Method for measuring contents of thallium in agricultural products by aid of graphite furnace atomic absorption spectrometry
A technology of absorption spectroscopy and graphite furnace atom, which is applied in the field of content determination, can solve the problem of not formulating thallium content detection standards and safety limit standards, etc., and achieves good application effects and quality assurance effects.
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Embodiment 1
[0074] Weigh 2 g of coix seed sample (accurate to 0.001 g), put it in a 250 mL Erlenmeyer flask, add 20 mL of nitric acid + perchloric acid solution (4+1, V+V), cover it and soak overnight, put it on the heating plate Digest until white smoke is emitted, the solution is colorless, transparent or slightly yellow, continue to rinse the acid until the digestion solution is about 0.5 mL, then remove it, cool to room temperature, transfer it to a 25 mL volumetric flask with pure water, and dilute to Scale, shake well, place to be tested, and make reagent blank at the same time.
[0075] The heating program parameters of the graphite furnace are: drying temperature 110°C (30s), ashing temperature 700°C (20s), atomization temperature 1700°C (5s), purification temperature 2400°C (3s).
Embodiment 2
[0077] Weigh 3g of coix seed sample (accurate to 0.001g), put it in a 250 mL Erlenmeyer flask, add 20 mL of nitric acid + perchloric acid solution (4+1, V+V), cover and soak overnight, put it on the electric heating plate Digest until white smoke is emitted, the solution is colorless, transparent or slightly yellow, continue to rinse the acid until the digestion solution is about 0.5 mL, then remove it, cool to room temperature, transfer it to a 25 mL volumetric flask with pure water, and dilute to Scale, shake well, place to be tested, and make reagent blank at the same time.
[0078] The heating program parameters of the graphite furnace are: drying temperature 110°C (30s), ashing temperature 700°C (20s), atomization temperature 1700°C (5s), purification temperature 2400°C (3s).
Embodiment 3
[0080] Weigh 4 g of cabbage sample (accurate to 0.001 g), put it in a 250 mL Erlenmeyer flask, add 30 mL of nitric acid + perchloric acid solution (4+1, V+V), cover and soak overnight, and then put it on a heating plate for digestion , until white smoke comes out, the solution is colorless, transparent or slightly yellow, continue to wash the acid until the digestion solution is about 0.5 mL, then remove it, cool to room temperature, transfer it to a 25 mL volumetric flask with pure water, and dilute to the mark , shake well, place to be tested, and make reagent blank at the same time.
[0081] Graphite furnace heating program parameters are: drying temperature 130°C (20s), ashing temperature 700°C (20s), atomization temperature 1700°C (5s), purification temperature 2450°C (3s).
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