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Selective extraction method for element supply state in ecological environment and soil quality evaluation

A technology for ecological environment and quality evaluation, applied in the preparation of test samples, thermal stimulation analysis, material stimulation analysis, etc., can solve problems such as unscientific, unreasonable evaluation of ecological environment and soil quality, and achieve the effect of improving rationality

Pending Publication Date: 2021-06-15
NANJING CENT CHINA GEOLOGICAL SURVEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to improve the unreasonable and unscientific status quo of the evaluation of the ecological environment and soil quality caused by the above-mentioned defects of the analysis method, the present invention provides a selective extraction and analysis method for the available state of elements in the evaluation of the ecological environment and soil quality According to different acidic extraction reagents, they are divided into: dilute hydrochloric acid selective extraction method, dilute nitric acid selective extraction method and dilute aqua regia selective extraction method

Method used

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  • Selective extraction method for element supply state in ecological environment and soil quality evaluation
  • Selective extraction method for element supply state in ecological environment and soil quality evaluation
  • Selective extraction method for element supply state in ecological environment and soil quality evaluation

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The method for selectively extracting the available state of elements in the evaluation of ecological environment and soil quality includes the following steps:

[0038] 1) Weigh a certain amount of loose sediment or soil samples of five national soil morphology analysis standard samples, GBW07437, GBW07438, GBW07441, GBW07443, GBW07445, and dry them at 105°C to constant weight, and the particle diameter is not more than 150 mesh ;

[0039] 2) Then add hydrochloric acid with a mass percentage concentration of 10% to a certain amount of sample weighed. The amount of hydrochloric acid added is based on the ratio of solid to liquid ratio of 1:600g / mL. ±10 minutes;

[0040] 3) The mixture extracted by stirring or shaking is subjected to solid-liquid separation, and the separated clear liquid is diluted to a suitable concentration (according to the difference of ICP-AES, ICP-MS analysis instruments or the content of elements in the extract) for instrumental analysis Determ...

Embodiment 2

[0042] The method for selectively extracting the available state of elements in the evaluation of ecological environment and soil quality includes the following steps:

[0043] 1) Weigh a certain amount of five national soil morphology analysis standard samples, namely GBW07437, GBW07438, GBW07441, GBW07443, GBW07445 loose sediment samples, and dry them at 105°C to constant weight, and the particle diameter is not more than 150 mesh;

[0044] 2) Then add nitric acid with a mass percentage concentration of 10% to a certain amount of sample weighed, the amount of nitric acid is added according to the ratio of solid to liquid ratio of 1:300g / mL, and stirred at 60±5℃ under normal pressure for 180± 10 minutes;

[0045] 3) The mixture extracted by stirring or shaking is subjected to solid-liquid separation, and the separated clear liquid is diluted to a suitable concentration (according to the difference of ICP-AES, ICP-MS analysis instruments or the content of elements in the extra...

Embodiment 3

[0047] The method for selectively extracting the available state of elements in the evaluation of ecological environment and soil quality includes the following steps:

[0048] 1) Weigh a certain amount of five national soil morphology analysis standard samples, namely GBW07437, GBW07438, GBW07441, GBW07443, GBW07445 loose sediment samples, and dry them at 105°C to constant weight, and the particle diameter is not more than 150 mesh;

[0049] 2) Then add aqua regia with a mass percentage concentration of 10% to a certain amount of sample weighed, the amount of aqua regia is added according to the ratio of solid to liquid ratio of 1:100g / mL, ultrasonic at 60±5℃ Oscillate for 180±10 minutes;

[0050] 3) The mixture extracted by stirring or shaking is subjected to solid-liquid separation, and the separated supernatant is diluted to an appropriate concentration (according to the difference of ICP-AES, ICP-MS analysis instruments or the content of elements in the extract) for instr...

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Abstract

The invention relates to the field of ecological environment and land quality evaluation and discloses a selective extraction method of an element supply state in ecological environment and soil quality evaluation, which comprises the following steps of 1) collecting a representative soil or sediment sample, removing biological crumbs, drying, and crushing until the particle size is not greater than 150 meshes; (2) adding an acidic extracting agent into the crushed sample for extraction, wherein the extraction temperature is 60+ / -5 DEG C; wherein the acidic extracting agent is hydrochloric acid or nitric acid or aqua regia or antiaqua regia, and the mass percent concentration of the hydrochloric acid or nitric acid or aqua regia or antiaqua regia is 10%; and (3) carrying out solid-liquid separation on the extracted mixture, diluting the separated liquid, and analyzing and measuring the element supply state in the ecological environment and soil quality evaluation by using an instrument. The method is advantaged in that the maximum supplying amount of beneficial or harmful elements which can be passively absorbed by plants in soil or sediments can be extracted at a time; the interference of the residual element state, which exists in minerals such as silicate, accounts for most of the beneficial or harmful elements and cannot be passively absorbed by plants, on the soil quality or ecological environment evaluation is eliminated.

Description

technical field [0001] The invention belongs to the field of land quality evaluation or ecological environment evaluation of soil or sediment, and specifically relates to a selective extraction method of supplyable state of elements in ecological environment and soil quality evaluation. The purpose is to extract only the available state of elements that may be passively absorbed by plants in soil or sediment, and remove the residual state of elements that are basically not passively absorbed by plants in silicate and other minerals, and eliminate the residual state of elements that are harmful to the ecology. Environmental or soil quality evaluation interference, so that the element background value evaluation and pollution or loss evaluation of the ecological environment and land quality can be carried out more scientifically and reasonably. Background technique [0002] The content of toxic and harmful elements or beneficial elements and rare rare earth elements in soil or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/28G01N1/38
CPCG01N21/73G01N1/28G01N1/38
Inventor 王爱华李华玲袁静张飞黄海波刘建坤
Owner NANJING CENT CHINA GEOLOGICAL SURVEY