I have reviewed in the literature "experimental correlations" of Ra with species (calcium, sulfate, etc). However, the linear adjustments are not the most satisfactory in analytical terms. Are there other ways of correlations ionic species?.
Greetings. Ender
Please provide information concerning the unsatisfactory adjustments.
Radium is a trace ion in oil production waters. Trace means it is below a concentration of about a few parts per million. The chemistry of trace ions cannot be predicted without the presence of a suitable carrier.
From my prior personal experience in industry, the concentration of radium relative to other alkaline earth ions will vary significantly between different geological formations (& between depths of a given formation.
Even for produced waters from within a given formation at similar depth, I would want to have experimental evidence of correlation between radium & other alkaline earths for several samples before making assumptions about radium concentrations in future water samples from that formation/depth.
Dear Jack, it is completely correct! I believe that the correlations are oriented with respect to the geological formation, but I have observed that in the literature we try to make correlations (in the context of oil production waters), for example, between Ra-226 versus Ca, and this is where my uncertainty lies, because I think it is not right to try to find a linear correlation between radium and other ions such as magnesium, strontium, sulphate and bicarbonate. Possibly you can find interesting relationships with the barium due to its similarity of periodic properties, but it would be ignoring the geological context !. However, most of the water I have analyzed have values below 1 ppm of barium.
Regards, Ender
Dear Joseph, the radium values found in the production waters have been determined by gamma spectrometry due to their low concentration in relation to the ordinary concentration of ions such as sodium, chlorine or calcium (for example Na+ ~104 ppm and 226Ra+2 ~ 10 -10 ppm).
Once the physical-chemical characterization of the formation waters and the concentration of the radio have been obtained. Is it possible to make correlations between the physical chemistry and radiochemistry? Why?
Regards, Ender
Dear Ender,
Did you manage to find a satisfactory correlation?
This is a late comment to the question, but it is important to remember that Radium comes from the U and Th decay chains, they are the provider of this element.
Try taking the ratio e.g. 226Ra/238U to first normalize the concentration, since, high U concentrations will almost always lead to high Ra concentrations, no matter what sample you are looking at.
After that, you can try to find a correlation with any other parameter you have measured through e.g. HCA or PCA.
Manganese (and Iron) is an element that is used in the radiochemical procedures of concentrating Radium, might be worth considering also.
Kind regards
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