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Method for synchronously extracting and determining concentrations of sulfate ions and sulfide ions in environmental medium based on DGT technology and application

A sulfate ion, environmental medium technology, applied in the sulfide ion concentration, based on DGT technology to extract and measure sulfate in environmental medium synchronously, can solve problems such as patent publications that have not been found, and achieve improved detection efficiency and convenient and efficient cleaning. Easy to remove and easy to operate

Active Publication Date: 2021-03-19
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI +1
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  • Summary
  • 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 for synchronously extracting and determining concentrations of sulfate ions and sulfide ions in environmental medium based on DGT technology and application
  • Method for synchronously extracting and determining concentrations of sulfate ions and sulfide ions in environmental medium based on DGT technology and application
  • Method for synchronously extracting and determining concentrations of sulfate ions and sulfide ions in environmental medium based on DGT technology and application

Examples

Experimental program
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Effect test

Embodiment 1

[0061]According to the method for synchronously measuring sulfate radicals and sulfide ions in environmental media based on the DGT technology of the present invention, the time-varying graph of sulfate radicals and sulfide ions in soil at different depths under flooding conditions is measured. Select 5kg of Hunan acidic soil that has passed through a 2mm sieve and fill it in a 6L round bucket. S -NO 3 The strip DGT devices of the membrane were inserted into the 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 window 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 and measured, and the accumulated concentration in the binding membrane is obtained. The a...

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, the concentrations of sulfate ions and sulfide ions are both 50 μg / L, and the nitrate ion strength is 0.01mol / L. The specific operation is as follows: place the fabricated circular DGT devices in different pH values ​​of Na 2 S solution, K 2 SO 4 solution for 6h, then take out the binding membrane in the device, which is placed in K 2 SO 4 Bound the membrane in solution with 9 mL of 0.5 M HNO 3 Eluted for 20min, placed in Na 2 S solution for bound membrane with 9 mL 0.5M HNO 3 -1M H 2 o 2 Eluted for 20min (the adsorbed sulfide was eluted and converted into sulfate ion form), extracted an appropriate amount of extract and diluted 30 times, and then used ion chromatography to measure the concentration of sulfate and sulfide ions in the eluent, and then according to The formula calculates the concentration determined b...

Embodiment 3

[0079] Configure Na with different ionic strength 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 ion and sulfide ion is 50 μg / L, and the pH is 5.5. The specific operation is as follows: place the fabricated circular DGT devices in Na 2 S solution, K 2 SO 4 In the solution for 6h, then remove the binding membrane in the device. The determination steps are basically the same as in Example 2. The result is as Figure 5 As shown, except for the ionic strength of 0.001 and 0.7mol / L, the ratios are all between 1.0±0.1, indicating that DGT can be applied in the environment with an ionic strength of 0.005-0.1mol / L.

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Abstract

The invention relates to a method for synchronously extracting and determining concentrations of sulfate and sulfide ions in an environmental medium based on a DGT technology. The method comprises thefollowing steps of: by using a layered double hydroxide polyacrylamide gel film as a binding film, assembling a double-sided DGT device with the same binding film, putting the double-sided DGT deviceinto soil, a water body and sediments to adsorb sulfate and sulfide; taking out the two binding films in the DGT device, respectively eluting the binding films by adopting two eluents; diluting an extracting solution, and determining the concentration of sulfate ions by using ion chromatography, and obtaining the concentration of sulfide ions in the extracting solution by using a subtraction method; and finally separately calculating the concentrations of the sulfate ions and sulfide ions in the binding film according to a Fick's first diffusion law. The determination method is simplified; the concentration of the sulfide ions can be obtained only by determining the sulfate ions through the subtraction method, the complexity of different extraction methods and different devices during detection is avoided, and the detection efficiency and convenience are improved.

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 synchronously extracting and measuring the concentrations of sulfate radicals and sulfide ions in environmental media based on DGT technology. Background technique [0002] Sulfur is widely distributed in the natural environment and exists in various forms. The main sulfur in water and soil is mainly sulfate and sulfide. Sulphate 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; in oilfield sewage , Sulfate is reduced to S(-II) under the condition of reducing bacteria, S(-II) is corrosive, and i...

Claims

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Application Information

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Patent Type & Authority Applications(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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