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Method for rapidly detecting TNT in water based on surface-enhanced Raman spectroscopy

A surface-enhanced Raman and spectral detection technology, applied in Raman scattering, measurement devices, material analysis by optical means, etc., can solve problems such as the inability to achieve simple and fast detection of TNT, complex preprocessing, and bulky instruments. Achieve the effect of short detection time, simple pretreatment and low detection cost

Active Publication Date: 2018-11-16
启东科赛尔纳米科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages, but there are constraints such as bulky and expensive instruments, complicated pre-treatment, and the need for well-trained technicians to operate, so simple and rapid detection of TNT cannot be achieved.

Method used

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  • Method for rapidly detecting TNT in water based on surface-enhanced Raman spectroscopy
  • Method for rapidly detecting TNT in water based on surface-enhanced Raman spectroscopy
  • Method for rapidly detecting TNT in water based on surface-enhanced Raman spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the detection of TNT in lake water

[0038] Pre-treatment: take 5mL lake water sample and centrifuge at 8000r / min for 5min in a centrifuge, take 1mL supernatant and add 10μL of 25% hydrazine hydrate solution, mix well, add TNT standard solution so that the concentration of TNT in the sample solution to be tested is 0.3mg / min L;

[0039] Detection: Take 100 μL of the sample solution to be tested, add 50 μL of 1M sodium chloride aqueous solution, add 400 μL of nano-gold sol and mix evenly, scan parameters in the Raman spectrometer: excitation light source 785nm, laser power 500mW, scanning time 2000ms; put the sample bottle into the Raman spectrometer In the sample cell of the Mann detector, the Raman spectrum of the sample is obtained. Compare the spectrum of the sample with the standard spectrum, and use whether the characteristic peaks can be observed as the basis for detection.

[0040] Figure 4 It is the TNT test pattern in the lake water of embodimen...

Embodiment 2

[0041] Embodiment 2: the detection of TNT in seawater

[0042] Consistent with the treatment method in Example 1, the standard was added so that the concentration of TNT in the sample solution to be tested was 0.5 mg / L. Figure 5 It is the TNT test pattern in the sea water of embodiment 2. Sample source: Xiamen University Baicheng seawater spiked samples.

Embodiment 3

[0043] Embodiment 3: the detection of TNT in tap water

[0044] Consistent with the treatment method in Example 1, the standard was added so that the concentration of TNT in the sample solution to be tested was 0.05 mg / L. Figure 6 It is the TNT test pattern in the tap water of embodiment 3. Sample source: Xiamen tap water spiked sample.

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Abstract

A method for rapidly detecting TNT in water based on surface-enhanced Raman spectroscopy relates to a Raman spectroscopy detection method. The method of the invention comprises the following steps: synthesis of gold nanoparticles; molecular modification of TNT; surface-enhanced Raman spectroscopy detection of TNT standard substances; and detection of samples. The pretreatment is simple, instrumentoperation is simple, and the detection can be realized without a professional; the detection time is short, the instrument is convenient, and the on-site rapid detection is convenient; the accuracy is high, the detection cost is low, and the detection limit is low.

Description

technical field [0001] The invention relates to a Raman spectrum detection method, in particular to a method for rapidly detecting TNT in water based on a surface-enhanced Raman spectrum. Background technique [0002] In the 1970s, Van Duyne et al. found that the Raman signal of the molecules to be measured adsorbed on the surface of rough gold-silver nanomaterials could be enhanced10 6 above. This discovery gradually developed into a new technique, Surface-Enhanced Raman Spectroscopy (SERS). SERS can provide fingerprint information at the molecular level to determine the fine structure of the molecule to be detected. It overcomes the shortcomings of low sensitivity of traditional Raman spectroscopy, has extremely high sensitivity, can realize the detection of trace substances, and can even reach the detection level of single molecules under optimized conditions. At the same time, SERS also has the advantages of no need for sample pretreatment (or simple pretreatment), fa...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李剑锋黄艺伟金志平
Owner 启东科赛尔纳米科技有限公司
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