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Method for detecting aluminum in jellyfishes through nitrous oxide-acetylene flame atomic absorption method

A flame atomic absorption and nitrous oxide technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of detection standards, errors, high dosage, etc., and achieve the effect of wide detection range, good linearity and high detection sensitivity

Inactive Publication Date: 2014-09-03
SOUTH CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are certain shortcomings in the determination methods of aluminum in jellyfish products. Which detection method is the most appropriate and fair, and there are problems in the detection standards. It will become empty talk to measure the safety of products. Therefore, the establishment of a determination method for aluminum in jellyfish products especially necessary
[0004] Aluminum in jellyfish is added as a processing aid, and the dosage is relatively high, causing the residual aluminum to reach 500-1000mg / kg. At present, most of the detection methods for aluminum are for trace aluminum elements (μg / kg). The detection method of trace aluminum is used for the detection of high content of aluminum, which requires multiple dilution of the sample, which will lead to a large error, thus making the detection result inaccurate. Currently, there is no specific method for the high content of jellyfish (mg / kg) suitable detection method for aluminum

Method used

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  • Method for detecting aluminum in jellyfishes through nitrous oxide-acetylene flame atomic absorption method
  • Method for detecting aluminum in jellyfishes through nitrous oxide-acetylene flame atomic absorption method

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Embodiment 1

[0030] (1) Wavelength scanning: By referring to the wavelength table, scan the emission spectrum of the aluminum element lamp at 300~400nm to obtain four optional absorption wavelengths, which are 394.4, 396.1, 309.3 and 308.2nm, figure 1 It is the scanning picture of the emission spectrum of aluminum element by atomic absorption instrument;

[0031] (2) Detection: Use a flame atomic absorption instrument equipped with a nitrous oxide-acetylene combustion head to detect the aluminum element standard solution at these four absorption wavelengths, and it is found that when the wavelength of 309.3nm is used The detection sensitivity is high and the linearity is good, so 309.3nm is selected as the detection absorption wavelength of aluminum element.

[0032] Other conditions detected by atomic absorption method After testing, it is found that the detection effect is more accurate when the following parameters are used, fuel-assist ratio: 0.67; lamp current: 7.5mA; slit width: 0.5n...

Embodiment 2

[0034] The nitrous oxide-acetylene flame atomic absorption detection method for aluminum in jellyfish provided by this embodiment comprises the following steps:

[0035] (1) Digestion and constant volume of the sample: mash and homogenize the instant jellyfish sample, weigh 10g (accurate to 0.01g) into a 100mL Erlenmeyer flask, add 15mL nitric acid and 2mL perchloric acid, cover it overnight , place a small funnel on the triangular flask and place it on an electric furnace to heat and digest until white smoke is emitted, the digestive juice is white or slightly yellow, continue to heat to remove acid until the remaining volume is about 1mL, transfer the digestive juice to a 100mL volumetric flask, Wash the Erlenmeyer flask with ultrapure water, combine the washing solution into a 100mL volumetric flask, and dilute to volume with ultrapure water;

[0036] (2) Prepare aluminum element standard solution; use the aluminum element standard stock solution with a concentration of 100...

Embodiment 3

[0042] The nitrous oxide-acetylene flame atomic absorption detection method for aluminum in jellyfish provided by this embodiment comprises the following steps:

[0043] (1) Sample digestion and constant volume: Weigh 1 g (accurate to 0.01 g) of the homogenized jellyfish sample into a digestion tube, add 7.5 mL of concentrated nitric acid, cover the tube cap, and place it in a microwave digestion apparatus according to the setting. Set the digestion program for digestion. After the digestion is completed and the acid is removed, transfer it to a 10mL colorimetric tube to constant volume;

[0044] (2) Prepare aluminum element standard solution; use the aluminum element standard stock solution with a concentration of 1000 μg / mL to prepare a series of aluminum element standard solution with concentrations of 20, 40, 80, 120, 160, and 200 mg / L;

[0045] (3) Analyze the jellyfish sample solution to be tested in step (1) and the aluminum element standard solution in step (2) using a...

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Abstract

The invention discloses a method for detecting aluminum in jellyfishes through a nitrous oxide-acetylene flame atomic absorption method. The method comprises the following steps: (1) selecting a jellyfish sample to be detected and digesting by using a digestion solution to prepare a solution of the jellyfish sample to be detected; (2) preparing an aluminum element standard product solution; and (3) analyzing the solution of the jellyfish sample to be detected in the step (1) and the aluminum element standard product solution in the step (2) by using a flame atomic absorption instrument with a nitrous oxide-acetylene combustion head; drawing a standard curve by using the aluminum element standard product solution; and quantifying aluminum element in the solution of the jellyfish sample to be detected to obtain the content of the aluminum element in the solution of the jellyfish sample to be detected. The method can be used for detecting the high-content aluminum element in the jellyfishes and has small errors and high accuracy.

Description

technical field [0001] The invention belongs to the technical field of aluminum element detection, in particular to a nitrous oxide-acetylene flame atomic absorption detection method for aluminum in jellyfish. Background technique [0002] Jellyfish has the characteristics of high water content, easy decomposition and autolysis. A large amount of salt and alum are used in the process of pickling jellyfish. As a dehydrating agent, alum is widely used in jellyfish processing, but no better substitute and replacement process have been found yet. The addition of alum can improve the quality of the product to a certain extent, but adding too much alum will result in high residual aluminum, because aluminum is difficult to be excreted by the kidneys, which will poison the brain and nerve cells and induce Alzheimer's disease. In 1988, the World Health Organization officially identified aluminum as a food pollutant, and strictly controlled its use and residues, and proposed that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 杨贤庆岑剑伟李来好吴则业陈树立郝淑贤魏涯周婉君吴燕燕杨少玲
Owner SOUTH CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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