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Method for measuring hydrogen sulfide by using headspace single-drop liquid-phase micro-extraction method and smart device colorimetric method

A smart device and hydrogen sulfide technology, applied in the field of hydrogen sulfide detection, can solve the problems of inconvenient and expensive acquisition, and achieve the effects of high stability, less process and simple operation

Active Publication Date: 2019-06-28
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, these detectors are application-specific, relatively expensive, and not readily available

Method used

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  • Method for measuring hydrogen sulfide by using headspace single-drop liquid-phase micro-extraction method and smart device colorimetric method
  • Method for measuring hydrogen sulfide by using headspace single-drop liquid-phase micro-extraction method and smart device colorimetric method
  • Method for measuring hydrogen sulfide by using headspace single-drop liquid-phase micro-extraction method and smart device colorimetric method

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1 Utilize headspace single drop liquid phase microextraction method and the method for colorimetric determination hydrogen sulfide of intelligent equipment

[0043] (1) Take a 50mL beaker, add 40μL silver nitrate (0.1M), 600μL sodium citrate (0.1M), 112μL hydrogen peroxide (30%), add deionized water to 39.6mL, use a magnetic stirrer, and quickly Stir for 10min, then quickly add 400μL NaBH 4 (0.1M), while stopping stirring, the solution will form a light yellow solution at this time. After 1-2min, the solution gradually changed from yellow to red, green, and blue, indicating that the preparation of Ag TNS was completed. After centrifugation, wash 3 times with deionized water and store in the dark at 4°C before use.

[0044] (2) The prepared Ag TNS (20mL) was washed by centrifugation and redispersed in 4.5mL deionized water, and the Ag TNS was grown horizontally and vertically. The method was as follows: add 500μL of PVP (the ), 18.7 μL of ascorbic acid (0.5...

Embodiment 2

[0056] H in embodiment 2 milk 2 S detection example:

[0057] To detect H in milk 2 The change trend of S content, the H in fresh milk samples 2 S was assayed and monitored continuously for 10 days. The fresh milk purchased directly from the supermarket was stored in two beakers, which were stored in a 4°C refrigerator and at a room temperature of 25°C. Using a UV-Vis spectrophotometer to measure the experimental data, get the H in milk 2 The change trend chart of S within 10 days, as attached Figure 11 . To assess matrix effects, these samples were spiked with 0.02 μM, 0.2 μM and 2 μM H 2 S, detected by UV-Vis spectrophotometer; adding 0.2μM, 2μM and 20μM, H 2 S was detected by smartphone nanocolorimetry. The results are shown in Tables 1 and 2 respectively, and a good recovery rate (97-105%) was obtained. HS-SDME completely avoids the problem of matrix interference, and its measured data and calculation method are similar to those of H in aqueous solution. 2 S mea...

Embodiment 3

[0063] Example 3 H in eggs 2 S detection example:

[0064] To detect H in eggs 2The change trend of S content, for H in egg samples 2 S was assayed and monitored continuously for 10 days. Eggs purchased directly from supermarkets were stored in a refrigerator at 4°C and at a room temperature of 25°C. Open a skylight with a diameter of 5mm at one end of the eggshell. Measure the experimental data with a UV-Vis spectrophotometer to obtain the H in eggs 2 The change trend chart of S within 10 days, as attached Figure 12 . To assess matrix effects, these samples were spiked with 0.02 μM, 0.2 μM and 2 μM H 2 S, detected by UV-Vis spectrophotometer; adding 0.2μM, 2μM and 20μM, H 2 S was detected by smartphone nanocolorimetry. The results are shown in Table 3 and 4 respectively, and a good recovery rate (95-104%) was obtained.

[0065] Table 3 Determination of the content of acid-labile sulfide added in egg samples by HS-SDME-UV-vis method

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[0067]

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Abstract

The invention discloses a method for measuring hydrogen sulfide by using a headspace single-drop liquid-phase micro-extraction method and a smart device colorimetric method. The method comprises: witha silver-gold core-shell triangular nano-flakes (Ag@Au TNS) as a nanometer detection probe, H2S volatilized in a to-be-measured sample is processed by specific extraction by the nanometer detection probe by combining a headspace single-drop liquid-phase micro-extraction method (HS-SDME) analysis method; and for the extracted sample, the H2S is detected by using a smart device shooting function and color extraction software. Compared with the prior art, the method has the following beneficial effects: with the smart device colorimetric method, the detection limit is about 65nM and the linear range is 0.1 to 100 microns. The established method can be used for measuring the H2S in an actual opaque sample like egg white or milk and has advantages of less process, simple operation and high detection efficiency.

Description

technical field [0001] The invention relates to a method for colorimetrically measuring hydrogen sulfide by using a headspace single-drop liquid-phase microextraction method and an intelligent device, and belongs to the technical field of hydrogen sulfide detection. Background technique [0002] Hydrogen sulfide (H 2 S) is a colorless acidic gas with a characteristic odor of rotten eggs. It is understood that the food processing industry, coal gasification plant, and crude oil refining process can produce H 2 S. It is the third toxic gas signaling molecule after nitric oxide and carbon monoxide. It plays an important pathophysiological role in many cardiovascular diseases, such as cardiac ischemia, vasodilation and neuromodulation. There is increasing evidence that H 2 Abnormal levels of S are strongly associated with diabetes, Alzheimer's disease and Down's syndrome. When the concentration of hydrogen sulfide rises to 15ppm, people exposed to it will lose consciousnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01G01N1/28
CPCG01N1/28G01N33/04G01N21/783G01N1/2214G01N21/33G01N2001/2217G01N2001/2229
Inventor 唐盛祁桐许孟婵许孟媛朱安妮沈薇
Owner JIANGSU UNIV OF SCI & TECH
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