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Method for determining available trace elements in soil

A trace element, effective state technology, used in the field of copper, zinc, manganese, rapid determination of available iron in neutral and calcareous soils, can solve the problems of inaccurate determination requirements, low sensitivity, deviation of results, etc. Significant economic and social benefits, simple sensitivity and high accuracy

Inactive Publication Date: 2016-08-10
TIANJIN INSTITUE OF QUALITY STANDARD & TESTING OF AGRICULTUAL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of soil samples need to use two methods at the same time, the operation is cumbersome and time-consuming, and some soils have low content of available trace elements. These two methods have low sensitivity and cannot meet the requirements of accurate determination, which will lead to The results are biased

Method used

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  • Method for determining available trace elements in soil
  • Method for determining available trace elements in soil
  • Method for determining available trace elements in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.1 Instruments and reagents

[0028] Agilent 7500a inductively coupled plasma mass spectrometer (Agilent, USA), with Babington high-salt nebulizer; quartz dual-channel spray chamber; quartz integrated rectangular tube; nickel sample cone. 240Z / 240FS atomic absorption spectrometer (Varian, USA). THZ-C constant temperature oscillator (Taicang Experimental Equipment Factory). T570H desktop ultrasonic cleaner (operating frequency 35kHz, power 600w, German Elma company). TD5A-WS desktop centrifuge (Changsha Xiangyi Centrifuge Instrument Co., Ltd.), ultrapure water machine (Milli-Q) from Millipore, USA.

[0029] Mixed standard stock solution: 1000mg·L -1 iron, manganese, copper, zinc.

[0030] Mixed standard solution: dilute iron, manganese, copper and zinc standard stock solutions step by step with DTPA extractant to 5, 10, 20, 50, 100, 200 μg·L -1 Mix the standard solution and set aside.

[0031] Internal standard solution: 100mg·L -1 Rh, diluted with 2% nitric acid...

Embodiment 2

[0053] Comparative experiment of ultrasonic-assisted extraction-inductively coupled plasma mass spectrometry and national standard method for determining the content of available iron, manganese, copper and zinc in soil:

[0054] Weigh 10.00g of the soil sample passed through a 2mm aperture sieve, place it in a 150mL conical flask with a stopper, add 20mL of DTPA extraction agent, cover the bottle tightly, and extract it by two methods: (1) According to the national standard method (NY / T 890-2004) method requirements, shake at (25±2)℃, (180±20)r / min for 2h, (2) Ultrasonic extraction: put the Erlenmeyer flask into the ultrasonic cleaner, ultrasonic at room temperature 20min. The samples of the above two extraction treatments were taken out, centrifuged at 3000r / min for 5 minutes, and the supernatant was collected. The contents of effective iron, manganese, copper and zinc in the supernatant were determined by atomic absorption spectrometry (AAS) and inductively coupled plasma...

Embodiment 3

[0059] Weigh 10 grams of air-dried, crushed and 2mm sieved soil samples into a 150mL Erlenmeyer flask, then add 20mL of DTPA extraction agent, and ultrasonically extract at room temperature for 20 minutes. After the extraction was completed, after content in the Erlenmeyer flask was dry-filtered or centrifuged, the content of effective iron, manganese, copper and zinc in the supernatant was measured by inductively coupled plasma mass spectrometry (ICP-MS) to be 104mg / kg, 27mg / kg, 1.3mg / kg, 2.8mg / kg.

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Abstract

The invention discloses a method for determining available trace elements in soil. The method comprises the following steps: (1) picking out the animal and plant residues, stone and the like after air drying the soil sample, pouring the sample into a clean wooden tray, and porphyrizing the sample by a stick to make the sample all pass the 2mm nylon mesh; (2) weighing a certain amount of soil sample to place in a conical flask with cover, adding a certain amount of extracting agent, stirring the mixture, and performing graded ultrasonic extraction for 5-30 min; and (3) filtering or centrifugating the content in the conical flask, taking the supernatant to determine the content of available iron, manganese, copper, and zinc by using inductively coupled plasma mass spectrometry. The method is based on the supersonic wave having rapid and high-efficiency extraction technology, combines the characteristics of the inductively coupled plasma mass spectrometry such as high sensitivity, wide linearity range, and multielement simultaneous determination, and has very important meaning of researching available trace elements in agricultural soil. The invention invents the method for analyzing available trace elements in soil efficiently and rapidly.

Description

technical field [0001] The present invention relates to a method for measuring available state trace elements in neutral and calcareous soils, in particular to a rapid determination of available state iron, manganese, Copper and zinc methods. Background technique [0002] Trace elements iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn) are necessary for plant growth. They are closely related to biomolecular proteins, polysaccharides, nucleic acids, vitamins, etc., and have various physiological effects on plants. Key steps in the metabolic process play a regulatory role. However, in recent years, in order to pursue high yields of crops, a large amount of N, P, and K fertilizers, especially high-concentration chemical fertilizers, have resulted in a decrease in the input of trace elements such as iron, manganese, copper, and zinc, and the continuous increase in the yield per unit area of ​​crops. The increased amount of nutrient removal results in a decrease in the cont...

Claims

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Application Information

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IPC IPC(8): G01N27/64G01N1/28
CPCG01N27/64G01N1/28
Inventor 陈秋生杨喆张强刘烨燑殷萍艾丹
Owner TIANJIN INSTITUE OF QUALITY STANDARD & TESTING OF AGRICULTUAL PRODS
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