Accident majeur Pollution du Rhin par des pesticides Le 1 ...
Detection and analysis of pesticides pollution
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Transcript of Detection and analysis of pesticides pollution
WelcomeTo
Our Presentation
OnDetection and
analysis of Pesticides pollution
Learning outcomes: Definition of pesticides Definition of pesticides pollution. Causes of pesticides Types of analysis and detection Importance of pesticide pollution
detection and analysis
What is pesticides ?
The term ‘pesticide’ is described as agrochemicals that are used to control and remove any pest that competes with human for food, destroys properties and carries diseases.The most harmful pesticides are organochlorine pesticides, namely aldrin , endrin, clordane, mirex, toxaphene and hexachlorobenzene.
What is pesticide pollution?
Pesticide pollution is a major environmental
Problem. The chemicals found in pesticides
cause pollution when they get into contact with
soil, water and air. The chemicals normally bring
mostly negative impacts to the environment.
Many of them are considered to be
particularly hazardous compounds and toxic
because they inhibit fundamental metabolic
pathways .
Causes of pesticides pollution By running off agricultural fields to
nearby water sources during rainfall. Not all of the applied chemicals reach
the target sites. Some chemicals go deep into the soil
and take many time to be broken down Improper storing, mixing, and loading
of pesticides . Improper storing, mixing, and loading
of pesticides .
Detection and analysis can be carried out by using:
A gas chromatography with a atomic emission detector
A detector switching system A Biosensor
Pesticide analysis by gas chromatography with atomic emission detector.
An atomic emission detector, consists of a microwave-induced helium plasma and atomic emission spectrometer.
Detect any element in the periodic table (except helium) from a gas chromatography.
It is used for the detection and elemental characterization of 27 different pesticides.
A detector switching system There are two types of detector namely selective
detector and multiple detector. A selective detector is effective for impurity
components derived from agricultural crops. A multiple detector is required for the selective
detector of all pesticides components. The system obtain accurate analytical
information with no deterioration in sensitivity.
An example of an analysis by detector switching
ECD and FCD
Electron Capture detector (ECD) ECD offers high sensitivity analysis
of chlorinated pesticides.
Flame Photometric Detector (FPD) FPD detects organophosphate
pesticides.
Enzyme based Biosensor Biosensors are potentially useful as they detect pesticides
quickly and have been active in the research area for some years.
Examples of enzymes used by the biosensors are cholinesterase, aldehyde dehydrogenase,
acetolactate synthase and ascorbate oxidase. Biosensors have been defined as analytical devices which
tightly combine bio-recognition elements (enzyme, antibody, microorganism or DNA) with
physical transducers for detection of the target compounds.
The enzyme-based sensors measure the rate of the enzyme-catalyzed reaction as the basis for their response, any physical measurement which yields a quantity related to this rate can be used for detection.
Picture of a biosensor
Importance of pesticides pollution analysis and detection
Overdose of pesticides may cause resistant pest and decrease biodiversity in soil.
It gets wash away accidentally in waterways due to heavy rainfall thus causing water pollution.(eutrophication)
Pesticides contributes to air pollution. It occurs when pesticides that are applied to crops blow by winds in certain areas, potentially posing a threat to wildlife.
Questions
The presentation is presented by:
Soobhun.M FaadilCashimir Robinson
Thank You