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A method and application of using dye indicator to test the surface pH of mineral samples

A technology of indicator and acid-base indicator, which is applied in the field of soil analysis, can solve problems such as no relevant research reports, and achieve the effect of low condition requirements, simple operation and strong adaptability

Active Publication Date: 2020-06-05
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, to achieve accurate detection of soil and mineral surface pH, many technical problems still need to be overcome; whether the method for detecting the surface acidity of agents in the prior art is also applicable to the surface acidity of soil solids has not been reported, and further innovation is needed. Research

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  • A method and application of using dye indicator to test the surface pH of mineral samples
  • A method and application of using dye indicator to test the surface pH of mineral samples
  • A method and application of using dye indicator to test the surface pH of mineral samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Solution preparation

[0059] Select six acid-base indicator dyes to form a pH range of 1.2-8.0, namely thymol blue (1.2-2.8), bromophenol blue (2.8-4.6), bromocresol green (3.8-5.4), Bromocresol purple (5.2-6.8), neutral red (6.8-7.8), phenol red (6.8-8.0). According to the working pH range of each indicator dye, add HCl (1M) and NaOH (1M) solutions dropwise to make indicator dye solutions with different pHs. The solvent is methanol / water solution with a mass ratio of 1:9, and the pH meter is used for testing.

[0060] 2. Drawing of indicator standard curve

[0061] The prepared solutions of different pH of the same indicator were added to the cuvette in turn, and the spectrum of the indicator dye solution was scanned by an ultraviolet-visible light spectrometer, with a scanning step of 1 nm and a wavelength range of 300 to 700 nm. Acid peaks (InH) and base peaks (InH) with different peak intensities at different pHs can be obtained - ) The diffuse reflectance sp...

Embodiment 2

[0069] The six acid-base indicator dyes in Example 1 were selected to form a pH variation range of 1.2 to 8.0. Select montmorillonite as the test mineral. In order to ensure that the weighed mineral samples can be completely colored, the volume-to-mass ratio (mL / g) of the solution to the mineral is optimized to 1.2, and the selected ratio of dyes is added to the mineral to make it to color. Spread it evenly with a glass rod and dry it at 40°C for 1 hour. After grinding, install it on the sample pressing plate, compact it and ensure the surface is smooth. For each experiment, the montmorillonite was treated in the same way as above with methanol aqueous solution without indicator, and it was used as a blank sample for spectral determination. The powder diffuse reflectance mode of the ultraviolet-visible light diffuse reflectance spectrometer is used to test the colored solid sample ( Figure 9 ). The standard curve equation y=0.873x-5.324( Figure 4 ), according to the acid...

Embodiment 3

[0072]The six acid-base indicator dyes in Example 1 were selected to form a pH variation range of 1.2 to 8.0. Rutile was selected as the test mineral. In order to ensure that all the mineral samples weighed can be colored, the volume-to-mass ratio (mL / g) of the solution to the mineral was optimized to 1.6, and a selected ratio of dye was added to the mineral to make it colored . Spread it evenly with a glass rod and dry it at 40°C for 1 hour. After grinding, install it on the sample pressing plate, compact it and ensure the surface is smooth. For each experiment, the mineral sample (rutile) was treated the same as above with methanol aqueous solution without indicator, and it was used as a blank sample for spectroscopic determination. The powder diffuse reflectance mode of the ultraviolet-visible light diffuse reflectance spectrometer is used to test the colored solid sample ( Figure 10 ). combined in Figure 10 The standard curve equation y=0.873x-5.324( Figure 4 ), ca...

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Abstract

The invention discloses a method for testing the pH value of the surface of a mineral sample by using a dye indicator agent and application. By adopting the method that the pH value of the surface ofa soil mineral is tested by using a dye indicator agent and a diffused transmission spectrum method, quantitative testing on acid-alkali properties of the surface of a soil solid is achieved, testingon the pH value of the surface of the soil mineral is successfully and accurately achieved, the technical problems that in the prior art the pH value of a soil mineral in an actual environment cannotbe accurately represented by the pH value of a suspension, and the like, can be solved, meanwhile the precision of the pH value of the solid surface is remarkably improved, and in addition the pH value can be represented relatively visibly. Except drying operation, other steps of the method are implemented in a common environment, and the method is low in testing condition requirement, simple to operate and low in cost. The method is good in applicability, can be widely applied to various soil minerals and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of soil analysis, in particular to a method and application for testing the surface pH of a mineral sample by using a dye indicator. Background technique [0002] Soil acidification is a serious and widespread global problem. Soil acidification in my country is becoming more and more serious, resulting in soil Ca 2+ , Mg 2+ 、K + Isobasic nutrient ions are leached in large quantities, H + The concentration and activity of toxic elements such as , aluminum and cadmium increased, which seriously affected the local agricultural production and ecological balance. Human factors such as acid deposition and unreasonable agricultural measures are the main causes of soil acidification, and different soils have different effects on acidification due to differences in mineral composition and physical and chemical properties. The acidity strength can be defined by pH. For the determination of soil pH, the traditiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 刘同旭程鹏飞王莹李芳柏
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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