Inorganic arsenic extraction method, method for determination of inorganic arsenic in rice and application of inorganic arsenic extraction method
An extraction method and inorganic arsenic technology, applied in the field of chemical analysis and detection, can solve the problems of high purchase and use cost of instruments, time-consuming, poor analysis specificity, etc. Effect
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Embodiment 1
[0032] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.
[0033] Add 20mL of inorganic arsenic extract (which contains 4% hydrochloric acid, 8g / L potassium iodide and 4g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner at a frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.
[0034] Prepare standard series solutions of As(Ⅲ) with concentrations of 0 μg / L, 1 μg / L, 2 μg / L, 4 μg / L, 8 μg / L, and 10 μg / L, and the constant volume solvent is 4% hydrochloric acid.
[0035] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure and obta...
Embodiment 2
[0038] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.
[0039] Add 20mL of inorganic arsenic extract (which contains 6% hydrochloric acid, 12g / L potassium iodide and 6g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner with an ultrasonic frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.
[0040] Prepare standard series solutions of As(Ⅲ) with concentrations of 0μg / L, 1μg / L, 2μg / L, 4μg / L, 8μg / L, and 10μg / L, and the constant volume solvent is 6% hydrochloric acid.
[0041] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure...
Embodiment 3
[0044] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.
[0045]Add 20mL of inorganic arsenic extract (which contains 5% hydrochloric acid, 10g / L potassium iodide and 5g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner at a frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.
[0046] Prepare standard serial solutions of As(Ⅲ) with concentrations of 0 μg / L, 1 μg / L, 2 μg / L, 4 μg / L, 8 μg / L, and 10 μg / L, and the constant volume solvent is 5% hydrochloric acid.
[0047] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure and obta...
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