A highly sensitive solid substrate room temperature phosphorimetry for carbaryl detection based on its activating...

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Room temperature phosphorescence (RTP) offers sensitive detection methods.
• Developing selective and rapid analytical techniques for environmental contaminants is crucial.

Purpose of the Study:

• To establish a novel activating solid substrate room temperature phosphorimetry (SSRTP) method for carbaryl detection.
• To investigate the activation mechanism and quantify carbaryl in water samples.

Main Methods:

• Fluorescein (HFin) immobilized on polyamide membrane (PAM) with Pb(2+) as an ion perturber.
• Carbaryl-induced activation of NaIO4 oxidation of HFin, leading to RTP signal quenching.
• Utilizing infrared spectra (IR) to elucidate the reaction mechanism.

Main Results:

• The SSRTP system exhibited a sharp RTP signal quench in the presence of carbaryl.
• The phosphorescence intensity (ΔIp) of the activated system was 3.3 times higher than the non-activated system.
• The method demonstrated high sensitivity (LOQ = 2.0 × 10⁻¹³ g mL⁻¹), selectivity, and accuracy in water sample analysis.

Conclusions:

• The developed SSRTP method is sensitive, selective, simple, and rapid for trace carbaryl detection.
• The method's accuracy is validated by comparison with fluorimetry results.
• The study provides insights into the activation mechanism of SSRTP for carbaryl detection.