Sulfide detection method

A detection method and sulfide technology, applied in the field of analytical chemistry, can solve problems such as the limitation of detection sensitivity of operation convenience, and achieve the effect of low detection limit, low detection limit and high sensitivity

Pending Publication Date: 2020-07-24
WUXI ZODOLABS BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method still has certain limitations in terms of operational convenience and detection sensitivity.

Method used

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  • Sulfide detection method
  • Sulfide detection method
  • Sulfide detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0069] This embodiment provides a method for detecting sulfide, which specifically includes the following steps:

[0070] (1) Dilute the sulfide (NaS) standard solution with a concentration of 100 mg / L purchased from the National Center for Standard Materials 10 times to obtain a standard solution with a concentration of 10 mg / L; take 5 mL of primary water, and add 10 μL of 10 mg / L to it / L of sodium sulfide standard solution to obtain a test solution with a concentration of 0.02 mg / L; take 5 mL of this test solution and mix it with 100 μL of derivatization reagent to rapidly generate derivatization products, i.e. methylene blue compounds;

[0071] (2) Take 100 μL of the derivatized product in the sample cell, then add 100 μL of Raman surface enhancer and 50 μL of coagulation accelerator, mix well and place it in a Raman spectrometer for detection, set the laser power to 100 mW, and the integration time to 500 ms, Get the Raman spectrum;

[0072] (3) In the Raman spectrum, th...

Embodiment 2

[0075] The difference between this embodiment and embodiment 1 is that in step (1), the sulfide concentration of the liquid to be tested is 0.04mg / L; figure 2 It is the Raman spectrum in this embodiment, wherein, 1 is the Raman spectrum line of the sample to be tested, and 2 is the Raman spectrum line of the blank control.

Embodiment 3

[0077] The difference between this embodiment and embodiment 1 is that in step (1), the sulfide concentration of the liquid to be tested is 0.08mg / L; image 3 It is the Raman spectrum in this embodiment, wherein, 1 is the Raman spectrum line of the sample to be tested, and 2 is the Raman spectrum line of the blank control.

[0078] Longitudinal comparison of the Raman spectrograms of Examples 1 to 3, it can be seen that under the same detection parameter setting, with the increase of the sulfide concentration in the liquid to be tested, the 453cm -1 and 483cm -1 The intensity of the characteristic peak at the position is also enhanced, which proves that the detection method provided by the present invention can also realize the quantitative detection of sulfide in water.

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Abstract

The invention provides a sulfide detection method. The detection method comprises the following steps: (1) mixing a liquid to be detected and a derivatization reagent, and carrying out a reaction to obtain a derivatization product; (2) mixing the derivatization product obtained in the step (1), a Raman surface enhancer and a coagulant, and performing detection in a Raman spectrometer to obtain a Raman spectrogram; and (3) analyzing the peak position and the peak intensity in the Raman spectrogram obtained in the step (2) to obtain a sulfide detection result. In the sulfide detection method, detecting, complex collection, pretreatment and storage processes of the sample to be detected are not needed, large-scale instruments are not needed, rapid, accurate and real-time detection of sulfidescan be realized, the detection limit is lower, the sensitivity is higher, the steps are more convenient, trace detection with the concentration of 0.02 mg/L can be realized, and the method is specially suitable for real-time and on-site detection of the sulfides in drinking water and other water bodies.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for detecting sulfides. Background technique [0002] Sulfur is a non-metallic element that usually exists in the form of sulfide, sulfate or simple substance in nature. Sulfide in water refers to soluble sulfide and acidic metal sulfide in water, including soluble H 2 S, HS - and S 2- . Sulphides mainly exist in domestic sewage, and some special underground hot springs also contain sulphides. [0003] Sulphides are highly toxic to humans and aquatic organisms. Sulfide can interact with cytochrome, oxidase and the disulfide bond in the above structure in the human body, affect the oxidation process of cells, cause hypoxia in cells and tissues, and endanger human life. In order to protect the life and health of the people, on July 1, 2007, the National Standards Committee and the Ministry of Health jointly issued the "Drinking Water Sanitati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/28
CPCG01N21/658G01N1/28
Inventor 张文涛朱华玲周丽邹晓兰任水英李林杨轶
Owner WUXI ZODOLABS BIOTECH
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