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Mensuration method for amorphous Fe in soil

A determination method and amorphous technology, which can be used in material analysis by observing the influence of chemical indicators and by chemical reaction of materials, etc., can solve problems such as poor selectivity, and achieve the effect of overcoming the high experimental results.

Inactive Publication Date: 2011-08-31
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some people have also used EDTA, tritiline and acetoacetate as extraction solutions to extract amorphous iron, but these methods have also been proved to be poor in selectivity, and some crystalline iron and even layered silicate iron will be dissolved during the extraction process.

Method used

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  • Mensuration method for amorphous Fe in soil
  • Mensuration method for amorphous Fe in soil
  • Mensuration method for amorphous Fe in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0037] Determination method: add hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, stir for 60 seconds, then place at room temperature for 2 hours and filter; pipette 20ml of the filtered extract and add 2.00mL of hydroxylamine hydrochloride solution, shake well, and place for 10 minutes to make Fe(III ) are all reduced to Fe(II), then add sodium acetate solution to adjust the pH of the extract to 4-5, add the color developer o-phenanthroline after the pH value is adjusted, mix and set the volume at room temperature for 60 minutes to make it fully Color development; finally, the content of amorphous iron and iron in the soil sample was measured on a 520nm wavelength spectrophotometer; hydrochloric acid solution and hydroxylamine hydrochloride solution were added to the soil sample, and the ratio was 1:40:40 in parts by weight. The soil sample is collected fresh soil, and plant residues can be seen in the soil sample, which is air-dried and ...

Embodiment 3

[0039] Determination method: add hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, stir for 40 seconds, place at room temperature for 1.5 hours and filter; pipette 15ml of filtered extract and add 1.50mL hydroxylamine hydrochloride solution, shake well, place for 8 minutes to make Fe(III ) are all reduced to Fe(II), then add sodium acetate solution to adjust the pH of the extract to 5-6, add the color developer o-phenanthroline after the pH value is adjusted, mix and set the volume at room temperature for 40 minutes to make it fully Color development; finally measure the content of amorphous iron and iron in the soil sample on a 520nm wavelength spectrophotometer; add hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, which is 1:50:50 in parts by weight. The soil sample is collected fresh soil, and plant residues can be seen in the soil sample, which is air-dried and passed through a 0.1mm sieve.

Embodiment 4

[0041] Determination method: add hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, stir for 50 seconds, place at room temperature for 2 hours and filter; pipette 5ml of the filtered extract and add 1.80mL of hydroxylamine hydrochloride solution, shake well, place for 6 minutes to make Fe(III ) are all reduced to Fe(II), then add sodium acetate solution to adjust the pH of the extract to 4-5, add the color developer o-phenanthroline after the pH value is adjusted, mix and set the volume at room temperature for 50 minutes to make it fully Color development; finally measure the content of amorphous iron and iron in the soil sample on a 520nm wavelength spectrophotometer; add hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, which is 1:30:30 in parts by weight. The soil sample is collected fresh soil, and plant residues can be seen in the soil sample, which is air-dried and passed through a 0.15mm sieve.

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Abstract

The invention relates to the mensuration method for amorphous Fe in soil, in particular to leach the soil with hydroxylamine for amorphous Fe and then mensurate it adopting the Visible spectrophotometry method. The specific steps are as follows: adding hydrochloric acid solution and hydroxylamine hydrochloride solution to the soil sample, churning for 30 - 60 seconds and placing at room temperature for 1-2 hours before filtration; Taking 5-20 ml filtered extract solution and adding 1.00-2.00 ml hydroxylamine hydrochloride solution and shaking up, and laying aside for 5-10 minutes to make the Fe(III) completely deacidized to Fe(II), and then adding sodium acetate solution to modify the PH value of the solution to 3-6, and adding a visualization reagent phenanthroline and shaking up the solution and laying aside at room temperature for 30-40 minutes for developing color, at last mensurating the contents of amorphous Fe in the soil sample on spectrophotometer with a wavelength of 520mn. The method of the invention is simple and easy to be promoted. The analysis method is fast and precise in realizing the mensuration of the amorphous Fe in soil.

Description

technical field [0001] The invention relates to a method for measuring amorphous iron in soil. Specifically, the amorphous iron in soil is leached by hydroxylamine, and then measured by visible spectrophotometry. Background technique [0002] Soil amorphous iron is the most active part of free iron oxide, has a large specific surface area, and plays a very important role in the physical and chemical properties of the soil, especially the specific adsorption of anions and cations and the stabilization of soil structure. It and free iron oxide (Fe d ) ratio (Fe o / Fe d ) or percentage is called the activation degree of iron oxide, [1-(Fe o / Fe d )] indicates the degree of aging, which can be used as an index to identify the B layer of podzol or the characteristics of soil formation. In addition, it can also reflect the impact of some soil-forming environments on soil. Therefore, this analysis is extremely useful for understanding the basic physical and chemical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 迟光宇陈欣史奕郑太辉赵牧秋
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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