gas chromatography air action

gas chromatography air action, Total:200 items.

The international standard classification for "gas chromatography air action" includes: Protection against crime , Ambient atmospheres , Other standards related to optics and optical measurements , Workplace atmospheres , Tobacco, tobacco products and related equipment , Chemical technology (Vocabularies) , Chemical analysis , Equipment for the chemical industry , Occupational safety. Industrial hygiene , Power stations in general .

The Chinese standard classification for "gas chromatography air action" includes: Labor sanitation , Crime judging technology , Analysis methods for toxic substances in atmosphere , chromatograph , Tobacco curing in general , Basic standards and general methods , Legal medical expert , Electric power testing technique .

Professional Standard - Hygiene

WS/T 136-1999 Workplace air. Determination of isopropyl ether. Thermal desorption gas chromatographic method
WS/T 154-1999 Workplace air. Determination of 1, 2-dichloroethane. Passive sampling gas chromatographic method
WS/T 169-1999 Workplace air ―Determination of nheptance―Gas chromatographic method
WS/T 157-1999 Workplace air. Determination of chlorobenzene. Charcoal diffusive sampler, solvent desorption and gas chromatographic method
WS/T 138-1999 Workplace air. Determination of 1, 2-ethylene dichloride. Solvent desorption gas chromatographic method
WS/T 139-1999 Workplace air. Determination of methyl-iso-butyl ketone. Solvent desorption gas chromatographic method
WS/T 171-1999 Workplace air. Determination of anthracene and phenathrene. High performance liquid chromatographic method
WS/T 173-1999 Workplace air. Determination of carbon monoxide. Gas chromatographic method
WS/T 160-1999 Workplace air. Determination of furfuryl alcohol. Gas chromatographic method
WS/T 173-99 Gas chromatography method for determination of carbon monoxide in workplace air
WS/T 142-1999 Workplace air. Determination aniline. Solvent desorption gas chromatographic method
WS/T 155-1999 Workplace air - Determination of acetic ether - Passive sampling gas chromatographic method
WS/T 137-1999 Workplace air. Determination of chlorobenzene. Solvent desorption gas chromatographic method
WS/T 143-1999 Workplace air. Determination of methanol. Solvent desorption gas chromatographic method
WS/T 164-1999 Workplace air - Determination of n-butylamine - Solvent desorption gas chromatographic method
WS/T 135-1999 Workplace air. Determination of isobutanal. Thermal desorption gas chromatographic method
WS/T 161-1999 Workplace air. Determination of butyl acrylate. Gas chromatographic method
WS/T 151-1999 Workplace air. Determination of benzene. Passive samping gas chromatographic method
WS/T 152-1999 Workplace air. Determination of toluene. Passive sampling gas chromatographic method
WS/T 167-1999 Workplace air. Determination of diketen. Thermal desorption gas chromatographic method
WS/T 153-1999 Workplace air. Determination of dimethyl benzene. Passive sampling gas chromatographic method
WS/T 144-1999 Workplace air. Determination of trichloroethylene. Passive sampler gas chromatographic method
WS/T 159-1999 Workplace air. Determination of trichloroaniline. Gas chromatographic method
WS/T 156-1999 Workplace air. Determination of tetrachloroethylene. Passive sampling gas chromatographic method
WS/T 133-1999 Workpalce air —Determination of fenthion-solvement desorption gas chromatographic method
WS/T 158-1999 Workplace air. Determination of 1, 4-butyrolactone. Solvent desorption gas chromatographic method
WS/T 146-1999 Workplace air. Determination of cypermethrin. High-performance liquid chromatography method
WS/T 172-1999 Workplace air. Determination of decaline and tetraline. Gas chromatographic method
WS/T 141-1999 Workplace air. Determination of total hydrocarbon except for methane. Gas chromatographic method
WS/T 165-1999 Workplace air. Determination of iso-octanol. Gas chromatographic method
WS/T 145-1999 Workplace air. Determination of β-naphthol. High-performance liquid chromatography method
WS/T 134-1999 Workplace air —Determination of biphenye-phenyl ether —Solvent desorption gas chromatographic method
WS/T 140-1999 Workplace air. Determination of methylisobutylketone. Desorption with heating gas chromatographic method

