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gc-ms detector

gc-ms detector, Total:133 items.

In the international standard classification, gc-ms detector involves: Wastes, Soil quality. Pedology, Products of the chemical industry, Edible oils and fats. Oilseeds, Water quality, Analytical chemistry, General methods of tests and analysis for food products, Tea. Coffee. Cocoa, Non-textile floor coverings, Animal feeding stuffs, Air quality, Farming and forestry.

Association Francaise de Normalisation, gc-ms detector

NF X31-118*NF ISO 23646:2022 Soil quality - Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
NF X31-034*NF EN 17322:2020 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography-mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
XP T90-145*XP ISO/TS 28581:2012 Water quality - Determination of selected non-polar substances - Method using gas chromatography with mass spectrometric detection (GC-MS)
FD V03-159*FD CEN/TR 16699:2015 Foodstuffs - Determination of pesticide residues by GC-MS/MS - Tandem mass spectrometric parameters
FD CEN/TR 16699:2015 Produits alimentaires - Détermination des résidus de pesticides par CG-SM/SM - Paramètres pour la spectrométrie de masse en tandem
NF ISO 23646:2022 Qualité du sol - Détermination des pesticides organochlorés par chromatographie en phase gazeuse avec détection sélective de masse (CG-SM) et chromatographie en phase gazeuse avec détection par capture d'électrons (GC-ECD)
FD V03-157*FD CEN/TR 16468:2013 Food analysis - Determination of pesticide residues by GC-MS - Retention times, mass spectrometric parameters and detector response information
FD CEN/TR 16468:2013 Analyse des produits alimentaires - Détermination des résidus de pesticides par CG-SM - Temps de rétention, paramètres de spectrométrie de masse et information sur la réponse des détecteurs
NF ISO 18287:2006 Qualité du sol - Dosage des hydrocarbures aromatiques polycycliques (HAP) - Méthode par chromatographie en phase gazeuse avec détection par spectrométrie de masse (CG-SM)
NF V03-089*NF EN 14573:2005 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS
NF X31-170*NF ISO 18287:2006 Soil quality - Determination of polycyclic aromatic hydrocarbons (PAH) - Gas chromatographic method with mass spectrometric detection (CG-MS).
NF EN 17322:2020 Matrices solides environnementales - Dosage des polychlorobiphényles (PCB) par chromatographie en phase gazeuse-spectrométrie de masse (CG-SM) ou chromatographie en phase gazeuse avec détection par capture d'électrons (CG-ECD)
NF EN ISO 15303:2009 Corps gras d'origines animale et végétale - Détection et identification d'un contaminant organique volatil par CPG/SM
NF EN 14573:2005 Produits alimentaires - Dosage du 3-monochloropropane-1,2-diol par CPG/SM
NF EN ISO 18862:2019 Café et dérivés du café - Dosage de l'acrylamide - Méthodes par CLHP-SM/SM et CG-SM après dérivation
NF X31-032:2012 Sludge, treated biowaste and soil - Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD).
NF T90-091*NF ISO 28540:2011 Water quality - Determination of 16 polycyclic aromatic hydrocarbons (PAH) in water - Method using gas chromatography with mass spectrometric detection (GC-MS).
NF T90-182*NF EN ISO 23631:2006 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GCD-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization
NF T60-260*NF EN ISO 15303:2009 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS
NF V18-141*NF EN 15741:2020 Animal feeding stuffs : Methods of sampling and analysis - Determination of OCPs and PCBs by GC-MS

Professional Standard - Agriculture, gc-ms detector

JAP-178 GC-MS method for simultaneous detection of pesticides, etc. (agricultural products)
JAP-181 GC-MS method for simultaneous detection of pesticides, etc. (livestock, aquatic products)
NY/QY 421-2003 Detection of Clenbuterol Hydrochloride (Clenbuterol) Residues in Animal Urine-Gas Chromatography/Mass Spectrometry (GC/MS) Method

Danish Standards Foundation, gc-ms detector

DS/CEN/TS 16190:2012 Sludge, treated biowaste and soil - Determination of dioxins and furans and dioxin-like polychlorinated biphenyls by gas chromatography with high resolution mass selective detection (HR GC-MS)
DS/ISO/TS 28581:2012 Water quality - Determination of selected non-polar substances - Method using gas chromatography with mass spectrometric detection (GC-MS)
DS/CEN/TR 16468:2013 Food analysis - Determination of pesticide residues by GC-MS - Retention times, mass spectrometric parameters and detector response information
DS/EN ISO 15303:2009 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS
DS/ISO 18287:2007 Soil quality - Determination of polycyclic aromatic hydrocarbons (PAH) - Gas chromatographic method with mass spectrometric detection (GC-MS)
DS/ISO 28540:2011 Water quality - Determination of 16 polycyclic aromatic hydrocarbons (PAH) in water - Method using gas chromatography with mass spectrometric detection (GC-MS)
DS/EN 14573:2004 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS
DS/EN 15741:2009 Animal feeding stuffs - Determination of OC-pesticides and PCB's by GC/MS
DS/EN 16167:2012 Sludge, treated biowaste and soil - Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
DS/EN ISO 23631/AC:2007 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization
DS/EN ISO 23631:2006 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization

