Thorium dioxide powder and method for determining nitrogen content in core block
A kind of technology of thorium dioxide and determination method, applied in the field of chemical detection
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Embodiment 1
[0035] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:
[0036] The first step: sample preparation;
[0037] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.
[0038] The second step: sample dissolution;
[0039] Weigh 0.1 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put it in a 100mL beaker, add 5mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, the density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 350°C, and when the sample starts to react, add 0.05mL of 3 After the reaction is still, add 0.15mL of 30% pure hydrogen peroxide, and dissolve until the solution becomes clear. Continue heating to completely decompose hydrogen peroxide. Remove and let c...
Embodiment 2
[0049] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:
[0050] The first step: sample preparation;
[0051] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.
[0052] The second step: sample dissolution;
[0053] Weigh 0.5 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put it in a 100mL beaker, add 5.5mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, the density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 400°C, and when the sample starts to react, add 0.075mL of 3 0.35 mL of high-grade pure hydrofluoric acid with a mass percentage of 30% was added after the reaction was still, and dissolved until the solution became clear. Continue heating to completely...
Embodiment 3
[0060] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:
[0061] The first step: sample preparation;
[0062] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.
[0063] The second step: sample dissolution;
[0064] Weigh 1.0 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put in a 100mL beaker, add 6mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 450°C, and when the sample starts to react, add 0.1mL of 3 After the reaction is still, add 0.5mL of 30% pure hydrogen peroxide, and dissolve until the solution becomes clear. Continue heating to completely decompose hydrogen peroxide. Remove and let cool.
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Abstract
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