Inner Mongolia Provincial Standard of the People's Republic of China

DB15/T 1427-2018 Determination of Dimethyl Sulfate in Workplace Air by Gas Chromatography-Mass Spectrometry

Professional Standard - Public Safety Standards

GA/T 1327-2016 GC, GC-MS and LC-MS/MS examination methods for zolpidem in biological samples in forensic science
GA/T 2024-2023 Forensic sciences-Examination methods for 5-MeO-DiPT and 5-MeO-MiPT in suspected drugs-GC and GC-MS
GA/T 208-2019 Forensic sciences—Examination methods for phosphide in biological samples—HSGC and HSGC-MS
GA/T 1615-2019 Forensic sciences—Examination methods for clozapine in biological samples—GC and GC-MS
GA/T 1008.2-2013 GC and GC-MS examination methods for drugs—Part 2:Morphine
GA/T 933-2011 GC and GC-MS examination methods for monofluorocetate anion in biological samples
GA/T 1989-2022 Forensic sciences—Examination methods for promethazine in suspected drugs一GC and GC-MS

Group Standards of the People's Republic of China

T/WSJD 18.19-2024 Determination of chemical factors in workplace air - Gas chromatography method for methylene chloride
T/WSJD 18.8-2021 Gas Chromatography for Determination of Tributyl Phosphate in Chemical Factors in Workplace Air
T/WSJD 18.11-2021 Gas Chromatography for the Determination of Dimethylaniline in the Air of the Workplace
T/WSJD 18.6-2021 Gas Chromatography for the Determination of Difluorochloromethane in Chemical Factors in the Air of the Workplace
T/WSJD 18.18-2024 Determination of chemical factors in workplace air Gas chromatography method for 1,4-dioxane
T/WSJD 18.22-2024 Portable gas chromatography-mass spectrometry for determination of bischloromethyl ether in workplace air
T/WSJD 18.9-2021 Gas Chromatography for the Determination of Methyl Isoamyl Ketone in the Air of the Workplace
T/SDAQI 011-2021 Determination of phthalate esters in solid air freshener Gaschromatography-mass spectrometry method
T/GAIA 014-2022 Determination of alcohols in workplace air—Thermal desorption gas chromatography mass spectrometry method
T/WSJD 18.17-2024 Determination of chemical factors in workplace air - Gas chromatography method for methyl tert-butyl ether
T/WSJD 18.10-2021 Gas Chromatography for the Determination of Methyl Methacrylate by Chemical Factors in the Air of the Workplace
T/WSJD 18.5-2021 High Performance Liquid Chromatography for the Determination of Hydrazine in the Air of the Workplace
T/WSJD 18.21-2024 Determination of chemical factors in workplace air - Gas chromatographic method for n-butylmercaptan

Professional Standard - Environmental Protection

HJ 739-2015 Ambient air - Determination of nitroaromatics - Gaschromatography mass spectrometry
HJ 852-2017 Ambient air - Determination of indicative toxaphene - Gas chromatography mass spectrometry
HJ 900-2017 Ambient air - Determination of organochlorine pesticides - Gas chromatography/mass spectrometry method
HJ 1072-2019 Water quality—Determination of pyridine—Headspace / gas chromatography
HJ 901-2017 Ambient air - Determination of organochlorine pesticides - Gas chromatography
HJ 902-2017 Ambient air - Determination of polychlorinated biphenyls - Gas chromatography/mass spectrometry method
HJ 604-2011 Ambient air-Determination of total hydrocarbons-Gas chromatographic method
HJ 867-2017 Ambient air - Determination of phthalate esters - Gas chromatography/mass spectrometry
HJ 1042-2019 Ambient air and waste gas—Determination of trimethylamine—Solvent absorption-Headspace/gas chromatography
HJ 646-2013 Ambient air and stationary source emissions - Determination of gas and particle-phase polycyclic aromatic hydrocarbons with gas chromatography/mass spectrometry
HJ 959-2018 Water quality - Determination of tetraethyl lead - Headspace /gas chromatography-mass spectrometry
HJ 903-2017 Ambient air - Determination of polychlorinated biphenyls - Gas chromatography
HJ 1219-2021 Ambient air and waste gas—Determination of pyridine —Gas chromatography method

