Method for measuring content of arsenic in edible oil by utilizing super-microwave digestion graphite furnace atomic absorption spectrometry
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A technology of super microwave digestion and graphite furnace atomization, which is used in the measurement of color/spectral characteristics and the preparation of test samples to achieve the effects of enhanced signal response, strong digestion ability and simple operation.
Active Publication Date: 2015-07-01
INSPECTION & QUARANTINE TECH CENT OF GUANGDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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[0008] The technical problem to be solved in the present invention is to provide a method for measuring the arsenic content in edible oil by super microwave diges
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Embodiment 1
[0038] All glassware in this example need to be soaked in 20% HNO3 for 24 hours, rinsed repeatedly with water, and finally rinsed with deionized water and dried before use. All reagents are of superior grade or above.
[0039] This embodiment provides a method for determining the content of arsenic in edible oil by super microwave digestion-graphite furnace atomic absorption spectrometry, and the specific steps are as follows:
[0040] S1. The sample is pre-treated by super microwave digestion to obtain a digestion solution;
[0041] S2. After the digestion is completed, cool down and release the pressure, take out the digestion tube, rinse with acid at 110°C for about 15 minutes, directly adjust the volume to the 10mL mark with deionized water, mix well, and wait for the test.
[0042] S3. detect the arsenic content in the sample solution obtained in S2;
[0043] Wherein, the super microwave digestion pretreatment of the sample described in S1 super microwave digestion incl...
Embodiment 2
[0058] The accuracy experiment of embodiment 2 inventive method:
[0059] Weigh about 0.3g of edible oil sample (accurate to 0.001g) into a quartz digestion tube, and add 3mL of concentrated nitric acid. Then add 0.10mL, 0.30mL and 1.0mL arsenic standard solution with a concentration of 100ng / mL, i.e. 1ng / mL, 3ng / mL, 10ng / mL three concentration levels for standard addition recovery experiments, each concentration level and sample background Six parallel tests were performed. At the same time do a blank test. Leave it overnight, add a small amount of deionized water, cover with a polytetrafluoroethylene cover, and put it into the sample holder and super microwave digestion instrument. Lock the tank, add inert gas (nitrogen) in advance, the pressure is 40bar, the temperature of the outer cavity is ≤40°C, and the temperature rise program (see Table 1) is set for digestion. Draw the standard working curve according to the working conditions of the instrument, and then test the ...
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Abstract
The invention discloses a method for measuring the content of arsenic in edible oil by utilizing a super-microwave digestion graphite furnace atomic absorption spectrometry. The method disclosed by the invention comprises the following steps: performing super-microwave digestion on an edible oil sample by adopting a transparent and stable quartz tube, and measuring the content of the arsenic in the edible oil by utilizing the graphite furnace atomic absorption spectrometry. According to the method, a super-microwave technology is applied to measuring the trace arsenic in the edible oil, the operation is safe and easy, the digestion capacity is high, the edible oil samples can be simply and efficiently digested, the target analyte loss and pollution caused by the transfer process can be effectively eliminated, potassium borohydride and other substances with high toxicity are not needed, and the graphite furnace atomic absorption spectrometry is further combined to be applied to measuring the trace arsenic in the edible oil. According to the method disclosed by the invention, the linearity range ranges from 0 to 40ng/mL, the quantification limit is 0.033mg/kg, and the recovery rate is 86.8-101.4 percent. The operation is easy, accurate, rapid and sensitive, the content of the arsenic in the edible oil can be accurately measured, and the body health of consumers can be effectively guaranteed.
Description
technical field [0001] The invention relates to the technical field of food detection, in particular to a method for determining the arsenic content in edible oil, and more specifically, to a method for determining the arsenic content in edible oil by using super microwave digestion graphite furnace atomic absorption spectrometry. Background technique [0002] Edible oil is a necessity in daily life, and its quality and safety are closely related to our health. The main sources of heavy metal pollution are waste residues from mining and smelting, industrial wastewater from metallurgy, chemicals, pesticides, dyes and tanning, and wastewater from geothermal power plants. These reasons may cause heavy metal elements in peanuts, soybeans, rapeseed and other oil crops to exceed the standard. In addition, edible oil may also be polluted by heavy metals during production, processing, transportation, and storage. Arsenic is a highly toxic heavy metal element. Existing studies have...
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IPC IPC(8): G01N21/31G01N1/44
Inventor 卢丽系星林陈永红张旺邹志飞刘江晖谢湘娜姚红覃小燕颜小慧
Owner INSPECTION & QUARANTINE TECH CENT OF GUANGDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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