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System and device for automatically separating, enriching and detecting hydrogen sulfide in desulfurizing liquid and wastewater

A technology for automatic separation and desulfurization of liquid, applied in the direction of analysis of materials, color/spectral characteristic measurement, instruments, etc., can solve the problems of environmental pollution of color developer, complicated manual operation process, large error of measurement results, etc., to save resources, The effect of less dosage and easy operation of the device

Pending Publication Date: 2022-01-25
成都枫昀检测科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the measurement results are affected by the chromaticity and turbidity of the water sample, the manual operation process is complicated, the human error is large, the reagent consumption is large, and the chromogenic agent pollutes the environment
The common disadvantage of these methods is that for complex systems, colored or turbid samples, complex pretreatment must be carried out, otherwise the error of the measurement results will be large
The main problem is that the heavy metals in the synthesis of composite carbon dots will cause secondary pollution to the environment, and precious metals will lead to higher analysis costs

Method used

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  • System and device for automatically separating, enriching and detecting hydrogen sulfide in desulfurizing liquid and wastewater
  • System and device for automatically separating, enriching and detecting hydrogen sulfide in desulfurizing liquid and wastewater
  • System and device for automatically separating, enriching and detecting hydrogen sulfide in desulfurizing liquid and wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This example evaluates urea / CA-CDs and S 2- linear response between. figure 2 The curve shows that in the two ranges of 0.05~1.0 mg / L (A=-0.083c+0.84) and 1.0~15mg / L (A=-0.021c+0.76), S 2- exhibits a good linear correlation with the degree of extinction ( figure 2 b), when S 2- When the concentration reaches 15mg / L, the absorbance does not change any more. figure 2 The photographs in a also show that S 2- The concentration exhibited a good correlation with the color change of the carbon dots. The invention can meet the requirements of national waste water sulfide (0.856mg / L) or drinking water sulfide content (0.480mg / L) determination required by the World Health Organization; the invention can also be used for high-concentration sulfide determination through dilution.

Embodiment 2

[0055] This example evaluates the quantitative S of urea / CA-CDs 2- optimum acidity. The CDs concentration is set to 100mg / L; adjust the acidity of the reaction solution with PBS, 1mmol / L S 2- The standard solution was used as a test sample, and according to the absorbance values ​​before and after the addition of CDs, the following results were obtained: image 3 The columnar curve shown. image 3 a shows that the pH of the reaction solution is different, and the CDs are replaced by S 2- The degree of fading also varies; image 3 b shows: when pH7~8, S 2- The degree of fading is maximized (maximum ΔA value). Because the reaction solution is easily affected by CO2 in the environment when the pH is 7, the pH is selected as 8.

Embodiment 3

[0057] In this embodiment, under the above-mentioned selected conditions, the effect of reaction temperature on urea / CA-CDs and S 2- The effect of fading reaction. The curve of the obtained absorbance difference versus temperature is shown in Figure 4 . Obviously, the CDs with S 2- The fading reaction system has the largest absorbance difference at room temperature (23-28°C), and the fading effect is the best. Therefore, using the assay of the present invention, S 2- , the temperature of the reaction system is selected within the room temperature range.

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Abstract

The invention discloses a carbon dot fading probe method for high-sensitivity determination of hydrogen sulfide or sulfur ions and a matched automatic separation pretreatment device, relates to rapid pretreatment and automatic determination of H2S content in natural gas desulfurization rich liquor and barren liquor and soluble sulfide content in various wastewater samples, and belongs to the field of desulfurization process rapid control and environmental monitoring. The device can also be combined with various flow-type detectors for rapid, accurate and automatic determination of the content of various sulfides; the device is high in automation degree, good in reproducibility, nontoxic in carbon dot reagent and beneficial to environmental protection; and according to the device, interference of other substances is eliminated while the desulfurization liquid and the hydrogen sulfide are automatically separated, carrier gas, an oxidizing agent and the like are not needed in the process, and the aim of simplifying pretreatment of the H2S sample is achieved. The desorption temperature of the desulfurization liquid is 40-100 DEG C, the sample volume is 0.5-3 mL, the carbon dot concentration is 80-120 mg / L, the wavelength of the fading reaction is 610 nm, the pH value of the reaction system is 8, and the reaction temperature is room temperature.

Description

technical field [0001] The invention relates to H in the desulfurization rich liquid and lean liquid of natural gas wet desulfurization plant 2 The invention discloses a system and device for rapid pretreatment and automatic determination of S content and sulfide content in various waste water samples, belonging to the fields of rapid monitoring and control of desulfurization process, environmental detection and the like. The present invention can also be used in conjunction with a variety of flow-through detectors for various H 2 Fast, accurate and automatic determination of S content. Background technique [0002] Sulfide is an important chemical raw material and a harmful substance that pollutes the environment. For example, if the sulfur content of natural gas is too high, it will cause corrosion of gas transmission pipelines, and the combustion will form acid rain and pollute the air. Therefore, its sulfur content has become an important control index to measure the q...

Claims

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Application Information

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IPC IPC(8): G01N35/00G01N21/31G01N21/25
CPCG01N35/00G01N21/31G01N21/25
Inventor 李永生
Owner 成都枫昀检测科技有限公司
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