Powder UV Spectrum

Powder UV Spectrum, Total:185 items.

The international standard classification for "Powder UV Spectrum" includes: Other non-ferrous metals and their alloys , Analytical chemistry in general , Other treatments and coatings , General methods of tests and analysis for food products , Optics and optical measurements , Plastics in general , Jewellery , Beekeeping , Chemical analysis , Alcohols. Ethers , Protection against fire in general , Medicaments , Colours and measurement of light , Physicochemical methods of analysis , Materials for the reinforcement of composites in general .

The Chinese standard classification for "Powder UV Spectrum" includes: Rare metals and their alloys , Electrochemical, thermochemistry and optical profile type analyzer , Material Protection , Rare metals and their alloys analysis method , Basic standards and general methods , Inorganic chemicals in general , Basic standards and general methods for synthetic resin and plastic , Other non-metal ore , Beekeeping, silkworm keeping , Basic standards and general methods , Basic organic chemicals , Fire protection technology , Pharmaceutical in general , Meteorology , Synthetic materials in general , chromatograph , Artistic handicrafts , Carbon material in general , Electron optics and other physical optics instrument , Chemical Measurement , Cosmetics .

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

GB/T 30457-2013 Test Methods of Rare Earth Ultraviolet Emission Phosphors for Fluorescent Lamps
GB/T 21005-2007 UV erythema reference action spectrum standard erythema dose and UV index
GB/T 14571.4-2008 glycol for industrial use - Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method
GB/T 26813-2011 Double beam UV/VIS spectrophotometer
GB/T 25481-2010 On-line ultraviolet/visible spectrum analyzer
GB/T 22980-2008 Determination of flunixin residue in bovine milk and milk powder - LC-UV method
GB/T 24369.1-2009 Characterization of gold nanorods—Part 1:UV-Vis-NIR absorption spectroscopy
GB/T 23195-2008 Method for the determination of catalase in bee pollen - Ultaraviolet spectrophotometry
GB/T 23209-2008 Determination of lutein in milk powder—HPLC-UV method
GB/T 41072-2021 Surface chemical analysis - Electron spectroscopies - Guidelines for ultraviolet photoelectron spectroscopy analysis
GB/T 30456-2013 Rare Earth Ultraviolet Emission Phosphors for Fluorescent Lamps
GB/T 18294.1-2001 Technical identification method fire - Part 1: Ultraviolet spectrum analysis
GB/T 37131-2018 Nanotechnologies—Test method of semiconductor nanopowder using UV-Vis diffuse reflectance spectroscopy
GB/T 26798-2011 Single beam UV/VIS spectrophotometer
GB/T 34406-2017 Identification of pearl powder - Near infrared spectroscopy method
GB/T 18294.1-2013 Technical identification methods for fire—Part 1:Ultraviolet spectrometry
GB/T 43297-2023 Plastics—Methodology for assessing polymer photoageing—FTIR and UV/visible spectroscopy
GB/T 39114-2020 Nanotechnologies—Characterization of single-wall carbon nanotubes using ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy
GB/T 37131-2018e Nanotechnologies—Test method of semiconductor nanopowder using UV-Vis diffuse reflectance spectroscopy
GB/T 37594-2019 Technical specification for anti-UV three-layer external fusion powder coating corrosion protection for steel pipe
GB/T 37131-2018(英文版) Nanotechnology - Testing method of UV-visible diffuse reflectance spectrum of semiconductor nanopowder materials
GB/T 43484-2023 Additive manufacturing—Supperalloy powder used for laser powder bed fusion
GB/T 42645-2023 Gems testing—Ultraviolet-visible absorbtion spectroscopy

Professional Standard - Education

JY/T 0570-2020 General rules for ultraviolet and visible absorption spectrometry
JY/T 022-1996 General rules for ultraviolet and visible absorption spectrometry

Group Standards of the People's Republic of China

T/CAQI 74-2019 Gems testing—UV-visble spectroscopy
T/CGWSTC 001-2024 Determination of multiple components in ceramic raw materials by X-ray fluorescence spectrometry (powder pellets)
T/CGWSTC 001-2022 Determination of various components in ceramic raw materials X-ray fluorescence spectrometry (powder compression)
T/STIC 110086-2023 Double Beam UV-VIS Spectrophotometer
T/ZGIA 002-2020 Graphene Test Methods Determination of Work Function Ultraviolet Photoelectron Spectroscopy
T/ZSA 39-2020 Characterization of Graphene - Work function - Ultraviolet photoelectron spectroscopy (UPS) method
T/NAIA 0214-2023 Determination of Major Elements in Coal Gangue by Powder Compression-X-ray Fluorescence Spectrometry
T/GMES 004-2018 Determination of various components in chromite by X-ray fluorescence spectrometry (powder compression)

Shandong Provincial Standard of the People's Republic of China

DB37/T 4115-2020 Jewelry and jade identification by ultraviolet-visible spectroscopy

