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Determination method for detecting chromium element in fish feed product by fusion-plasma spectral method

A technology of plasma spectroscopy and fish feed, applied in the field of analysis and determination of chromium in fish feed samples, can solve the problems of incomplete chromium oxidation, cumbersome, time-consuming, etc., and achieve high accuracy, simple operation steps, and complete sample decomposition Effect

Inactive Publication Date: 2018-11-27
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method one provided by GB / T 13088-2006 is only applicable to the detection of chromium at the ug / kg level in the feed; the second method uses potassium permanganate to oxidize the ashed feed sample to hexavalent chromium and then reacts with diphenylamino Colorimetric reaction with urea, this method is time-consuming and cumbersome, and there is also the risk of incomplete chromium oxidation, resulting in low chromium detection results
We have also used wet digestion-inductively coupled plasma atomic emission spectrometry [China Inorganic Analytical Chemistry, 2017, 7(2): 72-77] or flame atomic absorption spectrophotometry [spectroscopy and spectral analysis , 2005, 25(07): 1142-1144] Determination of the chromium content of the specially configured fish feed in the grass carp digestion experiment (the content of chromium is mg / kg level); but the experimental results indicate that the above method still cannot completely decompose the fish feed sample , small particles of fish feed in the liquid to be tested are visible to the naked eye

Method used

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  • Determination method for detecting chromium element in fish feed product by fusion-plasma spectral method
  • Determination method for detecting chromium element in fish feed product by fusion-plasma spectral method
  • Determination method for detecting chromium element in fish feed product by fusion-plasma spectral method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown, the steps of the present invention are as follows:

[0031] Weigh 1.000-5.000g of the fish feed sample to be tested in a corundum crucible, put the crucible in a muffle furnace at room temperature for ashing, raise the temperature to 500-550°C, keep it warm for at least 2 hours, and take it out to cool;

[0032] Add 3-4g of mixed flux of sodium peroxide and sodium carbonate to the crucible that has been cooled to room temperature, stir well, then place the crucible in a muffle furnace at 700-750°C, decompose for 15 minutes, take it out and cool;

[0033] Move the crucible cooled to room temperature into a 200mL glass beaker, add 25% ( v / v ) nitric acid solution 50mL, then put the beaker on the electric heating plate, extract the sample, 2% ( v / v ) Wash out the crucible with nitric acid solution, cool it down, and set the volume in a 100mL volumetric flask;

[0034] Take 5.00mL of the solution after constant volume, put it in a 50.0mL volumetr...

Embodiment 2

[0041] The steps of the present invention are as follows:

[0042] Weigh 1.000-5.000g of the fish feed sample to be tested in a corundum crucible, put the crucible in a muffle furnace at room temperature for ashing, raise the temperature to 500-550°C, keep it warm for at least 2 hours, and take it out to cool;

[0043] Add 3-4g of mixed flux of sodium peroxide and sodium carbonate to the crucible that has been cooled to room temperature, stir well, then place the crucible in a muffle furnace at 750°C, decompose for 15 minutes, take it out and cool;

[0044] Move the crucible cooled to room temperature into a 200mL glass beaker, add 25% ( v / v) nitric acid solution 50mL, then put the beaker on the electric heating plate, extract the sample, 2% ( v / v ) Wash out the crucible with nitric acid solution, cool it down, and set the volume in a 100mL volumetric flask;

[0045] Take 5.00mL of the solution after constant volume, put it in a 50.0mL volumetric flask, add 2% ( v / v ) Nitri...

Embodiment 3

[0052] The steps of the present invention are as follows:

[0053] Weigh 1.000-5.000g of the fish feed sample to be tested in a corundum crucible, put the crucible in a muffle furnace at room temperature for ashing, raise the temperature to 500-550°C, keep it warm for at least 2 hours, and take it out to cool;

[0054] Add 3-4g of mixed flux of sodium peroxide and sodium carbonate to the crucible that has been cooled to room temperature, stir well, then place the crucible in a muffle furnace at 700-750°C, decompose for 15 minutes, take it out and cool;

[0055] Move the crucible cooled to room temperature into a 200mL glass beaker, add 25% ( v / v ) nitric acid solution 50mL, then put the beaker on the electric heating plate, extract the sample, 2% ( v / v ) Wash out the crucible with nitric acid solution, cool it down, and set the volume in a 100mL volumetric flask;

[0056] Pipette 25mL sample solution, blank solution, and chromium standard series solution into the strong cati...

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Abstract

The invention discloses an analytical method for detecting chromium element in a fish feed product by a fusion-plasma spectral method. The method comprises the special determination flows: weighing acertain amount of fish feed in a corundum crucible, putting the corundum crucible in a muffle furnace and ashing the corundum crucible from a constant temperature to 500 DEG C and keeping the temperature for 2 hours; taking out the corundum crucible and cooling the corundum crucible to constant temperature; adding a mixed solvent of sodium peroxide and sodium carbonate; then putting the crucible in the muffle furnace at 700 DEG C, decomposing the mixture for 15 min, and taking out the crucible and cooling the crucible to constant temperature; carrying out extraction with 25% (v / v) nitric acid,and carrying out cooling and volume fixing in a 100 mL volumetric flask; and diluting the mixture and detecting the mixture with a plasma spectrum. By treating the fish feed sample by means of the fusion method and determining the chromium content with the plasma spectrum, the method has the advantages of being simple in sample processing flow and thorough to decompose and the like, and is suitable for detecting chromium element, the concentration content of which is mg / kg level, in a fish feed product.

Description

technical field [0001] The invention relates to a technique for analyzing and measuring chromium in fish feed samples. The specific operation is to decompose the fish feed samples by melting method, and measure the chromium content in the fish feed with a plasma spectrometer. Background technique [0002] The mineral element chromium is an essential trace element for fish. The lack of chromium can not only affect the normal growth of fish, but also reduce the immune and disease resistance of fish. Therefore, chromium is usually added to the feed. With the circulation of the biological chain, the chromium accumulated in the fish body is finally absorbed by humans. When the human body takes in too much chromium, it will affect the body's antioxidant system and induce diseases such as diabetes, high blood pressure, and even tumors. Therefore, it is very necessary to monitor the content of chromium in fish feed. At present, the method one provided by GB / T 13088-2006 is only ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/44
CPCG01N1/44G01N21/73
Inventor 卢彦杨发树李可及李刚
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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