Save Trace Element Statistics
This menu will export statistical data especially useful for trace element analyses. Only a single line is output for each sample. The format is as follows:
SAMPLE Sample name (in double quotes)
TOTAL Total weight percent (average for sample)
ONTIM Actual on peak count time (average for element)
HITIM Actual high off peak count time (average for element)
LOTIM Actual low off peak count time (average for element)
DETIM Deadtime in micro-seconds
BEAMCUR Faraday or beam current reading in nano-amps (average)
El AVG WT% Elemental weight percent averages
El SDEV Elemental weight percent standard deviations
El SERR Elemental weight percent standard errors
El RELDEV Elemental relative deviations (stddev / average)
El MIN Elemental weight percent minimums
El MAX Elemental weight percent maximums
El CDL99 (Pred.) Elemental weight percent detection limits (3 sigma prediction)
El CDL99 Elemental weight percent detection limits (average 3 sigma)
El CDL99 (PPM) Elemental PPM detection limits (average 3 sigma)
El %ERR Elemental analytical error in relative percent (one sigma)
El CDL(60ci) Elemental t-test detection limit (60 percent confidence)
El CDL(80ci) Elemental t-test detection limit (80 percent confidence)
El CDL(90ci) Elemental t-test detection limit (90 percent confidence)
El CDL(95ci) Elemental t-test detection limit (95 percent confidence)
El CDL(99ci) Elemental t-test detection limit (99 percent confidence)
El SEN(60ci) Elemental t-test analytical sensitivity (for major elements)
El SEN(80ci) Elemental t-test analytical sensitivity (for major elements)
El SEN(90ci) Elemental t-test analytical sensitivity (for major elements)
El SEN(95ci) Elemental t-test analytical sensitivity (for major elements)
El SEN(99ci) Elemental t-test analytical sensitivity (for major elements)
The expression used for the predicted detection limits utilizes both the statistics from the peak and background:
where:
is the
intensity of the background in cps/nA (divide the unknown counts by beam
current)
is the count
time used for the unknown background or peak measurement (must be equal)
is the beam
current used for the unknown measurement in nA
is the
concentration of the element in the standard in weight percent (wt. %)
is the
intensity of the standard in cps/nA (divide the standard intensity by standard
beam current)
is the unknown
concentration in weight percent (wt. %)