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A method for measuring available phosphorus in alkaline soil by resin adsorption assisted icp-aes method

A technology of ICP-AES and resin adsorption, applied in the direction of material excitation analysis, thermal excitation analysis, etc., can solve the problems of cumbersome operation, instrument damage, time-consuming, etc.

Active Publication Date: 2021-06-08
陕西省地质矿产实验研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At this stage, the commonly used method for the determination of available phosphorus in alkaline soil (pH>7.00) is to use 0.5mol / L sodium bicarbonate solution (pH=8.5) to extract and then use the molybdenum antimony anti-colorimetric method for determination. It is cumbersome, time-consuming, with a large amount of reagents and many influencing factors, and it will also cause harm to the environment
With the development of science and technology, many people began to try to use advanced instruments to measure available phosphorus in alkaline soil. When using ICP-MS method and ICP-AES method to directly measure available phosphorus in alkaline soil, it is impossible to use the extractant The sodium ions in the solution are separated from the extraction solution, so the extraction agent will affect the sensitivity of the instrument and the polyatomic ions formed by the sodium ions will interfere with the determination of phosphorus, and at the same time, it is easy to cause sodium salts to accumulate on the rectangular tube, causing damage to the rectangular tube , leading to serious damage to the instrument, which is not conducive to mass analysis

Method used

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  • A method for measuring available phosphorus in alkaline soil by resin adsorption assisted icp-aes method
  • A method for measuring available phosphorus in alkaline soil by resin adsorption assisted icp-aes method
  • A method for measuring available phosphorus in alkaline soil by resin adsorption assisted icp-aes method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment includes the following steps:

[0023] Step 1. Accurately weigh 5g (accurate to 0.001g) of alkaline soil sample and place it in a plastic bottle, then accurately add 100mL of sodium bicarbonate solution, tightly cover the bottle stopper, place it on a shaker for 30 minutes, and then centrifuge immediately and use Filtrate with phosphorus filter paper, after discarding the initial 7.5mL filtrate, the remaining filtrate is collected in the Erlenmeyer flask to obtain filtrate one; the molar concentration of the sodium bicarbonate solution is 0.5mol / L; the oscillation frequency of the oscillator is 165 times / min;

[0024] The function of discarding the initial 7.5mL filtrate is to remove the impurities on the phosphorus-free filter paper to avoid affecting the accuracy of the measurement results;

[0025] Step 2: Put 50 mL of the filtrate obtained in Step 1 into a beaker, add magnetron and 70 g of D201 resin, place it in a magnetic stirrer for 50 minutes at...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031]Step 1. Accurately weigh 5g (accurate to 0.001g) of alkaline soil sample and place it in a plastic bottle, then accurately add 100mL of sodium bicarbonate solution, tightly cover the bottle stopper, place it on a shaker for 30 minutes, and then centrifuge immediately and use Filtrate with phosphorus filter paper, after discarding the initial 7mL filtrate, collect the remaining filtrate in the conical flask to obtain filtrate one; the molar concentration of the sodium bicarbonate solution is 0.5mol / L; the oscillation frequency of the oscillator is 150 times / min;

[0032] Step 2. Put 50mL of the filtrate obtained in Step 1 into a beaker, add magnetron and 85g D201 resin, place it in a magnetic stirrer for 40min at a temperature of 25°C, and then filter to obtain effective phosphorus adsorbed D201 resin, use the eluent to elute the available phosphorus adsorbed in the D201 resin, after the available phosphorus is compl...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] Step 1. Accurately weigh 5g (accurate to 0.001g) of alkaline soil sample and place it in a plastic bottle, then accurately add 100mL of sodium bicarbonate solution, tightly cover the bottle stopper, place it on a shaker for 30 minutes, and then centrifuge immediately and use Phosphorus filter paper is filtered, after discarding the initial 8mL filtrate, the remaining filtrate is collected in the Erlenmeyer flask to obtain filtrate one; the molar concentration of the sodium bicarbonate solution is 0.5mol / L; the oscillation frequency of the oscillator is 180 times / min;

[0038] Step 2. Put 50 mL of the filtrate obtained in Step 1 into a beaker, add magnetron and 100 g of D201 resin, place it in a magnetic stirrer for 60 minutes at a temperature of 20 ° C, and then filter to obtain the available phosphorus adsorbed D201 resin, use the eluent to elute the available phosphorus adsorbed in the D201 resin, after the avail...

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Abstract

The invention discloses a method for measuring available phosphorus in alkaline soil by resin adsorption-assisted ICP-AES method. The method comprises the following steps: 1. Weigh an alkaline soil sample and place it in a plastic bottle, then add sodium bicarbonate solution to oscillate, Filtrate after centrifugation to obtain filtrate 1; 2. Put filtrate 1 in a beaker, add magnets and D201 resin to stir and exchange, then filter to obtain D201 resin with available phosphorus adsorbed, and then use eluent to elute D201 resin After the available phosphorus adsorbed in the medium is completely eluted, the filtrate 2 is obtained by filtration; 3, the filtrate 2 is measured by an inductively coupled plasma spectrometer to measure the content of available phosphorus in the alkaline soil sample. The present invention adopts D201 resin exchange adsorption and re-desorption of available phosphorus in alkaline soil, and then uses ICP-AES method to measure the phosphorus in the eluted solution to obtain the content of available phosphorus in alkaline soil. The test method improves the accuracy of the measurement results Accuracy and precision, reducing the damage of the matrix to the instrument.

Description

technical field [0001] The invention belongs to the technical field of measuring available phosphorus content in alkaline soil, and in particular relates to a resin adsorption-assisted ICP-AES method for measuring available phosphorus in alkaline soil. Background technique [0002] Phosphorus is an important life element in the biosphere and one of the nutrient elements necessary for plant growth. Soil available phosphorus, also known as available phosphorus, is the phosphorus component in the soil that can be absorbed by plants, including all water-soluble phosphorus and some adsorbed phosphorus. And organic phosphorus, and some soils also include some precipitated phosphorus. In chemistry, available phosphorus is defined as the 32 P Phosphorus and phosphate in soil solution that undergo isotope exchange or are easily extracted by certain chemical reagents. The phosphorus extracted by chemical method (0.5mol / L sodium bicarbonate solution extraction) mainly refers to phosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 韩张雄熊英马娅妮万的军王曦婕董亚妮
Owner 陕西省地质矿产实验研究所有限公司