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Method for rapidly determining weathering activation energy of metal sulfide mineral in soil

A metal sulfide and activation energy technology, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of cumbersome operation, many calculation steps, long time consumption, etc., to avoid reaction errors, low experimental cost, Simple to use effects

Active Publication Date: 2020-10-02
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] Because the method for determining the activation energy in the prior art needs to determine the reaction process by observing the change of the color of the reaction solution, the influence of human factors in the actual operation process is relatively large, so it is very easy to cause reaction errors; in addition, the calculation steps in the activation energy determination process Too much, the operation is cumbersome, and the multiple accumulation of each step of the experimental error will further expand the error. When used in the determination of activation energy, the applicability is poor; at the same time, due to the particularity of the weathering of metal sulfide minerals in soil, it is necessary to Perform rapid determination, while the activation energy determination method in the prior art usually takes a long time and cannot achieve rapid determination

Method used

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  • Method for rapidly determining weathering activation energy of metal sulfide mineral in soil
  • Method for rapidly determining weathering activation energy of metal sulfide mineral in soil
  • Method for rapidly determining weathering activation energy of metal sulfide mineral in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] (1) Fabrication of metal sulfide mineral electrodes

[0094] The pure and dense massive pyrite sample was cut to a suitable size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the pyrite sample is cut into a cube of 0.5 cm×0.5 cm×0.5 cm. After the copper wire is connected to the upper surface of the pyrite cube, the pyrite cube is sealed and poured with epoxy resin, so that only the bottom surface of the pyrite cube communicates with the outside world to obtain a pyrite electrode.

[0095] (2) Preparation of soil solution

[0096] Weigh 10.02 g of the air-dried meadow soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 Mix 25ml of ultrapure water with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0097] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0098] a. Use 1200 mesh, 3000 mesh and 5000 mesh sandp...

Embodiment 2

[0105] (1) Fabrication of metal sulfide mineral electrodes

[0106] The pure and dense massive pyrite sample was cut to a suitable size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the pyrite sample is cut into a cuboid of 0.5 cm×0.5 cm×0.8 cm. After the copper wire is connected to the upper surface of the pyrite cuboid (0.5cm×0.5cm), epoxy resin is used to seal and cast the pyrite cuboid so that only the bottom surface of the pyrite cuboid (0.5cm×0.5cm) Connect with the outside world to get a pyrite electrode.

[0107] (2) Preparation of soil solution

[0108] Weigh 10.02 g of the air-dried saline-alkali soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 25ml of ultrapure water was stirred with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0109] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0110] a. Us...

Embodiment 3

[0117] (1) Fabrication of metal sulfide mineral electrodes

[0118] The pure and dense massive arsenopyrite sample was cut to an appropriate size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the arsenopyrite sample is cut into a cube of 0.5 cm×0.5 cm×0.5 cm. After the copper wire is connected to the upper surface of the arsenopyrite cube, epoxy resin is used to seal and cast the arsenopyrite cube, so that only the bottom surface of the arsenopyrite cube communicates with the outside world to obtain the arsenopyrite electrode.

[0119] (2) Preparation of soil solution

[0120] Weigh 10.02 g of the air-dried meadow soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 Mix 25ml of ultrapure water with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0121] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0122] a. Use...

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Abstract

The invention discloses a method for rapidly determining weathering activation energy of a metal sulfide mineral in soil, and relates to the technical field of environmental protection. The method comprises the following steps: firstly, preparing an electrode from a metal sulfide mineral; preparing air-dried soil into a soil solution; carrying out an electrochemical polarization curve test of themetal sulfide mineral in the soil solution at different temperatures to obtain an electrochemical polarization curve of the metal sulfide mineral in the soil solution; carrying out Tafel extrapolationon the obtained curve to obtain the corrosion current density of the metal sulfide mineral in the soil solution; and calculating the weathering activation energy of the metal sulfide mineral in the soil according to the relational expression between the corrosion current density icorr and the temperature T. According to the determination method, the weathering activation energy of the metal sulfide mineral in the soil can be rapidly determined, meanwhile, the operation is simple, the experiment cost is low, and a theoretical basis is provided for determining the activation energy of the mineral in different soils.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for quickly measuring the weathering activation energy of metal sulfide minerals in soil. Background technique [0002] Soil is an important place for the enrichment and accumulation of heavy metals. At present, the problem of soil pollution has been paid more and more attention by the country. [0003] Meadow soil and saline-alkali soil are two common soils in my country. In my country, meadow soil is widely distributed, with an area of ​​about 25.0705 million hectares, mainly located in the plains or basins of Northeast China, Inner Mongolia and Northwest China. The total area of ​​saline-alkali land in my country is 99 million hectares, accounting for about 10.3% of the land area, mainly distributed in the northeast, northwest and North China, and growing at a rate of 1.5% every year [Lv Yizhong et al. Soil Science. China Agricultural Press, 2008.; W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
CPCG01N27/416
Inventor 刘庆友王帅冯晓楠郑凯
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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