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Included among these are a number of protocols for the performance of regulatory methods.   [![Sample Preparation](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/spme-desorption.jpg "Sample Preparation")](https://www.sigmaaldrich.com/applications/analytical-chemistry/sample-preparation) [Sample Preparation](https://www.sigmaaldrich.com/applications/analytical-chemistry/sample-preparation) [![Gas Chromatography (GC)](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/gc-columns-green-background-400-248.jpg "Capillary Gas Chromatography Column")](https://www.sigmaaldrich.com/applications/analytical-chemistry/gas-chromatography) [Gas Chromatography (GC)](https://www.sigmaaldrich.com/applications/analytical-chemistry/gas-chromatography) [![Liquid Chromatography](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/hplc-chromatogram.jpg "Liquid Chromatography")](https://www.sigmaaldrich.com/applications/analytical-chemistry/liquid-chromatography) [Liquid Chromatography](https://www.sigmaaldrich.com/applications/analytical-chemistry/liquid-chromatography) [![Photometry and Reflectometry](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/photometry-and-reflectometry-290x180.jpg "Photometry and Reflectometry")](https://www.sigmaaldrich.com/applications/analytical-chemistry/photometry-and-reflectometry) [Photometry and Reflectometry](https://www.sigmaaldrich.com/applications/analytical-chemistry/photometry-and-reflectometry) [![Mass Spectometry](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/290x180-mass-spectrum-man-3-glycan.jpg "Mass Spectometry")](https://www.sigmaaldrich.com/applications/analytical-chemistry/mass-spectrometry) [Mass Spectometry](https://www.sigmaaldrich.com/applications/analytical-chemistry/mass-spectrometry) [![Nuclear Magnetic Resonance (NMR)](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/290x180-nuclear-magnetic-resonance-diagram.jpg "Nuclear Magnetic Resonance (NMR)")](https://www.sigmaaldrich.com/applications/analytical-chemistry/nuclear-magnetic-resonance) [Nuclear Magnetic Resonance (NMR)](https://www.sigmaaldrich.com/applications/analytical-chemistry/nuclear-magnetic-resonance) [![Atomic Spectroscopy](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/290x180-atomic-absorption-spectrometer.jpg "Atomic Spectroscopy")](https://www.sigmaaldrich.com/applications/analytical-chemistry/atomic-spectroscopy) [Atomic Spectroscopy](https://www.sigmaaldrich.com/applications/analytical-chemistry/atomic-spectroscopy) [![Thin Layer Chromatography (TLC)](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/categories/290x180/tlc-plates.jpg "Thin Layer Chromatography (TLC)")](https://www.sigmaaldrich.com/applications/analytical-chemistry/thin-layer-chromatography) [Thin Layer Chromatography (TLC)](https://www.sigmaaldrich.com/applications/analytical-chemistry/thin-layer-chromatography) [![Wet Chemical Analysis](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/290x180-glassware-containing-colored-solutions.jpg "Wet Chemical Analysis")](https://www.sigmaaldrich.com/applications/analytical-chemistry/wet-chemical-analysis) [Wet Chemical Analysis](https://www.sigmaaldrich.com/applications/analytical-chemistry/wet-chemical-analysis) [![Calibration, Qualification & Validation](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/applications/analytical-chemistry/certified-reference-materials-card.jpg "Calibration, Qualification & Validation")](https://www.sigmaaldrich.com/applications/analytical-chemistry/calibration-qualification-and-validation) [Calibration, Qualification & Validation](https://www.sigmaaldrich.com/applications/analytical-chemistry/calibration-qualification-and-validation) [![Titration and Karl Fischer Titration](https://www.sigmaaldrich.com/content/dam/cms-commons/sigmaaldrich/marketing/global/images/categories/analytical-reagents/karl-fischer-titration-mcp.jpg "Titration and Karl Fischer Titration")](https://www.sigmaaldrich.com/applications/analytical-chemistry/titration-and-karl-fischer) [Titration and Karl Fischer Titration](https://www.sigmaaldrich.com/applications/analytical-chemistry/titration-and-karl-fischer) Top __Sign In To Continue__ To continue reading please sign in or create an account. 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