What are the differences between systematic and random errors and how do they effect accuracy and precision?
In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample?
A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus
The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation:
y = 44.72x + 4.06
what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?
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