Detection of trace nitrite in waters using a QDs-based chemiluminescence analysis system

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Chemiluminescence (CL) methods offer sensitive detection.
• Nitrite determination is crucial for environmental and food safety.

Purpose of the Study:

• To develop a novel flow-injection chemiluminescence method for sensitive nitrite detection.
• To utilize cadmium telluride quantum dots (CdTe QDs) as a CL enhancer.

Main Methods:

• A flow-injection system was designed using CdTe QDs and hydrogen peroxide (H2O2).
• Hemoglobin (Hb) was employed to enhance the CL signal.
• Nitrite's reaction with Hb led to the quenching of the CL signal, enabling quantification.

Main Results:

• The method demonstrated a wide linear range for nitrite detection (1.0 × 10⁻⁹ to 8.0 × 10⁻⁷ mol L⁻¹).
• A low limit of detection (3.0 × 10⁻¹⁰ mol L⁻¹) was achieved.
• The method was successfully validated for nitrite determination in real water samples.

Conclusions:

• The developed flow-injection CL method provides a sensitive and reliable approach for nitrite analysis.
• CdTe QDs in conjunction with Hb offer a promising platform for trace nitrite determination.