Pyrolysis-chemical vapor generation sampling device and analysis method for element determination
A technology of a vapor generation and sample injection device, which is applied in the field of instrument analysis, can solve problems such as production stoppage detection tasks, contamination and scarring, and complicated devices, and achieves the effects of ensuring precision and accuracy, low maintenance costs, and simple and practical devices.
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Embodiment 1
[0049] Elemental determinations are performed using the first preferred embodiment device. Accurately draw 0.1 ml of water sample into a small glass beaker, then add 0.05 ml of 10% sodium formate and 0.05 ml of 10% thiourea to the water sample. Then place the small beaker on the platform of the support frame, put the liner on, quickly put the sample and the liner into the heating chamber that has been heated to 500°C for pyrolysis, and carry out the pyrolysis under the flow rate of carrier gas (argon) at 300 ml / Under the condition of 10 minutes, the element volatiles produced by pyrolysis are directly sent to the atomic fluorescence instrument for detection without condensation and other purification devices (the atomic fluorescence atomizer and a hydrogen vapor generator generate 250 ml / min of hydrogen vapor generator to provide a source of hydrogen for proper ignition of the atomizer). The content of arsenic, mercury, antimony, and bismuth in water was determined by the ex...
Embodiment 2
[0051] Elemental determinations are performed using a second preferred embodiment. Accurately draw 0.1 ml of gold-containing sample solution into a small glass beaker, and then add 0.05 ml of 15% sodium borohydride aqueous solution to the water sample. Then place the small beaker on the platform of the support frame, put the liner on, quickly put the sample and the liner into the heating chamber that has been heated to 600°C for pyrolysis, and carry out the pyrolysis at the flow rate of the carrier gas (argon) at 250 ml / Under the condition of 10 minutes, the elemental volatiles produced by pyrolysis were sent to the electrothermal quartz tube atomic absorption spectrophotometer to be detected. The gold content in the sample solution was determined by the external standard method, and the measured results were in good agreement with the ICP-AES method.
Embodiment 3
[0053] Elemental determinations are performed using a third preferred embodiment. Accurately draw 0.1 ml of zinc and cadmium sample solution into a 25 ml test tube, and then add 0.05 ml of 15% hydrogen iodide aqueous solution to the water sample. Then place the small beaker on the platform of the support frame, put the liner on, quickly put the sample and the liner into the heating chamber that has been heated to 600°C for pyrolysis, and carry out the pyrolysis at the flow rate of the carrier gas (argon) at 250 ml / Under the condition of 10 minutes, the elemental volatiles produced by pyrolysis were sent to the electrothermal quartz tube atomic absorption spectrophotometer to be detected. The gold content in the sample solution was determined by the external standard method, and the measured results were in good agreement with the ICP-MS method.
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