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Method for rapidly determining contents of lithium, niobium, tin and bismuth in soil

A rapid determination of soil and soil technology, applied in the field of niobium and bismuth content, rapid determination of lithium and tin in soil, can solve the problems of soil pollution, contaminated agricultural products, food safety issues, etc., to achieve high digestion cost, high recovery rate and sensitivity, The effect of high accuracy

Pending Publication Date: 2020-11-06
南京海关动植物与食品检测中心 +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, my country's population, industrialization level and people's quality of life have been rapidly improved, but this has also led to the emergence of a large number of industrial and agricultural pollutants, such as: metal mining tailings accumulation, industrial waste, sewage discharge, sewage agricultural irrigation resulting in varying degrees of soil pollution
Soil pollution, which in turn may contaminate some agricultural products, causing food safety issues

Method used

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  • Method for rapidly determining contents of lithium, niobium, tin and bismuth in soil
  • Method for rapidly determining contents of lithium, niobium, tin and bismuth in soil
  • Method for rapidly determining contents of lithium, niobium, tin and bismuth in soil

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Experimental program
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Effect test

Embodiment 1

[0030] The pretreatment of embodiment 1 soil sample

[0031] Sample collection and storage Collect and store soil samples in accordance with the relevant regulations of HJ / T 166. Contamination and loss of analyte elements should be avoided during sample collection, transportation and storage.

[0032] Determination of dry matter content The determination of dry matter content of soil samples is carried out in accordance with HJ 613.

[0033] Preparation of samples Remove sticks, leaves, stones and other foreign matter in the sample, and according to the requirements of HJ / T 166, air-dry, coarsely grind and finely grind the collected samples until they pass through a 0.15mm (100 mesh) sieve.

[0034] Preparation of soil samples Accurately weigh 0.1g (accurate to 0.0001g) of the sample to be tested in a polytetrafluoroethylene digestion tube, add 6mL of nitric acid, 4mL of hydrofluoric acid and 1mL of perchloric acid, and place in an electric digestion furnace at 120°C , diges...

Embodiment 2

[0037] Embodiment 2 Inductively coupled mass spectrometer is measured

[0038] 1. Instrument tuning

[0039] After igniting the plasma, the instrument was preheated and stabilized for 30 min. Use the mass spectrometer tuning solution to tune the sensitivity, oxides and double charges of the instrument. Under the condition that the sensitivity, oxides and double charges of the instrument meet the requirements, the relative standard of the signal intensity of the elements contained in the tuning solution given by the mass spectrometer The deviation should be ≤5%. Perform mass calibration and resolution verification within the mass range covering the analyte, if the difference between the mass calibration result and the true value exceeds ±0.1 amu or the resolution of the tuned element signal corresponds to a peak width of more than 0.6 at 10% of the peak height In the range of amu~0.8amu, the mass spectrometer should be calibrated according to the instructions of the instrumen...

Embodiment 3

[0065] Embodiment 3 detection limit and limit of quantitation (lower limit of determination)

[0066] When the sample volume is 0.10g and the constant volume after digestion is 50mL, the detection limits and lower determination limits of the four metal elements are shown in Table 4.

[0067] Table 4 method detection limit and lower limit of determination (mg / kg)

[0068] element lithium niobium tin bismuth Method detection limit 0.4 0.2 0.2 0.04 Lower limit of determination 1.6 0.8 0.8 0.16

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Abstract

The invention relates to the field of detection, particularly to the field of soil detection, more particularly to a method for rapidly determining the contents of lithium, niobium, tin and bismuth insoil. The method is a graphite furnace digestion and inductively coupled plasma mass spectrometer combined method, wherein the graphite furnace digestion refers to that a nitric acid-perchloric acid-hydrofluoric acid mixed solution is used as a digestion solution and digestion is performed by an electric heating plate. According to the method, a graphite furnace digestion mode is adopted, so thatthe problems that the requirement on the weighing accuracy of the sample amount is high in microwave digestion, the digestion cost is high, and perchloric acid cannot be added into a digestion systemin order to avoid the use safety problem of an instrument can be effectively avoided; by improving the treatment method of the soil sample, the test method capable of being used in cooperation with the inductively coupled plasma mass spectrometer is obtained, so that the inductively coupled plasma mass spectrometer is introduced into measurement of the content of lithium, niobium, tin and bismuthin soil; and the method has the advantages of simplicity, convenience, quickness, good instrument stability and high accuracy.

Description

technical field [0001] The invention relates to the field of detection, in particular to the field of soil detection, and more specifically to a method for quickly measuring the contents of lithium, niobium, tin and bismuth in soil. Background technique [0002] In recent years, my country's population, industrialization level and people's quality of life have been rapidly improved, but this has also led to the emergence of a large number of industrial and agricultural pollutants, such as: metal mining tailings accumulation, industrial waste, sewage discharge, sewage agricultural irrigation And so on, resulting in different degrees of soil pollution. Soil pollution may contaminate some agricultural products, causing food safety problems. Therefore, accurate determination of lithium, niobium, tin, and bismuth in soil is extremely important for improving the ability to monitor soil quality and effectively monitoring soil pollution. [0003] When using an inductively coupled p...

Claims

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Application Information

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IPC IPC(8): G01N1/44G01N27/62
CPCG01N1/44G01N27/62
Inventor 王雪婷刘芸王艳王宇韩燃石峰王茂华唐茂芝丁涛
Owner 南京海关动植物与食品检测中心
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