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Checking phosphorus levels in an alloy via spectrometer

Checking phosphorus levels in an alloy via spectrometer

Checking phosphorus levels in an alloy via spectrometer

(OP)
Is phosphorus levels hard to detect by a spectrometer and should the results vary, like from .001 to .003 on the same sample?

RE: Checking phosphorus levels in an alloy via spectrometer

1. What kind of alloy (steel, stainless steel, cast iron, etc.)?
2. What kind of spectrometer (be specific)?

One thing to keep in mind, P segregates in Fe/steel, so its local composition varies.

RE: Checking phosphorus levels in an alloy via spectrometer

(OP)
This is in NH41, An aluminum alloy for die casting.

RE: Checking phosphorus levels in an alloy via spectrometer

(OP)
The spectrometer is a shamadzu

RE: Checking phosphorus levels in an alloy via spectrometer

I am assuming you mean an Optical Emission Spectrometer such as the PDA-7000 series from Shimadzu.  As shown on page 6 of the .pdf file linked below (page 7 of the document), the range of P that can be detected in Al alloys is 0.001 to 0.02% by mass.  When extremely small amounts of elements like P are present in Al, it is common to see some variation in the detected concentration at the lower limit.  It is a common practice in indurtry to use a threshold of 0.005% by mass when reporting trace elements, meaning anything below 0.005% is reported as "< 0.005%" instead of 0.001 or 0.003, etc.

http://speceng.net/sitebuildercontent/sitebuilderfiles/catalog20of20optical20emission20spectrometer.pdf

 

RE: Checking phosphorus levels in an alloy via spectrometer

(OP)
my spectrometer is a shimadza OES-55OOII,Thanks for yor reply on this you have been very helpful, Thank you.

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