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Method and application of simultaneous extraction and determination of sulfate and sulfide ion concentrations in environmental media based on dgt technology

A sulfate ion and environmental medium technology, applied in the field of sulfide ion concentration, based on DGT technology to simultaneously extract and measure sulfate in environmental media, can solve problems such as patent publications that have not been found, and achieve improved detection efficiency, convenience, and convenient operation , the effect of high capacity

Active Publication Date: 2022-08-09
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Through the search, no patent publications related to the patent application of the present invention have been found

Method used

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  • Method and application of simultaneous extraction and determination of sulfate and sulfide ion concentrations in environmental media based on dgt technology
  • Method and application of simultaneous extraction and determination of sulfate and sulfide ion concentrations in environmental media based on dgt technology
  • Method and application of simultaneous extraction and determination of sulfate and sulfide ion concentrations in environmental media based on dgt technology

Examples

Experimental program
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Effect test

Embodiment 1

[0061]According to the method for synchronously measuring sulfate and sulfide ions in an environmental medium based on the DGT technology of the present invention, the graphs of sulfate and sulfide ions changing with time in soil at different depths under flooded conditions are measured. Select 5kg of Hunan acid soil that has passed a 2mm sieve and fill it in a 6L circular bucket. The soil surface is flat, add deionized water, maintain a 2cm flooded layer, and place the assembled double-sided LDH. S -NO 3 Membrane strips of DGT devices were inserted into soil on days 1, 3, 5, 7, 9, 11, and 16, respectively, where the upper 2 cm window of the DGT remained in the flooded layer, representing a soil depth of 0 cm, and the lower 15 cm of the DGT. The window is kept in the soil, and each 5cm depth represents the soil depth of 5cm, 10cm, and 15cm, respectively. After standing for 48 hours, the device is taken out, and the sulfate and sulfide ions on the binding membrane are eluted an...

Embodiment 2

[0077] Configure Na with different pH values 2 S solution, K 2 SO 4 Solution (pH values ​​are 4, 5, 6, 7, 8, 9), the total volume of the solution is 2L, in which the sulfate ion and sulfide ion concentrations are both 50 μg / L, and the nitrate ion strength is 0.01mol / L. The specific operation is as follows: the prepared circular DGT devices are placed in Na of different pH values ​​respectively. 2 S solution, K 2 SO 4 solution for 6h, then remove the binding membrane from the device, which is placed in K 2 SO 4 Bind the membrane in solution with 9 mL of 0.5 M HNO 3 Elution for 20min, placed in Na 2 Bind membrane of S solution with 9 mL of 0.5M HNO 3 -1M H 2 O 2 Elution for 20min (the adsorbed sulfide is converted into sulfate ion form after elution), extract an appropriate amount of the extract and dilute it by 30 times, and then use ion chromatography to measure the concentration of sulfate and sulfide ions in the eluent, and then according to The formula calculates...

Embodiment 3

[0079] Configure Na with different ionic strengths 2 S solution, K 2 SO 4 Solution (ionic strength: 0.001, 0.005, 0.01, 0.05, 0.1, 0.5mol / L), the total volume of the solution is 2L, the concentration of sulfate ions and sulfide ions are both 50 μg / L, and the pH is 5.5. The specific operation is as follows: the prepared circular DGT devices are placed in the Na of different ionic strengths respectively. 2 S solution, K 2 SO 4 in solution for 6 h, then remove the binding membrane from the device. The measurement steps are basically the same as those in Example 2. The result is as Figure 5 As shown, except for the ionic strengths of 0.001 and 0.7 mol / L, the ratios are all between 1.0 ± 0.1, indicating that DGT can be applied in an environment with an ionic strength of 0.005-0.1 mol / L.

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Abstract

The invention relates to a method for synchronously extracting and measuring the concentration of sulfate radicals and sulfide ions in an environmental medium based on DGT technology. The double-sided DGT device was put into the soil, water body and sediment to adsorb sulfate and sulfide, then the two binding membranes in the DGT device were taken out, and 2 kinds of eluents were used to elute respectively, and then the extract was diluted. The concentration of sulfate ions was simultaneously measured by ion chromatography, the concentration of sulfide ions in the extract was obtained by subtraction, and finally the concentrations of sulfate and sulfide ions in the binding membrane were calculated according to Fick's first law of diffusion. The method of the invention simplifies the measurement method, only needs to measure the sulfate ion, and obtains the sulfide ion concentration through the subtraction method, avoids the complexity of different extraction methods and different equipment during detection, and improves the detection efficiency and convenience.

Description

technical field [0001] The invention belongs to the technical field of simultaneous detection of specific sulfur form ions, in particular to a method and application for synchronous extraction and determination of sulfate and sulfide ion concentrations in an environmental medium based on DGT technology. Background technique [0002] Sulfur is widely distributed in the natural environment and exists in various forms. The sulfur of major concern in water and soil is mainly sulfate and sulfide. Sulfate concentrations in natural water can range from a few milligrams per liter to thousands of milligrams per liter. A small amount of sulfate in water has no effect on human health, but when the concentration of sulfate in the water exceeds 150mg / L, the water will have a bitter taste, and when the concentration exceeds 250mg / L, it will cause diarrhea in the human body; , Sulfate is reduced to S(-II) under the condition of reducing bacteria, S(-II) is corrosive, and the product is ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/14G01N30/34
CPCG01N30/02G01N30/06G01N30/14G01N30/34G01N2030/146Y02A20/20
Inventor 赵萌赵玉杰张富合刘潇威周其文刘荣乐
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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