ACS Analytical Chemistry (100% error-free) 2024.

standard deviation (s) correct answers the square root of the variance % relative standard deviation (%RSD) correct answers Standard deviation divided by mean times 100 Grubbs test (Gcalc) correct answers |Questionable value - mean/ std dev| If that is larger than the Gtable value then the value is thrown out. Locate Gtable value based on number of values in data set. Used to define outliers z score correct answers (x- xavg)/s F Test correct answers used to compare precision (s2)^2/(s1)^2 (should always be 1) Use n-1 to find on table. Fcalc Ftable -- There is some noise or error External standard correct answers use standard solutions spanning a range of conc, measure response Internal standard correct answers substance similar to analyte (ie deuterated); used to normalize signal by reducing random error Standard Addition correct answers ideal for analyzing sample in a complex matrix; add known standard to constant amount of sample; x-int =[sample] Box car average correct answers minimizes distance between data points and best fit line/ minimizes standard deviation Limit of detection (LOD) correct answers 3*std dev Limit of quantitation (LOQ) correct answers 10* std dev sigma-- sigma* absorbs at correct answers ~100nm proteins absorb at correct answers ~ 280 nm (bc of aromatic R groups) d--d absorb correct answers visible light (transition metals)