研究目的
Developing a new optical sensor for formaldehyde quantification in aqueous solutions, specifically in milk, to detect adulteration.
研究成果
The developed optical sensor is an effective, low-cost, and easy-to-use alternative for formaldehyde determination in milk, with detection and quantification limits close to those of conventional methods. It does not require a heating step, offering a practical advantage for field applications.
研究不足
The study did not explore the sensor's performance over extended periods beyond eight days or under varying environmental conditions. The precision of the optical sensor method was slightly lower than the conventional spectrophotometric method.
1：Experimental Design and Method Selection:
The study involved the development of an optical sensor using a polyoxometalate salt-coated optical fibre. The sensor's response to formaldehyde was measured through changes in UV-Vis spectrum.
2：Sample Selection and Data Sources:
Commercial and powder milk samples were used, with formaldehyde content analyzed both by the new sensor and a conventional spectrophotometric method.
3：List of Experimental Equipment and Materials:
Optical fibre, polyoxometalate salt [(C4H9)4N]4H[PMo10V2O40], PVC/NPOE membrane, UV-Vis light source, spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The optical fibre was coated with the polyoxometalate salt, and its response to formaldehyde in milk samples was measured. Comparative analysis was performed using the acetylacetone spectrophotometric method.
5：Data Analysis Methods:
Statistical comparison of results from the optical sensor and the conventional method was conducted using paired t-tests and F-tests.
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