A COLORIMETRIC SENSOR FOR DETERMINATION OF ETHION BY GOLD NANOPARTICLES

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eslami firuzabadi Zahra; SAEIDI MAHBOUBEH

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Seminar: IRANIAN CHEMISTRY CONGRESS
Year:2014 | Issue:17

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Title

A COLORIMETRIC SENSOR FOR DETERMINATION OF ETHION BY GOLD NANOPARTICLES

Author(s)

eslami firuzabadi Zahra | SAEIDI MAHBOUBEH | Issue Writer Certificate

Keywords

COLORIMETRIC DETECTION

ETHION

GOLD NANOPARTICLES

PESTICIDES

Abstract

BACKGROUND: WITH CITRATE-COATED AU NANOPARTICLES AS COLORIMETRIC PROBE, A NOVEL VISUAL METHOD FOR RAPID ASSAY OF ORGANOPHOSPHORUS PESTICIDES HAS BEEN DEVELOPED. THE ORIGINAL PLASMON ABSORPTION OF AU NANOPARTICLES AT 522 NM [1]. THE AUNPS WERE PREPARED BY REDUCTION OF HAUCL4.3H2O WITH TRI-SODIUM CITRATE IN AQUEOUS SOLUTION ACCORDING TO A SIMPLE APPROACH. AUNPS WHICH HIGHLY DISPERSED AND STABLE IN SOLUTION BY CHARGED CITRATE IONS ON THEIR SURFACE SHOULD EXHIBIT ONLY A SINGLE PEAK AT 521 NM, WHOSE COLOR IS RED [2].THE PRESENCE OF PESTICIDE RESIDUES IN FOOD, WATER AND SOIL CURRENTLY REPRESENTS ONE OF THE MAJOR ISSUES FOR THE ENVIRONMENTAL CHEMISTRY. ORGANOPHOSPHORUS COMPOUNDS (OPS) WITH A THIOPHOSPHORYL FUNCTIONAL GROUP (P=S) CONSTITUTE A BROAD CLASS OF WIDELY USED PESTICIDES. THESE COMPOUNDS ARE POWERFUL INHIBITORS OF CHOLINESTERASE ENZYMES (CHE) AND EFFECTIVELY PREVENT NERVE TRANSMISSION BY BLOCKING BREAKDOWN OF THE TRANSMITTER CHOLINE (CH) WHICH OFTEN RESULTING IN RESPIRATORY PARALYSIS AND DEATH.ETHION (O, O, O′, O′-TETRAETHYL S, S′- METHYLENE BIS (PHOSPHORO-DITHIOATE) IS ONE OF THE WIDELY USED OPS FOR CONTROL OF APHIDS, SPIDER MITES AND INSECTS ON A WIDE VARIETY OF FOOD, FIBER, AND CROPS [3].METHODS: IN THIS WORK, AUNPS WAS SYNTHESIZED AND A PRACTICAL AND ECONOMY METHOD FOR DETECTION OF ETHION BY AU NANOPARTICLES HAS BEEN DEVELOPED. WHEN ETHION WAS ADDED, INDUCES THE AGGREGATION OF AUNPS, THIS RESULTING IN A COLOR CHANGE FROM RED TO BLUE OR PURPLE THAT WE CAN BE OBSERVED BY THE NAKED EYES AND SHOW TWO MAXIMA ABSORPTION BAND IN 522 AND 649 NM BUT FOR INCREASING SENSITIVITY THE CONCENTRATION OF ETHION WAS QUANTIFIED BY ABSORPTION RATIO (A649/A522).RESULTS: THE EFFECT OF DIFFERENT PARAMETERS SUCH AS EFFECT OF ACIDITY, IONIC STRENGTH, EFFECT OF BUFFER, AUNPS CONCENTRATION AND TIME INVESTIGATED AND AND UNDER OPTIMIZED CONDITIONS, THE ETHION WAS DETECTED IN THE PRESENCE OF 0.01 M HYDROCHLORIC ACID, 0.1M SODIUM CHLORIDE AND BUFFER WITH PH=5.00 IN THE CONCENTRATION RANGE OF 0.5-2.5 MGL-1, RESPECTIVELY, WITH DETECTION LIMITS OF 6.5958×10-3, 2.4807×10-3, 9.2698×10-4 RESPECTIVELY.CONCLUSION: A SENSITIVE METHOD HAS BEEN PROPOSED FOR COLORIMETRIC DETECTION OF ETHION COLORIMETRIC BASED ON COLOR CHANGE CAUSED BY AGGREGATION OF THE PARTICLES IN THE SOLUTION OF GOLD NANOPARTICLES (AUNPS).

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APA: Copy

eslami firuzabadi, Zahra, & SAEIDI, MAHBOUBEH. (2014). A COLORIMETRIC SENSOR FOR DETERMINATION OF ETHION BY GOLD NANOPARTICLES. IRANIAN CHEMISTRY CONGRESS. SID. https://sid.ir/paper/912521/en

Vancouver: Copy

eslami firuzabadi Zahra, SAEIDI MAHBOUBEH. A COLORIMETRIC SENSOR FOR DETERMINATION OF ETHION BY GOLD NANOPARTICLES. 2014. Available from: https://sid.ir/paper/912521/en

IEEE: Copy

Zahra eslami firuzabadi, and MAHBOUBEH SAEIDI, “A COLORIMETRIC SENSOR FOR DETERMINATION OF ETHION BY GOLD NANOPARTICLES,” presented at the IRANIAN CHEMISTRY CONGRESS. 2014, [Online]. Available: https://sid.ir/paper/912521/en

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