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Regarding minerological analysis

  1. Mar 22, 2016 #1
    why we need to find the minerals in the sediments while estimating the amount of radionuclides. although there exist a cation exchange capacity in the minerals, do they actually concentrate the primordial radionuclides in them.
    further on granulometric analysis, do the clay particles retain the radionuclides and how?
     
  2. jcsd
  3. Mar 25, 2016 #2

    DrDu

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    Maybe you could provide some more background. Which primordial radionuclides do you mean? Basically, there is only uranium and thorium. Thorium is almost insoluble, but the solubility of uranium depends on it's oxidation state (namely IV, which is insoluble and VI, which is soluble). The oxidation state depends on the pH of the solution, the amount of carbonate and the presence of reducing agents in the soil/ mineral with which the solution is in contact, like organic mater or inorganic carbon which may reduce the U VI to U IV.
     
  4. Mar 28, 2016 #3
    Uranium can exist in five oxidation states: +2, +3, +4, +5 and +6. However, only the +4 and +6 states are stable enough to be of practical importance. Tetravalent uranium is reasonably stable and forms hydroxides, hydrated fluorides and phosphates of low solubility. Hexavalent uranium is the most stable state and the most
    commonly occurring form is U3O8. this is what i had read it one of the page in internet. i request you to help me to find the exact answer for this.
     
  5. Mar 29, 2016 #4

    DrDu

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    So what precisely is your question?
     
  6. Mar 29, 2016 #5
    which oxide is responsible for the increase of uranium -238 in the sediments of rivers. is it U(IV) oxide is soluble or U(VI) is soluble in water?
     
  7. Mar 29, 2016 #6

    DrDu

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    I would expect mainly pitchblende UO2, which is a Uranium-IV oxide.
     
  8. Mar 29, 2016 #7

    DrDu

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    Uranium-VI is very soluble in water.
     
  9. Mar 29, 2016 #8
    thank you for the clarification.
     
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