Hello everyone:
I will do some calibration curve using an electrometrical method, but I got confused: I know exactly how to make a direct calibration, but I don't understand the difference between standard addition and internal standard and pattern addition calibration curve. Please, I need some help.
Thanks ;)
Hi Tatiana
what I can understand, internal standard is used to solve problem of matrix effect in the instruments. for example we used Lithium as internal standard in icp-oes. matrix effect will happen when amount of acid in the standard solution and sample is different. so internal standard come to solve this effect. standard addition related with spiking. Normally I will set standard addition at win lab sofware when read spike sample at AAS. standard addition is different method with direct calibration curve
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