Publication:
Novel colorimetric assay for paraquat detection on-silica bead using negatively charged silver nanoparticles

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Issued Date

2017

Resource Type

Article

File Type

application/pdf

ISSN

399140

DOI

10.1016/j.talanta.2017.06.045

Other identifier(s)

2-s2.0-85021165709

Rights Holder(s)

Scopus

Bibliographic Citation

Talanta. Vol 174, (2017), p.448-453

Suggested Citation

Siangproh W., Somboonsuk T., Chailapakul O., Songsrirote K. Novel colorimetric assay for paraquat detection on-silica bead using negatively charged silver nanoparticles. Talanta. Vol 174, (2017), p.448-453. doi:10.1016/j.talanta.2017.06.045 Retrieved from: https://hdl.handle.net/20.500.14740/4029

Title

Novel colorimetric assay for paraquat detection on-silica bead using negatively charged silver nanoparticles

Author(s)

Siangproh W.
 Somboonsuk T.
 Chailapakul O.
 Songsrirote K.

Abstract

A simple, rapid, sensitive, and economical method based on colorimetry for the determination of paraquat, a widely used herbicide, was developed. Citrate-coated silver nanoparticles (AgNPs) were synthesized as the colorimetric probe. The mechanism of the assay is related to the aggregation of negatively charged AgNPs as induced by positively-charged paraquat resulting from coulombic attraction which causes the color to change from a deep greenish yellow to pale yellow in accordance with the concentrations of paraquat. Silica gel was exploited as the paraquat adsorbent for purification and pre-concentration prior to the direct determination with negatively charged AgNPs without the requirement of the elution step. The validity of the proposed approach was evaluated by spiking standard paraquat in water and plant samples. Recoveries of paraquat in water samples were 93.6% and 95.4% for groundwater and canal water, respectively, while those in plant samples were 89.5% and 86.6% for Chinese cabbage and green apple, respectively,after using the optimized extraction procedure. The absorbance of AgNPs at 400 nm was linearly related to the concentration of paraquat over the range of 0.05–50 mg L−1, with detection limits of 0.05 mg L−1 for water samples, and 0.10 mg L−1 for plant samples by naked eye determination. © 2017 Elsevier B.V.

Subject(s)

Color
 Colorimeters
 Colorimetry
 Groundwater
 Metal nanoparticles
 Silica
 Silica gel
 Silver nanoparticles
 Synthesis (chemical)
 Coulombic attractions
 Direct determination
 Extraction procedure
 Nanopaticles
 Optical detection
 Paraquat
 Silica beads
 Silver nanoparticles (AgNps)
 Herbicides
 Metal nanoparticle
 Microsphere
 Paraquat
 Silicon dioxide
 Silver
 Water
 Brassica rapa
 Chemistry
 Colorimetry
 Limit of detection
 Procedures
 Brassica rapa
 Colorimetry
 Limit of Detection
 Metal Nanoparticles
 Microspheres
 Paraquat
 Silicon Dioxide
 Silver
 Water

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URI

https://hdl.handle.net/20.500.14740/4029

Collections

Scopus: Year 1983-2021

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