Method for rapidly decomposing high silicon dioxide Cd polluted rice soil

A technology of silica and rice, applied in the field of analytical chemistry, can solve the problems of reducing pretreatment time, slow digestion of silica, and speeding up the digestion process, so as to reduce reaction time, save time and facilitate digestion

Inactive Publication Date: 2017-07-14
HUNAN AGRI BIOTECH RES CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for digesting high-silica Cd-contaminated paddy soil using high-content hydrofluoric acid, aiming at high-silica Cd-contaminated paddy soil, the digestion of silica is slow, and it takes a long time to soak silica The problem has been improved, reducing the pre-processing time and speeding up the digestion process

Method used

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  • Method for rapidly decomposing high silicon dioxide Cd polluted rice soil
  • Method for rapidly decomposing high silicon dioxide Cd polluted rice soil

Examples

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Effect test

Embodiment 1

[0027] Weigh 0.242 grams of soil sample, measure 1 milliliter of deionized water, 10 milliliters of 65% nitric acid, 10 milliliters of 20% hydrofluoric acid, and 2 milliliters of 72% perchloric acid, put them into a polytetrafluoroethylene tube, and place in a digestion furnace 15 minutes from room temperature to 110°C, 110°C for 20 minutes, 15 minutes to 150°C, 150°C for 30 minutes, 10 minutes to 180°C, 180°C until the liquid evaporates to dryness, then add 65% nitric acid to dissolve Digestion products continue to evaporate for 1-2 minutes while nitric acid dissolves. The total time for digestion is 2.5 hours.

Embodiment 2

[0032] Weigh 0.454 grams of soil sample, measure 1 milliliter of deionized water, 10 milliliters of 65% nitric acid, 10 milliliters of 20% hydrofluoric acid, and 2 milliliters of 72% perchloric acid, put them in a polytetrafluoroethylene tube, and place in a digestion furnace 15 minutes from room temperature to 110°C, 110°C for 20 minutes, 15 minutes to 150°C, 150°C for 30 minutes, 10 minutes to 180°C, 180°C until the liquid evaporates to dryness, then add 65% nitric acid to dissolve Digestion products continue to evaporate for 1-2 minutes while nitric acid dissolves. The total time for digestion is 4 hours.

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Abstract

The invention discloses a method for rapidly decomposing high silicon dioxide Cd polluted rice soil. The method comprises the following steps: (1) naturally airing a soil sample to a constant weight; (2) sieving a ground soil sample, and sampling the sieved soil sample; (3) adding a to-be-tested soil sample; (4) adding deionized water to wet the soil sample; (5) adding concentrated nitric acid, hydrofluoric acid and perchloric acid for decomposition, and mixing with deionized water, wherein 18%-22% hydrofluoric acid is 40%-45% of volume of a system; and (6) decomposing according to a decomposing procedure. By utilizing the method, the high silicon dioxide Cd polluted rice soil can be rapidly decomposed. Compared with a national standard, the decomposing time is saved by 1.5 hours, and meanwhile, the overnight soaking is omitted. According to the method, technical reference is provided for determining the content of a Cd element in the rapidly decomposed high silicon dioxide Cd polluted rice soil.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for quickly digesting high-silica Cd polluted paddy soil by using high-content hydrofluoric acid. Background technique [0002] Soil is an organic-inorganic complex, including many colloids, organic chelates, voids, etc., and these organic-inorganic complexes adsorb and fix many substances, metal ions, etc. The purpose of digestion is to release these substances, metal ions and other target substances that need to be determined from these organic-inorganic complexes, so as to accurately determine the target substances that need to be determined in the soil. [0003] Graphite furnace digestion has the characteristics of uniform heating, fast digestion, automatic control of temperature changes, and can realize the process of digestion without personnel on duty, making the entire digestion process semi-automatic. However, the key to the effect of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44
CPCG01N1/44
Inventor 柏连阳刘学端蒋慧丹刘宏伟梁伊丽徐梁枫
Owner HUNAN AGRI BIOTECH RES CENT
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