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Method for evaluating soil acid-buffer ability by utilizing surface hydroxyl hydrogen ion adsorption capacity

A technology of adsorption capacity and hydrogen ions, applied in the field of soil chemistry, to achieve the effect of stable results

Inactive Publication Date: 2019-07-26
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The primary purpose of the present invention is to overcome the shortcoming and deficiency of existing acid buffer capacity evaluation method, provide a kind of method that utilizes surface complexation model to obtain the hydrogen ion adsorption capacity of surface hydroxyl to evaluate soil acid buffer performance; Utilize hydrogen ion adsorption capacity to Quantify the content of acid buffering substances in soil, and realize the evaluation of soil acid buffering performance from the perspective of buffering mechanism

Method used

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  • Method for evaluating soil acid-buffer ability by utilizing surface hydroxyl hydrogen ion adsorption capacity
  • Method for evaluating soil acid-buffer ability by utilizing surface hydroxyl hydrogen ion adsorption capacity
  • Method for evaluating soil acid-buffer ability by utilizing surface hydroxyl hydrogen ion adsorption capacity

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Embodiment 1

[0052] Embodiment 1 method construction

[0053] (1) Soil acid-base buffer reaction system

[0054] The acid-base buffering reaction of soil is mainly carried out by many active substances, mainly composed of calcium carbonate, oxygen-containing functional groups, exchangeable cations, and oxides of iron and aluminum. The following is a brief analysis of the main components involved in the buffer reaction system.

[0055] Calcium carbonate can dissolve under acidic conditions and produce carbon dioxide volatilization. As shown in formula (1).

[0056]

[0057] Surface functional groups can accept hydrogen ions under acidic conditions and donate hydrogen ions under basic conditions. As shown in formula (2).

[0058]

[0059] Exchangeable cations mainly include base ions and acid-causing ions (hydrogen ions, aluminum ions), and exchangeable base ions can exchange with acid-causing ions under acidic conditions. Under alkaline conditions, acid-causing ions can exchange ...

Embodiment 2

[0073] (1) Selection and pretreatment of soil

[0074] The calcium carbonate content of the collected Hainan brick red soil (S1) is less than 1%. After natural air drying, it is ground through a 0.15mm nylon sieve.

[0075] (2) Preparation and calibration of strong acid and strong base standard solutions

[0076] 0.1M hydrochloric acid: Take 8.3mL of concentrated hydrochloric acid (12M), dilute to 1L with ultrapure water (18MΩ·cm), and accurately weigh 0.02g of sodium carbonate for calibration.

[0077] 0.1M sodium hydroxide: Weigh 4g of sodium hydroxide, dissolve it with ultrapure water and dilute to 1L, accurately weigh 0.05g of potassium hydrogen phthalate for calibration.

[0078] (3) Preparation of ionic strength solution

[0079] Weigh 5.844g of sodium chloride, dissolve it in ultrapure water and dilute to 1L to make a 0.1M sodium chloride solution.

[0080] (4) Acid-base titration process

[0081] In this method, a Metrohm 905 automatic potentiometric titrator (Metr...

Embodiment 3

[0101] (1) Selection and pretreatment of soil

[0102] The collected Guangdong paddy soil (S2) has a calcium carbonate content of less than 1%, and is ground through a 0.15mm nylon sieve after natural air drying.

[0103] (2) Preparation and calibration of strong acid and strong base standard solutions.

[0104] 0.1M nitric acid: take 6.97mL of concentrated nitric acid (14M), dilute to 1L with ultrapure water (18MΩ·cm), and accurately weigh 0.02g of sodium carbonate for calibration.

[0105] 0.1M Potassium Hydroxide: Weigh 5.61g of Potassium Hydroxide, dissolve it in ultrapure water and dilute to 1L, accurately weigh 0.05g of Potassium Hydrogen Phthalate for calibration.

[0106] (3) Weigh 10.11 g of potassium nitrate, dissolve it in ultrapure water and dilute to 1 L to prepare a 0.1 M potassium nitrate solution.

[0107] (4) Acid-base titration process

[0108] Using the Metrohm 905 automatic potentiometric titrator, the pH electrode was calibrated in standard buffer solut...

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Abstract

The invention provides a method for evaluating a soil acid-buffer ability by utilizing a surface hydroxyl hydrogen ion adsorption capacity. A specific substance having an acid-base buffer reaction onthe soil is simplified into the surface hydroxyl (as a formula) and is formed on the surface of the soil; a specific buffer reaction of soil to acid and alkali is simplified to be a protonation reaction and a deprotonation reaction of the surface hydroxyl; a surface complexation model quantifies the capacity of the adsorbed hydrogen ions in the surface hydroxyl protonation process, and the abilityof the soil for buffering acids is evaluated innovatively from a molecular perspective, thus the surface complexing model is applied to the evaluation of a soil acid-base buffer ability. According tothe evaluation method of the invention, an obtained result is stable and reliable, and the evaluation method has good application prospects in the field of soil chemical analysis.

Description

technical field [0001] The invention belongs to the technical field of soil chemistry, and relates to a method for evaluating the acid buffering performance of soil by using the surface hydroxyl hydrogen ion adsorption capacity, in particular to evaluating the acid buffering performance of soil by using the surface complexation model to obtain the hydrogen ion adsorption capacity of the surface hydroxyl. Background technique [0002] Soil acidification is a natural process, but human activities have significantly accelerated the rate of soil acidification. Since soil has a certain ability to buffer pH changes, it is very critical to accurately evaluate the buffering performance of soil buffer against acid for predicting soil acidification and strengthening soil management. The general method for obtaining the buffer acid capacity of soil is the titration method, which is determined by titrating the soil solution with acid and obtaining the amount of acid required to change o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/166
Inventor 刘同旭杨阳王莹李芳柏
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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