National Metrological Technical Specifications of the People's Republic of China

JJF 1164-2018 Calibration Specification for Gas Chromatography-Mass Spectrometries
JJF(建材) 203-2023 Specification for calibration of micro gas chromatographic columns for portable gas chromatographs

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 17070-1997 Workplace air--Determination of benzyl chloride--Gas chromatographic method
GB/T 16110-1995 Workplace air--Determination of phosphorus--Gas chromatographic method
GB/T 4946-1985 Terms of gas chromatography
GB/T 17069-1997 Workplace air--Determination of propionic acid--Gas chromatographic method
GB/T 16045-1995 Workplace air--Determination of benzene--Thermal desorption gas chromatographic method
GB/T 39874-2021 Examination methods for bromazepam in suspected drugs—Gas chromatography and gas chromatography-mass spectrometry
GB/T 17066-1997 Workplace air--Determination of diethylamine--Gas chromatographic method
GB/T 16093-1995 Workplace air--Determination of hexachlorobenzene--Gas chromatographic method
GB/T 15263-1994 Ambient air－Determination of total hydrocarbons－Gas chromatographic method
GB/T 29636-2013 GC ,HPLC and GC-MS examination methods for methylamphetamine in suspected drug
GB/T 39877-2021 Examination methods for diazepam in suspected drugs—Gas chromatography and gas chromatography-mass spectrometry
GB/T 16118-1995 Workplace air--Determination of rogor--Gas chromatographic method
GB/T 39885-2021 Examination methods for triazolam in suspected drugs - Gas chromatography and gas chromatography-mass spectrometry
GB/T 39876-2021 Examination methods for cocaine in suspected drugs—Gas chromatography and gas chromatography-mass spectrometry
GB/T 14670-1993 Air quality－Determination of styrene－Gas chromatography
GB/T 17064-1997 Workplace air--Determination of methyl mercaptan--Gas chromafography method
GB/T 29635-2013 GC and GC-MS examination methods for heroin in suspected drug
GB/T 17068-1997 Workplace air--Determination of formic acid--Gas chromatographic method
GB/T 14676-1993 Air quality －Determination of trimethylamine －Gas chromatography
GB/T 39878-2021 Examination methods for estazolam in suspected drugs - Gas chromatography and gas chromatography-mass spectrometry
GB/T 16092-1995 Workplace air--Determination of DDT--Gas chromatographic method
GB/T 16113-1995 Workplace air--Determination of 2, 4, 6-trinitrotoluene--Gas chromatographic method
GB/T 39875-2021 Examination methods for chlordiazepoxide in suspected drugs—Gas chromatography and gas chromatography-mass spectrometry
GB/T 21135-2007 Tobacco and tobacco products—Determination of vapour-phase nicotine in air—Gas-chromatographic method
GB/T 17090-1997 Workplace air--Determination of trichlorethylene--Gas chromatographic method
GB/T 4946-2008 Terms of gas chromatography
GB/T 39881-2021 Examination methods for methaqualone in suspected drugs -- Gas chromatography and gas chromatography-mass spectrometry
GB/T 16112-1995 Workplace air--Determination of dinitrobenzene--Gas chromatographic method
GB/T 39880-2021 Examination methods for methadone in suspected drugs -- Gas chromatography and gas chromatography-mass spectrometry
GB/T 30430-2019 Standard column used for evaluating gas chromatographs
GB/T 17071-1997 Workplace air--Determination of benzyl cyanide--Gas chromatographic method
GB/T 39883-2021 Examination methods for morphine in suspected drugs - Gas chromatography and gas chromatography-mass spectrometry
GB/T 30430-2013 Standard Column Used for Evaluating Gas Chromatography
GB/T 29637-2013 GC and GC-MS examination methods for ketamine in suspected drug

Professional Standard - Machinery

JB/T 12963-2016 On-line gas chromatograph for VOCs in air
JB 6244-1992 Laboratory gas chromatograph
JB/T 5225-1991 Standard Chromatographic Column for Testing of Gas Chromatograph
JB/T 5227.1-1991 Pipeline accessories for gas chromatograph
JB 5225-1991 Standard chromatographic column for gas chromatograph testing

