress on Graphene, Carbon Nanotubes and 2D Innovations
The Global Congress on Graphene, Carbon Nanotubes and 2D Innovations (Graphene Summit-2025) will be held from November 10–12, 2025, in Valencia, Sp...
Global Congress on Graphene, Carbon Nanotubes and 2D Innovations
The Global Congress on Graphene, Carbon Nanotubes and 2D Innovations (Gra...
Global Congress on Graphene, Carbon Nanotubes and 2D Innovations
The Global Congress on Graphene, Carbon Nanotube...
10 - 12 Nov 2025
Online Event | Spain
NOV
16
IMECE25
International Mechanical Engineering Congress & Exposition (IMECE)
A leading conference for mechanical engineers, covering a wide range of topics in the field.
In-Person Event
Renasant Convention Center
Memphis, TN, USA
November 16–20, 2025
Add to Calendar
Committee Meetings: Nove...
International Mechanical Engineering Congress & Exposition (IMECE)
A leading conference for mechanical engineers, covering a wide range of topics in the field.
In-Person Event
Renasant Convention Center
Memphi...
International Mechanical Engineering Congress & Exposition (IMECE)
A leading conference for mechanical engineers, covering a wide range of t...
International Mechanical Engineering Congress & Exposition (IMECE)
A leading conference for mechanical engineers, c...
16 - 20 Nov 2025
Online Event | United States
NOV
19
BW SEA 2025
Boiler World SEA 2025
Presenting Boiler World SEA 2025! A Gateway to Innovation, Sustainability, and Global Networking! Join us for an exciting journey through the latest in heat and steam technologies, sustainable energy solutions, and groundb...
Boiler World SEA 2025
Presenting Boiler World SEA 2025! A Gateway to Innovation, Sustainability, and Global Networking! Join us for an exciting journey through the lates...
Boiler World SEA 2025
Presenting Boiler World SEA 2025! A Gateway to Innovation, Sustainability...
Boiler World SEA 2025
Presenting Boiler World SEA 2025! A Gateway to I...
19 - 21 Nov 2025
Nonthaburi, Thailand
DEC
15
AGU25
American Geophysical Union (AGU) Fall Meeting
The submission period for session, town hall and workshop proposals for AGU25 will open March 2025.
Description: The largest Earth and space science meeting in the world, attracting scientists from around the globe.
...
American Geophysical Union (AGU) Fall Meeting
The submission period for session, town hall and workshop proposals for AGU25 will open March 2025.
Description: The largest Earth and space sci...
American Geophysical Union (AGU) Fall Meeting
The submission period for session, town hall and workshop proposals for A...
American Geophysical Union (AGU) Fall Meeting
The submission period for session, town hall and...
15 - 19 Dec 2025
New Orleans, United States
MAR
9
WCMSN-2026
World Conference on Materials Science and Nanotechnology
The World Conference on Materials Science and Nanotechnology (WCMSN-2026) will be held from March 09–11, 2026, in Paris, France. This forward-looking event will unite global researchers, scientists, innovators, and industr...
World Conference on Materials Science and Nanotechnology
The World Conference on Materials Science and Nanotechnology (WCMSN-2026) will be held from March 09–11, 2026, in Paris, France. This forward-looki...
World Conference on Materials Science and Nanotechnology
The World Conference on Materials Science and Nanotechnology (WCMSN-2026)...
World Conference on Materials Science and Nanotechnology
The World Conference on Materials Science and Na...
09 - 11 Mar 2026
Online Event | France
JUN
22
9th International Conference on Materials Science & Nanotechnology (ICMSN 2026) Hybrid Event
9th International Conference on Materials Science & Nanotechnology which will take place in the stunning city of Barcelona, Spain from June 22-23, 2026, covers a wide range of topics and themes, reflecting the diverse and ...
9th International Conference on Materials Science & Nanotechnology (ICMSN 2026) Hybrid Event
9th International Conference on Materials Science & Nanotechnology which will take place in the stunning city of Barcelona, Spain from June 22-23, ...
