Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD 2017-04-04T06:57:57+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Assaying, Microscopy, Mineralogy & XRF/XRD.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Analysis of Halogens in geochemical samples Cl- , Br- and I- (3 replies)

Maya Rothman
2 years ago
Maya Rothman 2 years ago

I have been trying to analyse halogens (five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)) in soil & sediment samples at LLDs 0.5 ppm for iodine, 15 ppm for chlorine. I am able to get reproducible results for iodine above 1.5ppm & in case of chlorine reproducible results are observed in samples having concentration 50ppm or more. In case of pellets of samples having chlorine concentration less than 50 ppm enhancement of signal/concentration was observed with every exposure untill the pellet gave a value of 50ppm, thereafter it remained stable.  I am using methyl acrylate in acetone(5% solution) as binder.

Helena Russell
2 years ago
Helena Russell 2 years ago

Analysing chlorine in pressed pellets by using of wet binding material often gives erroneously high results, because soluble in water chlorine concentrated on the surface of pellet during drying of the pellet. Enhancement of the signal in repeated exposure to x-rays may have similar reason.

Alan Carter
2 years ago
Alan Carter 2 years ago

For the pellets, is the loss of chlorine due to exposure to the x-rays, or due to exposure to moisture in the air? I would suggest that you may want to try using a fairly high concentration of a liquid polymer binder to "seal" the powder particles from the environment. It may also help to contain the chlorine in the sample if the loss is due to exposure to x-rays.

2 years ago
JohnnyD 2 years ago

Your results are perfectly reasonable given the calculated LLD's you reported for your set up( instrument, application set up , sample prep etc.) Typically reproducible results can be obtained at 3-5 times higher concentration than the LLD, which is about what you are reporting. Remember that the LLD is not the LOQ, but where the analyte peak disappears into the background. Its all about counting statistics of the counts above background. That is not to say that your application could not be improved to obtain better the levels of quantification, but all else equal you are obtaining the reasonable results based on the your LLD's.

Please join and login to participate and leave a comment.


BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.