Professional Standard - Agriculture

159药典三部-2010 Appendix III Chromatography IIIC Gas Chromatography
85药典四部-2015 0521 Gas chromatography
205药典三部-2020 Chromatography 0521 Gas Chromatography
66药典四部-2020 0521 Gas chromatography
186药典三部-2015 Chromatography 0521 General Principles of Gas Chromatography 27

Henan Provincial Standard of the People's Republic of China

DB41/T 1503-2017 Determination of urea in workplace air by high performance liquid chromatography

National Metrological Verification Regulations of the People's Republic of China

JJG 700-2016 Verification Regulation of Gas Chromatograph

Professional Standard - Judicatory

SF/T 0113-2021 Determination of cyanide in blood by gas chromatography-mass spectrometry and gas chromatography

Shandong Provincial Standard of the People's Republic of China

DB37/T 3023.4-2017 Determination of Toxic Substances in Workplace Air - Part 4: Malathion by Gas Chromatography
DB37/T 3993-2020 Determination of benzene residues in edible oil—Headspace-GC/MS method

Chongqing Provincial Standard of the People's Republic of China

DB50/T 835-2017 Determination of Methanol in Water by Headspace Gas Chromatography

Jiangxi Provincial Standard of the People's Republic of China

DB36/T 2105-2024 Determination of Pyridine in Water Quality - Head Space/Gas Chromatography-Mass Spectrometry

Professional Standard - Chemical Industry

HG/T 4095-2009 On-line gas chromatograph for chemical process
HG/T 4095-2023 Online gas chromatograph for chemical industry

Professional Standard - Petroleum

SY 5191-2011 Gas Chromatography Mud Logging Instrument
SY/T 5191-2011 Gas Chromatograph Mud Logging Unit

Professional Standard - Commodity Inspection

SN/T 5112-2019 Determination of propylene glycol in edibe animals and feeds for import and export - GC Method and GC-MS method

National Health Commission of the People's Republic of China

GBZ/T 309-2018 Determination of acetone in urine— Headspace-gas chromatography method

Professional Standard - Nuclear Industry

EJ/T 651-1992 Nickel-63β Radioactive Source for Gas Chromatography

Professional Standard - Energy and Power Planning

DL/T 920-2005 Determination of air and carbon tetrafluoride content in sulphur hexafluoride by gas chromatography method

Liaoning Provincial Standard of the People's Republic of China

DB21/T 2975-2018 Determination of Toxic Substances in Workplace Air by Gas Chromatography-Electron Capture Method

American Society for Testing and Materials (ASTM)

ASTM D1946-90(2006) Standard Practice for Analysis of Reformed Gas by Gas Chromatography
ASTM D1946-90(2015)e1 Standard Practice for Analysis of Reformed Gas by Gas Chromatography
ASTM D1946-90(2011) Standard Practice for Analysis of Reformed Gas by Gas Chromatography
ASTM D6060-96 Standard Practice for Sampling of Process Vents With a Portable Gas Chromatograph
ASTM E260-96(2006) Standard Practice for Packed Column Gas Chromatography
ASTM E260-96(2011) Standard Practice for Packed Column Gas Chromatography

Gosstandart of Russia

GOST 32384-2013 Acetic acid. Gas chromatographic determination in atmospheric air
GOST R 52570-2006 Motor and aviation gasolines. Determination of benzene and toluene by method of gas chromatography
GOST R ISO 16000-33-2020 Indoor air. Part 33. Determination of phthalates with gas chromatography/mass spectrometry (GC/MS)

Bureau of Indian Standards

IS 15210-2002 Workplace Air - Determination of Vinyl Chloride - Charcoal Tube/Gas Chromatographic Method
IS 15211-2002 Workplace Air - Determination of Vaporous Aromatic Hydrocarbons - Charcoal Tube/Solvent Desorption/Gas Chromatographic Method
IS 15207-2002 Workplace Air - Determination of Vaporous Chlorinated Hydrocarbons - Charcol Tube/Solvent Desorption/Gas Chromatographic Method
IS 5182-21-2001 Methods for Measurment of Air Pollution - Part 21 Non Methane Hydrocorbons in Air by Gas Chromotography