9th International Conference on Materials Science & Nanotechnology (ICMSN 2026) Hybrid Event
9th International Conference on Materials Science & Nanotechnology which ...
9th International Conference on Materials Science & Nanotechnology (ICMSN 2026) Hybrid Event
9th International Conference on Materials Scienc...
22 - 23 Jun 2026
Barcelona, Spain
OCT
16
ICBMM 2025
2025 The 9th International Conference on Building Materials and Materials Engineering (ICBMM 2025)
Publication:【JA index-Scopus】
The registered and presented papers will be published in below listed journals of【Scientific.Net】collection, which is indexed by Scopus, etc.
【Materials Science Forum (MSF) (ISSN print 0255...
2025 The 9th International Conference on Building Materials and Materials Engineering (ICBMM 2025)
Publication:【JA index-Scopus】
The registered and presented papers will be published in below listed journals of【Scientific.Net】collection, which i...
2025 The 9th International Conference on Building Materials and Materials Engineering (ICBMM 2025)
Publication:【JA index-Scopus】
The registered and presented papers will b...
2025 The 9th International Conference on Building Materials and Materials Engineering (ICBMM 2025)
Publication:【JA index-Scopus】
The registered an...
16 - 18 Oct 2025
Naples, Italy
OCT
17
WECE 2025
2025 4th Workshop on Electronics Communication Engineering (WECE 2025)
Proceedings:
All accepted papers after proper presentation and registration will be collected in IEEE conference proceedings, which will be included in IEEE Xplore and indexed by EI Compendex and Scopus, etc.
WECE 2025 h...
2025 4th Workshop on Electronics Communication Engineering (WECE 2025)
Proceedings:
All accepted papers after proper presentation and registration will be collected in IEEE conference proceedings, which will be includ...
2025 4th Workshop on Electronics Communication Engineering (WECE 2025)
Proceedings:
All accepted papers after proper presentation and registrat...
2025 4th Workshop on Electronics Communication Engineering (WECE 2025)
Proceedings:
All accepted papers after proper p...
17 - 19 Oct 2025
Hefei, China
OCT
17
AEES 2025
2025 the 6th International Conference on Advanced Electrical and Energy Systems (AEES 2025)
Publication:
Accepted papers after proper registration and presentation, will be published in AEES 2025 Conference Proceedings by IEEE. Conference content will be submitted for inclusion into IEEE Xplore and indexed by Ei...
2025 the 6th International Conference on Advanced Electrical and Energy Systems (AEES 2025)
Publication:
Accepted papers after proper registration and presentation, will be published in AEES 2025 Conference Proceedings by IEEE. Conference...
2025 the 6th International Conference on Advanced Electrical and Energy Systems (AEES 2025)
Publication:
Accepted papers after proper registration and presentation,...
2025 the 6th International Conference on Advanced Electrical and Energy Systems (AEES 2025)
Publication:
Accepted papers after proper regis...
17 - 19 Oct 2025
Xi'an, China
OCT
17
ICBBS 2025
2025 14th International Conference on Bioinformatics and Biomedical Science (ICBBS 2025)
Publication and Indexing:
International Conference Proceedings by ACM, archived in ACM Digital Library, indexed by Ei Compendex and Scopus, and submitted to be reviewed by CPCI. In the past 7 years, papers of ICBBS have ...
2025 14th International Conference on Bioinformatics and Biomedical Science (ICBBS 2025)
Publication and Indexing:
International Conference Proceedings by ACM, archived in ACM Digital Library, indexed by Ei Compendex and Scopus, and s...
2025 14th International Conference on Bioinformatics and Biomedical Science (ICBBS 2025)
Publication and Indexing:
International Conference Proceedings by ACM, ...
2025 14th International Conference on Bioinformatics and Biomedical Science (ICBBS 2025)
Publication and Indexing:
International Confer...
17 - 19 Oct 2025
Xiamen, China