Related Experiment Video
Updated: Jan 26, 2026
07:58
A Polyaniline-based Sensor of Nucleic Acids
Published on: November 1, 2016
8.4K
Acid Environment-improved fluorescence sensing performance: A quinoline Schiff base-containing sensor for Cd2+ with
Xuejuan Wan1, Haoqi Ke1, Jiaoning Tang1
1Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China.
Talanta
|April 7, 2019
Summary
A novel quinoline-based Schiff base, AMQD, functions as a highly sensitive "turn-on" fluorescence sensor for cadmium ions (Cd2+). This sensor demonstrates superior selectivity and detection limits in acidic aqueous solutions, ideal for environmental monitoring.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Developing fluorescence sensors for heavy metals in acidic environments is crucial for water quality assessment.
- Existing sensors often lack sensitivity or selectivity in acidic conditions.
- Heavy metal contamination, particularly cadmium, poses significant environmental and health risks.
Purpose of the Study:
- To develop a highly sensitive and selective fluorescence sensor for cadmium ions (Cd2+) applicable in acidic environments.
- To investigate the sensing performance of a quinoline-containing Schiff base (AMQD) for Cd2+ detection.
- To evaluate the sensor's efficacy in acidic versus neutral conditions for real-world water analysis.
Main Methods:
- Synthesis of a quinoline-containing Schiff base, AMQD.
- Fluorescence spectroscopy was employed to detect Cd2+ in acidic (pH 4) and neutral aqueous solutions.
- Selectivity tests were performed using various interfering metal cations.
- Determination of the recognition ratio and detection limit for Cd2+.
Main Results:
- AMQD exhibited weak fluorescence in the absence of metal ions.
- Addition of Cd2+ resulted in a significant "turn-on" fluorescence response around 425 nm.
- The sensor showed enhanced sensitivity and selectivity for Cd2+ in acidic (pH 4) 10% methanol aqueous solution compared to neutral conditions.
- Excellent selectivity was observed, with no interference from other common metal cations.
- A 1:1 recognition ratio between AMQD and Cd2+ was established.
- A low detection limit of 2.4 nM for Cd2+ was achieved.
Conclusions:
- The synthesized AMQD acts as an effective "turn-on" fluorescence probe for sensitive and selective Cd2+ detection.
- The sensor's performance is significantly improved in acidic environments, making it suitable for natural water samples.
- This fluorescence sensor offers a promising tool for rapid and comprehensive evaluation of soluble cadmium in environmental water analysis.
More Related Videos
09:21Real Time Monitoring of Intracellular Bile Acid Dynamics Using a Genetically Encoded FRET-based Bile Acid Sensor
Published on: January 4, 2016
10.4K
10:28Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
Published on: March 24, 2023
2.5K
Related Concept Videos
02:33Lewis Acids and Bases
48.3K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
48.3K
02:54Ions as Acids and Bases
26.3K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.3K
02:23Acid-Base Titration Curves
140.8K
A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of...
For a titration carried out for 25.00 mL of...
140.8K
02:58Bronsted-Lowry Acids and Bases
104.4K
The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
104.4K
03:26Acids, Bases and Neutralization Reactions
63.7K
An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
63.7K
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
55.6K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
55.6K