German Institute for Standardization, gc-ms detector

DIN EN 16190:2019 Soil, treated biowaste and sludge - Determination of dioxins and furans and dioxin-like polychlorinated biphenyls by gas chromatography with high resolution mass selective detection (HR GC-MS)
DIN EN 17322:2021-03 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD); German version EN 17322:2020
DIN EN 17322:2021 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD); German version EN 17322:2020
DIN EN ISO 15303:2009-02 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS (ISO 15303:2001); German version EN ISO 15303:2008
DIN ISO 23646:2023-03 Soil quality - Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD) (ISO 23646:2022); Text in German and English / Note: Date of issue 202...
DIN ISO 23646:2023-09 Soil quality - Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD) (ISO 23646:2022)
DIN EN 14573:2005 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS; German version EN 14573:2004
DIN ISO 18287:2006 Soil quality - Determination of polycyclic aromatic hydrocarbons (PAH) - Gas chromatographic method with mass spectrometric detection (GC-MS) (ISO 18287:2006) English version of DIN ISO 18287:2006-05
DIN EN 14573:2005-01 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS; German version EN 14573:2004
DIN CEN/TS 17743:2022-10 Foodstuff - Determination of pesticide residues by ethyl acetate extraction using GC- and LC-MS/MS (SweEt); German version CEN/TS 17743:2022
DIN ISO 23646:2023 Soil quality - Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD) (ISO 23646:2022); Text in German and English
DIN CEN/TR 16699:2014-11*DIN SPEC 10669:2014-11 Foodstuffs - Determination of pesticide residues by GC-MS/MS - Tandem mass spectrometric parameters; German version CEN/TR 16699:2014
DIN EN ISO 23631:2006 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization (ISO 23631:2006); English version of DIN EN IS
DIN EN ISO 18862:2019 Coffee and coffee products - Determination of acrylamide - Methods using HPLC-MS/MS and GC-MS after derivatization (ISO 18862:2016)
DIN EN ISO 18862:2019-12 Coffee and coffee products - Determination of acrylamide - Methods using HPLC-MS/MS and GC-MS after derivatization (ISO 18862:2016); German version EN ISO 18862:2019
DIN ISO 28540:2014-05 Water quality - Determination of 16 polycyclic aromatic hydrocarbons (PAH) in water - Method using gas chromatography with mass spectrometric detection (GC-MS) (ISO 28540:2011)
DIN EN ISO 23631 Berichtigung 1:2007 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization (ISO 23631:2006); German version EN ISO 23631:
DIN EN 15741:2020 Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs and PCBs by GC-MS
DIN EN 15741:2020-05 Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs and PCBs by GC-MS; German version EN 15741:2020

PL-PKN, gc-ms detector

PN-EN 17322-2021-01 E Environmental Solid Matrices -- Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD)

International Organization for Standardization (ISO), gc-ms detector

ISO/DIS 18475 Environmental solid matrices — Determination of polychlorinated biphenyls (PCB) by gas chromatography — Mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
ISO/PRF 18475:2023 Environmental solid matrices — Determination of polychlorinated biphenyls (PCB) by gas chromatography — Mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
ISO 18475:2023 Environmental solid matrices — Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
ISO/TR 18818:2017 Cosmetics - Analytical method - Detection and quantitative determination of Diethanolamine (DEA) by GC/MS
ISO 15303:2001 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS
ISO 23646:2022 Soil quality — Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
ISO 18862:2016 Coffee and coffee products - Determination of acrylamide - Methods using HPLC-MS/MS and GC-MS after derivatization
ISO 18287:2006 Soil quality - Determination of polycyclic aromatic hydrocarbons (PAH) - Gas chromatographic method with mass spectrometric detection (GC-MS)
ISO/CD 18862:2023 Coffee and coffee products — Determination of acrylamide — Methods using HPLC-MS/MS and GC-MS after derivatization
ISO/TS 28581:2012 Water quality - Determination of selected non-polar substances - Method using gas chromatography with mass spectrometric detection (GC-MS)
ISO/TS 16780:2015 Water quality - Determination of polychlorinated naphthalenes (PCN) - Method using gas chromatography (GC) and mass spectrometry (MS)
ISO 23631:2006 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization
ISO 18363-4:2021 Animal and vegetable fats and oils — Determination of fatty-acid-bound chloropropanediols (MCPDs) and glycidol by GC/MS — Part 4: Method using fast alkaline transesterification and measurement for 2-M
ISO 13913:2014 Soil quality - Determination of selected phthalates using capillary gas chromatography with mass spectrometric detection (GC/MS)

