Method for measuring content of arsenic in edible oil by utilizing super-microwave digestion graphite furnace atomic absorption spectrometry
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.
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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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