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Method for analyzing fluorine ion concentration under radioactive condition

An analytical method and radioactive technology, applied in the field of analysis of fluoride ion concentration under radioactive conditions, can solve the problems of unreported, slow dissolution rate, etc.

Active Publication Date: 2015-06-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Philip A.Anderson used fluoboric acid instead of mercury nitrate to catalyze the dissolution of uranium-aluminum alloys. The research found that with the increase of the concentration of fluoboric acid and nitric acid, the dissolution rate of aluminum is faster, but if no fluoboric acid is added, the dissolution rate is very slow. The researcher It is considered that its dissolution is carried out according to the reaction formula (1)-(3); as can be seen from the reaction formula (1)-(3), HF plays a vital role in the dissolution of aluminum, but in such a high acid, high The analysis method of fluoride ion under radioactive conditions such as aluminum has not been reported yet

Method used

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  • Method for analyzing fluorine ion concentration under radioactive condition
  • Method for analyzing fluorine ion concentration under radioactive condition
  • Method for analyzing fluorine ion concentration under radioactive condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Preparation of total ionic strength adjustment buffer solution (TISAB for short): prepare a mixed solution of sulfosalicylic acid and trisodium citrate, and adjust the pH to 9 with ammonia water;

[0072] (2) Preparation of F ion standard solution:

[0073] Prepare F ion standard solution A (concentration is 0.5mol / L): Accurately weigh 2.0995g of reference NaF (pre-dried at 105°C to 110°C for more than 2h), dissolve it in deionized water and set to volume in a 100mL volumetric flask;

[0074] Prepare F ion standard solution B (concentration is 0.1mol / L): accurately pipette 20mL F ion standard solution A into a 100mL volumetric flask, and dilute to volume with deionized water;

[0075] Prepare F ion standard solution C (concentration is 0.01mol / L): accurately pipette 10mL F ion standard solution B into a 100mL volumetric flask, and dilute to volume with deionized water;

[0076] (3) Prepare aluminum nitrate solution, uranyl nitrate and nitric acid solution:

[0077...

Embodiment 2

[0086] On the basis of Example 1, for HBF 4 The dissociation of fluoride ions in the solution was analyzed.

[0087] Prepare total ionic strength adjustment buffer solution (TISAB for short): prepare mixed solution, wherein the concentration of sulfosalicylic acid is 0.5mol / L, the concentration of trisodium citrate is 0.3mol / L, and adjust pH8.5 with ammonia water;

[0088] Take 0.5mL (V 样品 ) with a concentration of 0.01mol / L of HBF 4 solution in V x =50mL volumetric flask, then add 25mLTISAB, 0.32mL nitric acid solution with a concentration of 2mol / L, 1mL aluminum nitrate solution with a concentration of 1mol / L, 1mL uranyl nitrate solution with a concentration of 0.01mol / L, and then deionized The water is fixed to 50mL; then it is completely transferred to the measuring cup, and the solution potential E is measured with an ion meter (ion meter: equipped with a fluoride ion selective electrode, a glass electrode and a reference electrode, accurate to 0.1mV) 1 (230.83mV); Ad...

Embodiment 3

[0091] Prepare total ionic strength adjustment buffer solution (TISAB for short): prepare mixed solution, wherein the concentration of sulfosalicylic acid is 0.3mol / L, the concentration of trisodium citrate is 0.3mol / L, and adjust pH8 with ammonia water;

[0092] Get the F ion standard solution B 0.5mL (V 样品 ) at V x=50mL volumetric flask, then add 25mL TISAB, 0.32mL concentration is 2mol / L nitric acid solution, 0.25mL concentration is 1mol / L aluminum nitrate solution, then add 1mL concentration is 0.005mol / L uranyl nitrate solution ( 0.01mol / L uranyl nitrate solution diluted 2 times) and then dilute to 50mL with deionized water; electrode, accurate to 0.1mV) to measure the solution potential E 1 (159.38mV); Add the prepared F ion standard solution (concentration is Cs) B 0.5mL (V 1 ), the solution potential E was measured with an ion meter 2 (142.67mV); Continue to add the prepared F ion standard solution (concentration is Cs) A 1mL (V 2 ), the solution potential E was m...

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Abstract

The invention belongs to the technical field of radioactive substance processing methods, and particularly relates to a method for analyzing fluorine ion concentration under a radioactive condition. The method is characterized in that a fluorine ion selective electrode method is adopted, by using sulfosalicylic acid-trisodium citrate as a total ion strength regulation buffer solution, the calculation is carried out by using a secondary standard addition method under a condition that pH is 8-9 so as to obtain F-concentration in an original sample. Aiming at the sample containing BF<4><->, the method provided by the invention has the advantages that complexing action on the ion F by the ion Al is skillfully utilized to ensure that BF<4><-> is completely hydrolyzed; in an analyzing process, distillation operation is avoided, and the loss of radioactive substances is reduced; moreover, a value of a slope S is not needed, and therefore, the errors caused by improper setting of the slope S can be avoided.

Description

technical field [0001] The invention belongs to the technical field of radioactive substance processing methods, in particular to an analysis method for fluoride ion concentration under radioactive conditions. Background technique [0002] Aluminum-uranium alloys are the most commonly used HEU spent fuel. due to fuel 235 U enrichment is high; therefore criticality safety issues are more prominent. Most of the dissolution is based on the size limit of the set of dissolution equipment, supplemented by safety measures such as neutron poisons and fissile nuclide concentration limits. [0003] In the aluminum-uranium alloy element, the main component is cladding and alloy component aluminum, which accounts for more than 90% of the total weight, and uranium only accounts for 2.8-5%. It can be seen that the dissolution of this fuel element is actually the dissolution of aluminum. Since aluminum is an amphoteric metal, it is soluble in both acid and alkali, but in strong nitric ...

Claims

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Application Information

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IPC IPC(8): G01N27/49
Inventor 文明芬冯孝贵陈靖
Owner TSINGHUA UNIV
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