Magyar Szabványügyi Testület

MSZ 21456/15-1980 Testing of gaseous air pollutants, gas chromatography

Association Francaise de Normalisation

NF X43-025:1988 Air quality. Ambient air. Determination of polycyclic aromatic hydrocarbons. High pressure liquid chromatography and gaz chromatography determination.
NF X43-264:2011 Air quality - Workplace air - Sampling and determination of aldehydes by pumping on DNPH impregnated substrates and detemination by liquid chromatography.
NF EN 16857:2017 Food products - Determination of benzene content in non-alcoholic beverages, other beverages and vegetable-based infant foods by headspace gas chromatography coupled with spectroscopy

GCC Standardization Organization

GSO ISO 9487:2013 Workplace air - Determination of vaporous aromatic hydrocarbons - Charcoal tube/solvent desorption/gas chromatographic method
GSO ISO 9486:2017 Workplace air -- Determination of vaporous chlorinated hydrocarbons -- Charcoal tube/solvent desorption/gas chromatographic method
OS GSO ASTM D1946:2024 Standard Practice for Analysis of Reformed Gas by Gas Chromatography

British Standards Institution (BSI)

BS ISO 16000-33:2017 Indoor air. Determination of phthalates with gas chromatography/mass spectrometry (GC/MS)
BS ISO 16000-33:2024 Indoor air - Determination of phthalates with gas chromatography/mass spectrometry (GC/MS)
BS 6069-3.1:1989 Characterization of air quality - Workplace atmospheres - Method for the determination of vinyl chloride using a charcoal tube and a gas chromatograph
BS 3282:1963 Glossary of terms relating to gas chromatography
BS 6069-3.1:1990 Characterization of air quality - Workplace atmospheres - Method for the determination of vinyl chloride using a charcoal tube and a gas chromatograph

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ISO 9487:2015 Workplace air - Determination of vaporous aromatic hydrocarbons - Charcoal tube/solvent desorption/gas chromatographic method

Japanese Industrial Standards Committee (JISC)

JIS K 0123:2018 General rules for gas chromatography / mass spectrometry
JSA JIS K 0114-2012 General Rules for Gas Chromatography
JIS K 0123:2006 General rules for gas chromatography/mass spectrometry
JIS K 0114:2012 General rules for gas chromatography

Polski Komitet Normalizacyjny (PKN)

PN Z04528-2021-07 P Air purity protection -- Determination of propane-1,3-sultone in workplaces by gas chromatography-mass spectrometry (GC-MS)
PN Z04182-17-1990 Air purity protection Tests for pesticides Determination of dichlorvos in work places by gas chromatography
PN Z04045-09-1992 Air purity protection ests for content of aldehydes etermination of furfuraldehyde n work places by gas chromatography
PN Z04182-18-1992 Air purity protection Tests for pesticides Determination of fenthion in work places by gas chromatography
PN Z04182-12-1988 Air purity protection Tests for pesticides Determination of diazinon in work places by gas chromatography
PN Z04182-19-1992 Air purity protection Tests for pesticides Determiriation of deltamethrin in work places by gas chromatography
PN Z04182-11-1987 Air purity protection Tests tor pesticides Determination of fenilrothion in work places by gas chromatography
PN Z04182-13-1988 Air. punty protection Tests for pesticides Determination of phosalone in work places by gas chromatography
PN Z04168-02-1986 Air purily protection est for trichlorobenzene etermination of 1, 2, 3- i 1, 2, 4- richlorobenzene in work places y gas chromatography
PN Z04215-02-1991 Air purity protection Tests for chloroacetic acid Determination of chloroacetic acid in work places by gas chromatography
PN Z04176-02-1986 Air purity protection ests for MCPA etermination of MCPA in work laces by gas chromatography
PN Z04227-02-1992 Air purity protection ests for kerosene content etermination of kerosene vapours n work places by gas chromatography
PN Z04213-02-1989 Air purity protection Tests for nitroglycerin Determination of nitroglycerin in work places by gas chromatography
PN Z04078-02-1991 Air purity protection Tests for a-chloroacetophenone Determination of a-chloroacetophenone in work places by gas chromatography