British Standards Institution (BSI), gc-ms detector

BS EN 17322:2020 Environmental Solid Matrices. Determination of polychlorinated biphenyls (PCB) by gas chromatography. mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
BS ISO 18475:2023 Environmental solid matrices. Determination of polychlorinated biphenyls (PCB) by gas chromatography. mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
PD ISO/TR 18818:2017 Cosmetics. Analytical method. Detection and quantitative determination of Diethanolamine (DEA) by GC/MS
BS ISO 23646:2022 Soil quality. Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
22/30456559 DC BS ISO 18475. Environmental solid matrices. Determination of polychlorinated biphenyls (PCB) by gas chromatography. Mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
18/30382049 DC BS EN 17322. Environmental Solid Matrices. Determination of polychlorinated biphenyls (PCB) by gas chromatography-mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
12/30231385 DC BS ISO 13876. Soil quality. Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
20/30415503 DC BS ISO 23646. Soil quality. Determination of organochlorine pesticides by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
BS ISO 18862:2016 Coffee and coffee products. Determination of acrylamide. Methods using HPLC-MS/MS and GC-MS after derivatization
16/30337114 DC BS EN 16987. Foodstuffs. Determination of acrylamide in coffee and coffee products by HPLC-MS/MS and GC-MS
BS EN 14573:2004 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS
BS EN ISO 18862:2019 Coffee and coffee products. Determination of acrylamide. Methods using HPLC-MS/MS and GC-MS after derivatization
PD CEN/TS 17743:2022 Foodstuff. Determination of pesticide residues by ethyl acetate extraction using GC- and LC-MS/MS (SweEt)
BS ISO 28540:2011 Water quality. Determination of 16 polycyclic aromatic hydrocarbons (PAH) in water. Method using gas chromatography with mass spectrometric detection (GC-MS)
PD ISO/TS 28581:2012 Water quality. Determination of selected non-polar substances. Method using gas chromatography with mass spectrometric detection (GC-MS)
BS PD ISO/TS 16780:2015 Water quality. Determination of polychlorinated naphthalenes (PCN). Method using gas chromatography (GC) and mass spectrometry (MS)
BS EN ISO 23631:2006 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GCMS detection) after liquid-liquid extraction and derivatization
BS EN 16167:2012 Sludge, treated biowaste and soil. Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
BS EN ISO 18363-4:2021 Animal and vegetable fats and oils. Determination of fatty-acid-bound chloropropanediols (MCPDs) and glycidol by GC/MS. Method using fast alkaline transesterification and measurement for 2-MCPD, 3-MCPD and glycidol by GC-MS/MS

ES-UNE, gc-ms detector

UNE-EN 17322:2020 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD) (Endorsed by Asociación Española de Normalización in September of 2020.)
UNE-EN 14573:2005 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS
UNE-EN ISO 18862:2020 Coffee and coffee products - Determination of acrylamide - Methods using HPLC-MS/MS and GC-MS after derivatization (ISO 18862:2016)
UNE-CEN/TS 17743:2022 Foodstuff - Determination of pesticide residues by ethyl acetate extraction using GC- and LC-MS/MS (SweEt) (Endorsed by Asociación Española de Normalización in May of 2022.)
UNE-EN 15741:2020 Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs and PCBs by GC-MS
UNE-EN ISO 23631:2007/AC:2008 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization (ISO 23631:2006)

CH-SNV, gc-ms detector

SN EN 17322-2020 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD)

IT-UNI, gc-ms detector

UNI EN 17322-2020 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
EC 2-2021 UNI EN 15741-2021 Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs and PCBs by GC-MS

CEN - European Committee for Standardization, gc-ms detector

PREN 17322-2018 Environmental Solid Matrices - Determination of polychlorinated biphenyls (PCB) by gas chromatography - mass selective detection (GC-MS) or electron-capture detection (GC-ECD)
PREN 16987-2016 Foodstuffs - Determination of acrylamide in coffee and coffee products by HPLC-MS/MS and GC-MS
EN 15741:2009 Animal feeding stuffs - Determination of OC-pesticides and PCB's by GC/MS
PREN 15741-2018 Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs and PCBs by GC/MS

