Sensor to detect pesticides

Hi...
I would like to develop a sensor, which could identify the pesticides present in water...
is it possible ? if so..please guide me..
tnq.

“ Hi...
I would like to develop a sensor, which could identify the pesticides present in water...
is it possible ? if so..please guide me..
tnq.”

Please ‘do not’ hijack other people’s threads.

By the sounds of it, you need to walk before you run.

Study and go through all the Arduino examples before you ask this question.

First, you need to be able to identify when a substance is a pesticide and when it is a natural occurring substance.

Paul

It's called a gas chromatograph with mass spectrometer, but I'm not sure what part of a $50,000 machine might require an Arduino. :grinning:

"I would like to develop a sensor, which could identify the pesticides present in water...
is it possible ? if so..please guide me.."

You will probably need the help of an advanced chemistry expert/engineer to develop your device before adapting it to an arduino.

Paul__B:
It's called a gas chromatograph with mass spectrometer, but I'm not sure what part of a $50,000 machine might require an Arduino. :grinning:

Have those things become that cheap nowadays?

Anyway it's not going to help you much when it comes to pesticides, as it doesn't tell you with certainty which compound there is. It should give you some good clues of what exactly to look for.

Then some specialised chemical testing, with one test per target compound.

All in all not an Arduino project.

I am chemist, so let me help You a bit.
You have not defined whis pesticide You need to track, please done it for first.
There are several cheeper methodes to done the job, a HPLC and GC are the to expensive.
From optical methodes, You can use spectrofotometry, but You need to known the adsorbance maximum wave legnth. If the pestice have no chomophoras (chemical that are important for adsorpcion), You can make derivatisation, so it mean You ad an other chemical, that bonds to this pesticide and after this make an adsorbtion on any wave lenght.
From electrochemical methodes, You can make a sensor. I working a lot with biosensors, they have an enzymatic layer that make oxidation/reduction and i can whatch the process with electro messuring. I use chronoamperometry because is more specific. At this way have i designed an electrode for messuring glucose in human blood.

emilr:
I working a lot with biosensors, they have an enzymatic layer that make oxidation/reduction and i can whatch the process with electro messuring. I use chronoamperometry because is more specific. At this way have i designed an electrode for messuring glucose in human blood.

So the equipment with which you are working is overall, vastly more expensive than the HPLC and GC. :roll_eyes:

Paul__B:
So the equipment with which you are working is overall, vastly more expensive than the HPLC and GC. :roll_eyes:

Is not.

A solid HPLC with diode array detector (DAD) cost about 20k Euro. A GC is more expensive, depending on detector, it can be from 20k EUR up to 2-3 milion Euro.
A potentiostat cost about 100 euro, can be controled with Arduino. The LMP91000 from TI is so one.
https://eu.mouser.com/ProductDetail/Texas-Instruments/LMP91000EVM-NOPB?qs=YvhBCnANyPsgBL6nqn1SdQ%3D%3D

Also, the controlling software for Arduino Lib:
https://github.com/LinnesLab/LMP91000

For 100 euro for potentiostat and maybe aditional 50 euros for electrodes You can have a lot of “chemical fun”.

emilr:
For 100 euro for potentiostat and maybe aditional 50 euros for electrodes You can have a lot of "chemical fun".

Electrodes for specific pesticides you mean? Available off the shelf, with sensitivity that makes sense to measure trace residue levels in vegetables?

wvmarle:
Electrodes for specific pesticides you mean? Available off the shelf, with sensitivity that makes sense to measure trace residue levels in vegetables?

An reference electrode cost about 20 euro on ebay, a counter electrode can be an platin wire (about 10 euro).
The working electrode need to be designed, and this is a reason why i asked about the pesticide.
For design of working electrode, You can use a carbone paste electrodes with modifier.
If You known what type of pesticide You will messure, go to scientific search engines, like sciencedirect, webofscience or scopus and search for electrochemical determinantion of the pesticide you search.

Quite a few years ago there was someone who used leds as light sensors to measure colors absorbed by liquids in a rough way that worked for him. He was patenting the design to try and sell to Homeland Security.

What he made was able to profile transparent liquids in clear bottles, water from soap from soda from whatever.

Or you could get a water sample, put insects in and see if they die.

GoForSmoke:
Quite a few years ago there was someone who used leds as light sensors to measure colors absorbed by liquids in a rough way that worked for him. He was patenting the design to try and sell to Homeland Security.

What he made was able to profile transparent liquids in clear bottles, water from soap from soda from whatever.

Or you could get a water sample, put insects in and see if they die.

Optical methods are good, but the problem is the matrix. If You measure pesticide in clear water, is fine, but if You need to work with fruit juice, is much harder.
For the first, we need to known:

  • which pesticide
  • which matrix (medium where is this pesticide, tap water, fruit juice, etc)

vijaycfsl:
Hi...
I would like to develop a sensor, which could identify the pesticides present in water...
is it possible ? if so..please guide me..
tnq.

If is this a tap water, is not so a hard think. The ground water is also a simple matrix. If is a river/sea water is much more harder, in this type of water is a pretreatment needed because is more organic materials in this. Also, sea water have a high concentration of salt and this is a higher problem for potentiostat. For optical methods is this not a so big thing.
The next think is a pesticide. there are thousands of this, organic and inorganic.

If this person has a preferred source then the project won't be as hard as handle-everything-that-can-be-called-water.

I'd rather hear from the OP.

I think we all missed the point. A pesticide classification is how something is used to kill pests, not a chemical description. Table salt is a pesticide when used to kill slugs. Spray carb cleaner is a pesticide when used to kill wasps. A mouse trap is a pesticide when used to kill mice.

Lots of plant products are pesticides when used to kill insects.

Paul

But perfectly okay to gene-splice into food with us as the beta testers.