Spanish Association for Standardization (UNE)

UNE 81586:1998 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF ORGANIC VAPORS IN AIR. CHARCOAL TUBE. SOLVENT DESORPTION. GAS CHROMATOGRAPHIC METHOD.
UNE 81598:1997 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF KETONES IN AIR. CHARCOAL TUBE/SOLVENT DESORPTION/GAS CHROMATOGRAPHIC METHOD.
UNE 81598/1M:1998 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF KETONES IN AIR. Charcoal tube/Solvent desorption/Gas chromatographic method.
UNE 81750:1997 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF STYRENE IN AIR. DIFFUSIVE SAMPLING/SOLVENT DESORPTION/GAS CHROMATOGRAPHIC METHOD.
UNE 81750/1M:1998 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF STYRENE IN AIR. Diffusive sampling/Solvent desorption/Gas chromatography method.

Korean Agency for Technology and Standards (KATS)

KS I ISO 9486-2022 Workplace air Determination of vaporous chlorinated hydrocarbons Charcoal tube/solvent desorption/ gas chromatographic method
KS H ISO 11454:2004 Tobacco and tobacco products－Determination of vapour-phasenicotine in air－Gas-chromatographic method
KS H ISO 11454-2004 Tobacco and tobacco products－Determination of vapour-phasenicotine in air－Gas-chromatographic method
KS M 0031-2022 General rules for gas chromatographic analysis
KS I ISO 8762-2006(2011) Workplace air－Determination of vinyl chloride(Charcoal tube/gas chromatographic method)
KS I ISO 19739-2010(2021) Natural gas－Determination of sulfur compounds using gas chromatography

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 9486:2017 Workplace air -- Determination of vaporous chlorinated hydrocarbons -- Charcoal tube/solvent desorption/gas chromatographic method

Lithuanian Standards Office

LST ISO 8762:2003 Workplace air. Determination of vinyl chloride. Charcoal tube/gas chromatographic method (idt ISO 8762:1988)
LST ISO 9487:2003 Workplace air. Determination of vaporous aromatic hydrocarbons. Charcoal tube/solvent desorption/gas chromatographic method (idt ISO 9487:1991)
LST ISO 9486:2003 Workplace air. Determination of vaporous chlorinated hydrocarbons. Charcoal tube/solvent desorption/gas chromatographic method (idt ISO 9486:1991)

International Organization for Standardization (ISO)

ISO 9487 Workplace air - Determination of vaporous aromatic hydrocarbons - Charcoal tube/solvent desorption/gas chromatographic method
ISO 6569:1981 Natural gas; Rapid analysis by gas chromatography
ISO 12884 Ambient air - Determination of total (gas and particle-phase) polycyclic aromatic hydrocarbons - Collection on sorbent-backed filters with gas chromatographic/mass spectrometric analyses
ISO 6568:1981 Natural gas; Simple analysis by gas chromatography
ISO 16000-33:2024 Indoor air - Part 33: Determination of phthalates with gas chromatography/mass spectrometry (GC/MS)
ISO 16702:2001 Workplace air quality - Determination of total isocyanate groups in air using 2-(1-methoxyphenyl) piperazine and liquid chromatography

Indonesia Standards

SNI 19-4843-1998 Metode pengujian kandungan gas hidrokarbon (HC) di udara dengan alat kromatografi gas

Swedish Institute for Standards

SS-ISO 12884:2000 Ambient air - Determination of total (gas and particulate-phase) polycyclic aromatic hydrocarbons - Collection on sorbent-backed filters with gas chromatographic/mass spectrometric analyses

Association of German Mechanical Engineers

VDI 2100 Blatt 5-2020 Ambient air – Determination of volatile organic compounds, especially ozone precursors – Gas chromatography method

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

TCVN 3757-1983 Natural gases.Determination of hydrocarbon content by gas chromatography

Yugoslav Association for Standardization

JUS H.F8.122-1986 Gases. Determination of oxygen content. Gas chromatographic method

Society of Automotive Engineers (SAE)

SAE J1151-1988 METHANE MEASUREMENT USING GAS CHROMATOGRAPHY