Korean Agency for Technology and Standards (KATS), gc-ms detector

KS H ISO 15303:2008 Animal and vegetable fats and oils-Detection and identification of a volatile organic contaminant by GC/MS
KS I ISO 18287:2018 Soil quality — Determination of polycyclic aromatic hydrocarbons(PAH) — Gas chromatographic method with mass spectrometric detection(GC-MS)
KS M 1079-2016(2021) Determination of PCNs and PCTs in polymer by GC/MS
KS M 1079-2016 Determination of PCNs and PCTs in polymer by GC/MS
KS H ISO 15303-2008(2018) Animal and vegetable fats and oils－Detection and identification of a volatile organic contaminant by GC/MS
KS I ISO 18287:2007 Soil quality－Determination of polycyclic aromatic hydrocarbons(PAH)－ Gas chromatographic method with mass spectrometric detection(GC－MS)
KS M 6905-2021 Leather — Determination of the perfluorinated compounds(PFCs) by gas chromatography-tandem mass spectrometry(GC-MS/MS) and liquid chromatography-tandem mass spectrometry(LC-MS/MS)
KS I ISO 23631:2018 Water quality — Determination of dalapon, trichloroacetic acid and selected haloacetic acids — Method using gas chromatography(GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivat
KS M 1075-2008(2018) Determination of organotin compounds(MBT, DBT, TBT) in ceramic powder－GC/MS method

KR-KS, gc-ms detector

KS I ISO 18287-2018 Soil quality — Determination of polycyclic aromatic hydrocarbons(PAH) — Gas chromatographic method with mass spectrometric detection(GC-MS)
KS I ISO 23631-2018 Water quality — Determination of dalapon, trichloroacetic acid and selected haloacetic acids — Method using gas chromatography(GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivat
KS M 1075-2008(2023) Determination of organotin compounds(MBT, DBT, TBT) in ceramic powder－GC/MS method

European Committee for Standardization (CEN), gc-ms detector

CEN/TR 16468:2013 Food analysis - Determination of pesticide residues by GC-MS - Retention times, mass spectrometric parameters and detector response information
CEN/TR 16699:2014 Foodstuffs - Determination of pesticide residues by GC-MS/MS - Tandem mass spectrometric parameters
EN ISO 18862:2019 Coffee and coffee products - Determination of acrylamide - Methods using HPLC-MS/MS and GC-MS after derivatization (ISO 18862:2016)
EN 14573:2004 Foodstuffs - Determination of 3-monochlorpropane-1,2-diol by GC/MS
FprCEN/TS 17743-2021 Foodstuff - Determination of pesticide residues by ethyl acetate extraction using GC- and LC-MS/MS (SweEt)
EN 16167:2012 Sludge, treated biowaste and soil - Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
EN 16167:2018 Soil@ treated biowaste and sludge - Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GCECD)
EN ISO 18363-4:2021 Animal and vegetable fats and oils - Determination of fatty-acid-bound chloropropanediols (MCPDs) and glycidol by GC/MS - Part 4: Method using fast alkaline transesterification and measurement for 2-MCPD, 3-MCPD and glycidol by GC-MS/MS (ISO 18363-4:2021)
EN ISO 23631:2006/AC:2007 Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatization (ISO 23631:2006)

VN-TCVN, gc-ms detector

TCVN 7731-2008 Foodstuffs.Determination of 3-Monochloropropane-1,2-diol by GC/MS

Lithuanian Standards Office , gc-ms detector

LST EN 14573-2004 Foodstuffs - Determination of 3-monochloropropane-1,2-diol by GC/MS
LST EN ISO 15303:2009 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS (ISO 15303:2001)
LST EN 16167-2012 Sludge, treated biowaste and soil - Determination of polychlorinated biphenyls (PCB) by gas chromatography with mass selective detection (GC-MS) and gas chromatography with electron-capture detection (GC-ECD)
LST EN 15741-2009 Animal feeding stuffs - Determination of OC-pesticides and PCB?s by GC/MS

AENOR, gc-ms detector

UNE-EN ISO 15303:2009 Animal and vegetable fats and oils - Detection and identification of a volatile organic contaminant by GC/MS (ISO 15303:2001)
UNE-EN 15741:2009 Animal feeding stuffs - Determination of OC-pesticides and PCB's by GC/MS

Association of German Mechanical Engineers, gc-ms detector

VDI 4301 Blatt 6-2012 Measurement of indoor air pollution - Measurement of phthalates with GC/MS

Professional Standard - Commodity Inspection, gc-ms detector

SN/T 3621-2013 Determination of tris (2-chloroethyl) phosphate in toy materials.Gas chromatography-Mass spectrography
SN/T 3620-2013 Determination of diisobutyl phthalate in toy materials.Gas chromatography-mass spectrometry

Tianjin Provincial Standard of the People's Republic of China, gc-ms detector

DB12/T 426-2010 Determination method of 205 kinds of pesticide residues in vegetables and fruits-GC/MS method

未注明发布机构, gc-ms detector

BS EN ISO 23631:2006(2007) Water quality — Determination of dalapon, trichloroaceticacidand selected haloacetic acids — Method using gas chromatography (GC - ECD and / or GC - MS detection) after liquid - liquid extraction and derivatization