Worldwide Solutions - February 2008 - (Page 5) GERSTEL Solutions Worldwide Application Methanol Pentane Ethanol Diethyl-Ether Acetone 2-Propanol Acetonitrile Dichloromethane t-Butanol Hexane n-Propanol Ethylacetate Chloroform Cyclohexane Benzene n-Butanol 1,4-Dioxane 4-Methyl-2-Pentanone Toluene n-Butylacetate Retention time (min) Mean SD RSD (%) 0.888 0.0005 0.055 1.054 0.0005 0.051 1.085 0.0000 0.000 1.110 0.0000 0.000 1.180 0.0004 0.032 1.213 0.0004 0.031 1.246 0.0004 0.030 1.284 0.0005 0.038 1.303 0.0000 0.000 1.402 0.0005 0.038 1.444 0.0004 0.026 1.549 0.0000 0.000 0.0004 0.024 1.603 1.661 0.0005 0.029 1.713 0.0000 0.000 1.785 0.0007 0.039 1.874 0.0005 0.026 1.985 0.0004 0.019 2.028 0.0000 0.000 2.130 0.0004 0.018 Area RSD (%) 2.85 0.77 3.90 1.25 2.28 4.93 3.30 3.50 5.18 1.47 4.68 2.93 3.81 1.71 2.73 5.41 7.70 8.21 3.10 7.03 LOD % (w/w) 0.0060 0.0001 0.0041 0.0002 0.0005 0.0036 0.0028 0.0022 0.0028 0.0002 0.0082 0.0016 0.0110 0.0003 0.0007 0.0237 0.0033 0.0031 0.0014 0.0044 Correlation r2 0.9960 0.9993 0.9976 0.9998 0.9948 0.9991 0.9994 0.9984 0.9980 0.9999 0.9990 0.9995 0.9997 0.9993 0.9998 0.9972 0.9904 0.9985 0.9995 0.9974 List of solvents with retention times (min), standard deviations and relative standard deviations (%) of the retention times. Additionally, relative standard deviations are listed for the peak areas obtained using a System Suitability Test mix (6 µg/mL test mix in DMAC, n=6, RSD% for the raw peak areas). Limits of Detection (% w/w) are listed based on S/N=3 in addition to the linearity achieved (r²) for a three point calibration curve spanning concentrations 6, 25 and 100 µg/mL. Separation of a 20 component solvent mixture in 2.7 minutes – including high-boiling solvent DMAC. Using MACH’s unique cooling ability, the cycle time could be reduced to 4 minutes. GERSTEL MultiPurpose Sampler (MPS) with integrated weighing option Standard autosampler vials are placed in the balance by the MPS. Liquid samples, standards, reagents or diluents that are added are weighed and the weights registered separately. For each sample, multiple liquid additions can be defined by mouse-click in the MAESTRO software. Results are automatically transferred to pre-defined Microsoft Excel tables for convenient processing. Each sample is reported in a separate line, each addition in a separate column. When the sample preparation steps have been finalized, the MPS can introduce the prepared sample to the GC or LC system. Every step from sample preparation to sample introduction is conveniently and efficiently set up in the MAESTRO software. When combined with the Agilent ChemStation software, one integrated method and one integrated sequence table controls everything from sample prep to sample introduction and GC/MS or LC/MS analysis. The MPS weighing option simplifies the laboratory work flow as well as the data handling process, reducing the risk of operator error for improved convenience, productivity and certainty. Enlarged view: Separation of a 20 component solvent mixture GERSTEL Solutions Worldwide – February 2008 5
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