Method for measuring available phosphorus in planting soil
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A determination method and technology for available phosphorus are applied in the field of determination of substance content to achieve the effects of good selectivity, low cost and lower detection limit
Inactive Publication Date: 2014-01-08
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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Problems solved by technology
However, there are many kinds of soil sample extraction agents currently in use, but they have not yet been standardized.
Method used
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Embodiment 1
[0017] The assay method of available phosphorus in planting soil comprises the following steps:
[0018] (1) Pipette 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 mL of phosphorus standard solution of 5 μg / mL into a 25 mL colorimetric tube, dilute with water to 10 mL, add 2 drops of dinitrophenol indicator, With c(NH 4 OH) = 0.5 mol / L of NH 4 OH and c(HCl)=0.5mol / L HCl to light yellow, add 1.5 mL of molybdenum antimony anti-chromogenic agent, dilute to the mark with water, shake well, measure the absorbance value at a wavelength of 700nm, take phosphorus content as horizontal Coordinates, the absorbance value is the vertical coordinate to draw the working curve;
[0019] (2) Weigh 0.5000-1.0000g of the dried soil sample that passed through a 20-mesh sieve, put it into a 150m dry Erlenmeyer flask, add 40mL c(NH 4 F) = 0.015 mol / L of NH 4 F and c(HCl)=0.3mol / L HCl extractant, that is, 0.015 mol / L NH 4 F- 0.3mol / L HCl solution, shake well, shake for about 5min, and place at room te...
Embodiment 2
[0023] The assay method of available phosphorus in planting soil, and the difference of embodiment 1 is:
[0024] In step (2), the soil sample is a soil sample 10-15 cm below the ground surface. This location is usually the area where the plant root system is located, which can better measure the soil condition of the plant growth layer, better average soil and planting conditions.
[0025] In step (2), pass the soil sample through a 40-mesh sieve, and weigh 0.5000-1.0000 g. The 40-mesh sieve helps to refine the soil sample particles, fully react with the extraction agent, and improve the accuracy of available phosphorus determination.
[0026] After the soil sample is sieved, it is gently dried at 60°C. On the one hand, the water is dispersed to improve the measurement accuracy, and on the other hand, the gentle drying helps to maintain the original properties of the soil.
[0027] In step (2), the extractant is 0.015 mol / L NH 4 F- The amount of 0.3mol / L HCl solution is 45...
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Abstract
The invention relates to a method for measuring available phosphorus in planting soil. The method is characterized by comprising the steps of (1) drawing a working curve; (2) weighing a soil sample of 0.5000g-1.0000g, putting the soil sample into a 150ml conical flask, adding NH4F and HCl extracting agents into the conical flask, shaking up the mixture, standing still for 1.5h at room temperature, carrying out dry filtration by non-phosphorus filter paper, and using a 100mL dry beaker to contain filtrate to be measured, wherein 40-45mL c(NH4F) is equal to 0.015mol/L, and c(HCl) is equal to 0.3mol/L; (3) moving 10.0mL of filtrate to be measured into a 25mL colorimetric tube, adding 2-5 drops of dinitrophenol indicator, HCl and NH3.H2O to adjust the test solution to be slight yellow, then adding 1.5mL-2mL of an antimony-molybdenum anti-mixing color developing agent into the test solution, diluting the test solution to the scale by distilled water, shaking up, developing in water bath at the temperature of 40-45 DEG C for 20min-30min, or standing still at the room temperature of 25 DEG C for 40min, cooling, measuring the light absorption value at a part with the wave length of 700nm on a spectrophotometer, and calculating the content of the available phosphorus in the sample by a regression equation of a working curve, wherein c(HCl) is equal to 0.5mol/L, and c(NH3.H2O) is equal to 0.5mol/L. The method is high in analysis speed, good in selectivity, high in sensitivity, low in analysis cost and suitable for popularization.
Description
technical field [0001] The present invention relates to the determination of substance content, especially relates to the determination method of phosphorus. Background technique [0002] Available phosphorus represents the phosphorus in the soil that is easily absorbed by plants. The source is that plant roots and soil microorganisms exhale carbon dioxide, which dissolves in soil moisture and becomes carbonic acid, and a part of carbonic acid is electrolyzed into bicarbonate ions and hydrogen ions. Bicarbonate ions are exchanged with phosphate ions in the soil, and the exchanged phosphate ions are dissolved in the soil solution and can be directly absorbed by flora. [0003] The accurate determination of available phosphorus content in soil is helpful to improve soil fertility and crop allocation, and it is also of great significance to environmental monitoring and environmental protection. Especially for the determination of available phosphorus in planting soil, it is h...
Claims
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Application Information
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