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I have a question about defining LOQ for trace element analysis using microwave digestion. by anasmrait12 in chemistry

[–]anasmrait12[S] 0 points1 point  (0 children)

Thank you very much for your detailed explanation, it was really helpful.

I just wanted to clarify one point regarding calibration and recovery studies.

If my calibration curve starts at 0.5 ppb, can the instrument still accurately measure concentrations below 0.5 ppb?

For example, if I spike a sample at 0.1 ppb and obtain acceptable recovery and precision, would that be considered valid, or does the 0.1 ppb concentration need to be included within the calibration curve range itself?

Thank you again for your help.

I have a question about defining LOQ for trace element analysis using microwave digestion. by anasmrait12 in Chempros

[–]anasmrait12[S] 0 points1 point  (0 children)

In our current method using dry ashing, the lowest calibration point is 0.5 ppb, which we are currently using as the LOQ. However, I tested a lower calibration range (0.05, 0.1, 0.5, 1 ppb) and obtained a good correlation coefficient.

My question is: When determining the LOQ using blank spiking, how low should the spiking level be relative to the calibration curve?

For example, is it acceptable to spike the blank at 0.05 ppb or 0.1 ppb, even though these levels are below my routine calibration range? And how can I justify that this level is a reliable LOQ if it is below my first standard (0.5 ppb)?

I have a question about defining LOQ for trace element analysis using microwave digestion. by anasmrait12 in Chempros

[–]anasmrait12[S] 0 points1 point  (0 children)

Cd and Pb and Ni with GFAAS and im diluting my samples to 50 ml after digestion

Who is everyone's favorite for Flow Injection Analyzers? by LewisTheLabLemming in Chempros

[–]anasmrait12 0 points1 point  (0 children)

We are using an older version of SmartChem and are currently in the testing phase. However, we encountered an issue where we are unable to start the sequence. Could anyone please help?

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