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In table 3 it is shown that the IDL’s for both systems are lower than 1 fg for EI source SQ’s. The other method using three times the noise as a calculation for the IDL shows significant lower results than the other method.
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The Average IDL of the two systems is 28.3 fg, this means that a concentration equal or greater than 28.3 is detectable with a 99% probability.
#Idl design usa full#
This gives an IDL of (2.9978*384)/ (200*9235)= 24.9 fg.įigure 2: EI full scan extracted ion chromatogram of m/z 272 from 200 fg OFNįigure 3: Peak area response for eight measurements of 200 fg OFN from system 1. System 2 has a mean value of 9235 with a STD of 384. When looking in the t-table it shows a value of 2.9978 (n=7, 99% confidence).įor the eight 200 fg measurements of system 1 the mean value of the area is 8647 with a STD of 455.
#Idl design usa series#
Resultsįor the first IDL calculation method a series of eight injections was used. Table 2: Analytical conditions Scion SQ GC-MS. Table 1: Analytical conditions 8×00-GC analyser The IDL value will be determined on multiple SQ-MS systems.
#Idl design usa pro#
The Scion 8500-GC analyser used for the determination of the IDL was equipped with an 8400 pro autosampler.įor all experiments 200 fg/µl OFN in iso-octane was used. The SQ-MS can be implemented on both the 8300-GC as well as on the 8500-GC platform. To simplify the LOD is method specific while the IDL is practically a set test for sensitivity. It is often determined on the basis of three times the noise level. It can be used for qualitative analysis, but not for quantitative analysis. The LOD is the smallest quantity of analyte that is significantly different from the blank. The IDL is a concept derived from the limit of detection (LOD) but these terms should not be confused. SNR is a measure of the IDL using the root mean square (RMS) which is the standard deviation of the noise. The calculation can be done using the one sided student t-distribution when number of the measurements is below 30.Īnother method uses the signal to noise ratio (SNR). One of the methods uses the relation between the standard deviation (STD) of the measured area and the statistical confidence factor t.
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The IDL can be calculated using different methods. The instrument detection limit (IDL) of the mass Spectrometer (MS), is defined as the lowest concentration (of an analyte) that can be statistically distinguished from the noise level. The exceptional design of this device results in high sensitivity and this results in a low IDL.įigure 1 shows the SCION 83 GC with 8700 SQ-MS in combination with the 8400 pro autosampler.įigure 1: SCION Instruments 83 GC with 8700 SQ-MS and a 8400 pro autosampler. In addition, the heated optics and an Extended Dynamic Range (EDR) detector enable the SCION SQ to deliver accurate quantification and identification.
#Idl design usa free#
The design is lens free to reduce the loss of ions and increase detector sensitivity. The SCION Instruments Single Quad (SQ) GC-MS is known for its exceptional performance, the SQ models are capable of handling a wide variety of GC-MS SQ applications.