Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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How to make Lead Pb standards for XRF instrument (2 replies and 1 comment)

Sandy
7 years ago
Sandy 7 years ago

Hello everyone,

I'm new in using XRF instrument and I need to invistigate any lead contamination in powdered samples  that should not exceed 10ppm of lead . However,  I need to makeup some sort of compostion as solid phase standard contains right concentration of lead. what condition is required ? any idea about to to make the right lead standard to calibrate the instrument ? some says grinding slice in lead salt or spike with dead solution !!

 

thanks in advance 

P
Paul Diemer
7 years ago
Paul Diemer 7 years ago
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1 like by David

Hi Sandy. It has been many years since I worked with XRF Spectrometry but when I needed to make a up a standard for a specific element I would use pure ground silica powder. After presenting a pellet of the pure silica to the machine, to verify if it contained any elements that might interfere, I would mixed weighted percentages of the element in question with the silica and thus produce a range of standards to calibrate against. I don't know just what XRF machine you are using but the one I used, this was in the early 1970's, it required the powdered sample to be pressed into a pellet. Don't know if my ancient experience will help you but there it is.

P
Paul Diemer
7 years ago

Another way is to acquire about 15 to 20 samples of the material you are working with. Make sure they contain a, fairly wide, range of Pb content by assay, either AA or chemical procedures. Then prepare and read all these samples with your XRF equipment and compare the readings with the actual assays by application of the "Least Squares" calculations and thus establish a mathematical factor

David
7 years ago
David 7 years ago
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Hi, my contacts from http://www.northernani.com/ referred my to 

https://www.nist.gov/srm and

https://www.nrcan.gc.ca/mining-materials/certified-reference-materials/7827

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