Hi, Shivani,
Jincai is correct that the lower limits of detection and quantification and upper limit of quantification are variable and depend on the analytical methods used, the matrix that is being analyzed, the preparation technique, the instrumentation method, and the instrumental settings. With ICP-MS (the instrument I'm most familiar with) and the correct settings, you can probably get down to fractions of parts per billion, depending on the other factors mentioned above (but without performing the experiments to determine it through some form of validation, any number we could give you would only be estimates).
What he's getting at is that we need more information in order to provide you with an answer. Is there a particular part of the human body you're interested in? Blood, serum, organ tissue, etc? What instrumental technique are you working with?
Sorry if I can't provide you with a solid answer, but I hope this is helpful!
Hi Shivani
There are several parameters affecting the limit of detection. Which method do you use? Where do you analyze Pd? Urine, blood or serum?
I understand you are talking about Occupational Health and Safety issues. Pd can be found in jewelry and dental alloys. Its possible toxicity for humans is investigated since early 1980's. No MAK values are still established, not for elemental Pd nor for bioavailable species such as nitrates, acetates or chlorides. For the latter there is some evidence to drive allergic reactions on skin and respiratory apparatus.
You may check Helmut Greim's series MAK value documentations.
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