Method for rapidly detecting volatile formaldehyde by surface enhanced Raman scattering (SERS) and application of method

Abstract

The invention relates to construction of a portable purging and trapping sampling device of volatile formaldehyde, and a method for rapidly detecting volatile formaldehyde by surface enhanced Raman scattering (SERS) and application of the method. The portable purging and trapping sampling device of volatile formaldehyde comprises a gas path purging system and a sampling system. The volatile formaldehyde in an actual sample reacts with a derivatization reagent after being purged by high-purity nitrogen, an enhanced particle is added to a reactant and then the detection is carried out through a Raman spectrometer. The formaldehyde reacts with a phenol reagent under the action of ammonium ferric sulfate under the acidic condition to generate a blue-green compound, and an SERS signal of the blue-green compound is enhanced and is superior to that of the formaldehyde, so that the formaldehyde is subjected to indirect qualitation and quantitation through determining the blue-green compound. The portable purging and trapping sampling device adopts Au / SiO2 as an SERS base material, is suitable for determination of the volatile formaldehyde in complex samples such as aquatic products, foods and environment, and has the advantages of simpleness, rapidness, high selectivity, and the like, and is suitable for field detection.

Description

technical field [0001] The invention relates to a method for rapid detection of volatile formaldehyde by surface-enhanced Raman spectroscopy (Surface-enhancedRamanscattering, SERS), in particular to a method for rapid detection of volatile formaldehyde by SERS and its application, which is suitable for volatile formaldehyde in complex samples such as aquatic products, food, and the environment determination. Background technique [0002] Formaldehyde is colorless at room temperature and has a strong pungent odor. It is the simplest small molecule volatile organic compound, which can cause strong irritation to human eyes, skin, respiratory system, nervous system, etc., and has the risk of teratogenic and carcinogenic . [0003] Although formaldehyde can be used for antisepsis, long-term consumption of foods containing trace amounts of formaldehyde will pose a great hazard to human health. my country's "Food Hygiene Law" clearly stipulates that formaldehyde and formaldehyde-c...

AI Technical Summary

Problems solved by technology

Conventional formaldehyde analysis generally relies on large-scale spectroscopic and chromatographic instruments, which have high sensitivity and good accuracy, but the instruments and reagents used are expensive, the detection cost is high, the measurement of samples takes a long time, and the instrument is inconvenient to carry, so it is not suitable for rapid on-site analysis of formaldehyde

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