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Improved determination method of available silicon in soil

A soil and soil sample technology, applied in the field of soil detection, can solve the problems of low measurement sensitivity and insignificant reaction color, and achieve the effect of providing detection sensitivity and accuracy

Inactive Publication Date: 2017-05-31
江苏中宜金大分析检测有限公司 +1
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Problems solved by technology

[0004] The technical problem solved by the present invention is that in the prior art, sulfuric acid is used to adjust the pH of the solution before the reaction for the assay method of soil available silicon, and 15g / L ascorbic acid is used to reduce silicomolybdic acid to silicon molybdenum blue, colorimetric at a wavelength of 700nm, by The concentration of silicon is determined by measuring the shade of blue, but in actual experiments, it is found that the reaction color of this method is not obvious, and the measurement sensitivity is not high

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Embodiment Construction

[0014] An improved method for measuring available silicon in soil, comprising the following steps:

[0015] 1) Preparation of test solution: Weigh about 10g of air-dried soil sample that passed through a 2mm sieve into a 250ml polyethylene bottle, add 100ml of 0.025mol / L citric acid solution, cover the bottle cap, shake well, and place in a 30°C incubator Incubate for 5 hours, shake once every 1 hour, take it out and dry filter, and do a blank experiment at the same time;

[0016] 2) Draw a standard curve: Accurately draw 0.00ml, 0.50ml, 1.00ml, 1.50ml, 2.00ml, and 2.50ml of standard solutions containing 25mg / L of silicon into 50ml plastic colorimetric tubes, and add 3.5ml of 1mol / L Hydrochloric acid solution, dilute to 25ml with distilled water, shake well, add 2.5ml of 50g / L ammonium molybdate, shake well, let it stand for 15-20 minutes, add 5ml 50g / L oxalic acid, 5ml 2g / L ascorbic acid, shake well, use after cooling Dilute with distilled water to the 50mL mark, shake well,...

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Abstract

The invention discloses an improved determination method of available silicon in soil, and belongs to the field of environmental protection. In the method, based on the silicon-molybdenum blue spectrophotometry, silicon and ammonium molybdate generate a silicon-molybdenum yellow complex under a certain acidity, then the acidity is increased, the silicon-molybdenum yellow complex is reduced to silicon-molybdenum blue with ascorbic acid, and colorimetry is carried out. The detection limit of the method on available silicon in soil is 1.2 mg / kg, and the relative standard deviation is smaller than 3.0%. According to the method, hydrochloric acid is used for replacing sulfuric acid to regulate pH, 2 g / L ascorbic acid is used for replacing 15 g / L ascorbic acid to reduce silicomolybdic acid, the colorimetric wavelength is adjusted to be 680 nm from original 700 nm, and the detection sensitivity and accuracy are improved more greatly.

Description

technical field [0001] The invention relates to the technical field of environmental soil detection, in particular to an improved method for measuring effective silicon in soil. Background technique [0002] In nature, silicon is widely distributed, second only to oxygen, mainly in the form of silicon dioxide and silicate, and is one of the important nutrients needed for crop growth. , the fourth growth element after potassium. Therefore, it is very necessary to study silicon in soil. [0003] The Ministry of Agriculture promulgated the determination method of soil available silicon in 2006 "Soil Testing Part 15: Determination of Soil Available Silicon" (NY / T 1121.15-2006), this method uses sulfuric acid to adjust the pH of the solution before the reaction, and uses 15g / L ascorbic acid Reduction of silicomomolybdic acid to silicon molybdenum blue, colorimetry at a wavelength of 700nm, and determination of silicon concentration by measuring the depth of blue, but in actual ...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
CPCG01N1/28G01N21/31G01N21/314
Inventor 任洪强许柯
Owner 江苏中宜金大分析检测有限公司
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