170135_inorganicventures_flipping

• Calibration curve uses 0ppm, 0.1ppm, & 1.0ppm STDs • 2 x peak-to-peak noise for LOD • We’d rather report more impurity information than to say an element is not detected just to make the purity look better • Quicker calculation: Easy to visually inspect spectra and quickly enter actual count data. Don’t have time to center peaks and correct background point for each element. • Easier when evaluating complex spectra • No internal standards used yet • Would have to allow for different IS elements What IV does on the OES

Our LOD Calculation on OES

1.0ppmMg

1,727,150 cps 0.1ppmMg

Max

Max: 56,523 cps Min: 55,460 cps

Min

56,011 cps BKG

DL Calculation: !.#$$% (#,()(,#*!+*,,!##) (56,523-55,460)(2) = 0.000064ppmMg