Solution type	Acceptance criteria and comments
Calibration blank	To check the background contamination. There should not be any contamination
Sensitivity check standard	For determination of LOD and LOQ of the instrument
Standards (CRMs)	To check the linearity range of the instrument
Calibration blank	No contamination should be there in blank
Calibration verification standard	It should read between 80 and 120 %
Reagent blank	Should be lower than 10 times the acceptable limit of error for that particular analyte
Standard reference material	By matrix spiking. Recovery between 80 and 120 %
Establishment of LOD/LOQ for the method used	By replicate analysis of spiked samples at ppb level and after getting the LOQ value, practically demonstrated to get confidence in the method used
Samples	Absorbance should be <highest standard  % RSD of two readings should be ±20 % Recovery of spiked sample should be 80–120 % Values less than LOQ evaluated
SRM and calibration blank	Used for checking the instrumental performance in between the sample analysis