Professional Standard - Agriculture

47药典四部-2020 0401 UV-visible spectrophotometry
67药典四部-2015 0401 UV-visible spectrophotometry
775兽药典一部-2015 Appendix Contents 0400 Spectroscopy 0401 UV-Vis Spectrophotometry
JJG(教委) 022-1996 Verification Regulations for Ultraviolet and Visible Absorption Spectrometers
772兽药典二部-2015 Appendix Contents 0400 Spectroscopy 0401 UV-Vis Spectrophotometry

Professional Standard - Medicine

YY 91060-1999 Vocabulary of biochemical instruments. UV-VIS spectrophotometry

Military Standard of the People's Republic of China-General Armament Department

GJB 506-1988 Testing method for spectral performance of UV filter quartz glass tubes

Taiwan Provincial Standard of the People's Republic of China

CNS 14247-1998 Method of test for naphthalene hydrocarbons in aviation turbine fuels by ultravioet spectrophotometry

Professional Standard - Ferrous Metallurgy

YB/T 6012-2022 Blast furnace slag--Determination of multi-element contents-X-ray fluorescence spectrometry( pressed disc method)
YB/T 5159-2007 Determination of silicon and iron in graphite products of high purity by spectroscopical method - The powder method
YB/T 5159-1993 Determination of silicon and iron in graphite products of high purity by spectroscopical method―The powder method

Professional Standard - Public Safety Standards

GA/T 1701-2019 Forensic Science Toner Inspection Infrared Spectroscopy

Professional Standard - Commodity Inspection

SN/T 5153-2019 Determination of fluorescent whitening agents in tissue paper-UV spectroscopy method

Professional Standard - Machinery

JB/T 6778-1993 UV/VIS Near Infrared Spectrophotometer
JB/T 6777-1993 UV/VIS Spectrophotometer
JB/T 6836-1993 UV filter
JB/T 13361-2018 Optical filters for the UV, visible and near-infrared spectral ranges
JB/T 6836-2014 Ultra Violet Filter
JB/T 14893-2025 Additive manufacturing—Mould steel powder for laser-based powder bed fusion

Shanghai Provincial Standard of the People's Republic of China

DB31/ 4-2-1989 UV sterilizer

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

JJG 689-1990 UV-VIS-NIR Spectrophotometer

Professional Standard - Electron

SJ/T 11475-2014 UV curable coating for optical fibre

未注明发布机构

FORD M98G26-A-1990 GLASS POLISHING COMPOUND - POWDER FORM

Professional Standard - Light Industry

QB/T 2334-1997 Method for the Qualitative Determination of Ultraviolet Absorbents in Cosmetics - Ultraviolet Spectrophotometry

Professional Standard - Chemical Industry

HG/T 3027-1988 Determination of plasticizer content in polymethylmethacrylate-Ultraviolet spectrometry method
HG/T 3027-1988(1997) Determination of plasticizer content in polymethylmethacrylate-Ultraviolet spectrometry method

Professional Standard - Water Conservancy

SL 93.2-1994 Determination of oil and grease (Vltraviolet spectrophotometric method)

Guangdong Provincial Standard of the People's Republic of China

DB44/T 1723-2015 Ultraviolet (UV) Curing Mobile Phone Shell Coatings

General Motors Corporation (GM)

GM 9984306-2003 Powder Topcoat for Small Parts with Limited UV Exposure

International Commission on Illumination (CIE)

CIE 151-2003 SPECTRAL WEIGHTING OF SOLAR ULTRAVIOLET RADIATION
CIE 151:2003 Spectral weighting of solar ultraviolet radiation (incl. disk)

SCC

SPC GB/T 37594-2019 Technical specification for anti-UV three-layer external fusion powder coating corrosion protection for steel pipe (TEXT OF DOCUMENT IS IN CHINESE)

American Society for Testing and Materials (ASTM)

ASTM E2193-16 Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (using Ultraviolet Spectrophotometry)
ASTM E958-13(2021) Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
ASTM E2193-02 Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (Ultraviolet Spectrophotometric Method)
ASTM E958-93(2005) Standard Practice for Measuring Practical Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
ASTM E2193-04 Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (Ultraviolet Spectrophotometric Method)
ASTM E2193-08 Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (Ultraviolet Spectrophotometric Method)
ASTM E2193-02a Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (Ultraviolet Spectrophotometric Method)
ASTM E2999-25 Standard Test Methods for Analysis of Organic Compounds in Smokeless Powder by Gas Chromatography-Mass Spectrometry and Fourier Transform Infrared Spectroscopy
ASTM E958-13 Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
ASTM E29-93a(1999) Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ASTM E29-90 Standard Practice for Using Digits in Test Data to Determine Conformance with Specifications
ASTM E2999-17 Standard Test Method for Analysis of Organic Compounds in Smokeless Powder by Gas Chromatography-Mass Spectrometry and Fourier Transform Infrared Spectroscopy
ASTM E958-93(1999) Standard Practice for Measuring Practical Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
ASTM E129-74(1993)e1 Test Method: Spark Spectrometry Analysis of Thermoelectric Nickel Alloy Powder Technology

GM North America

GM GMP.TPU.028-2002 TPU - UV Stabilized, Heat Stabilized, Castable Powder
GMP.PVC.042-2011 PVC ?UV Stabilized, Heat Stabilized, Castable Powder Issue 3; Do Not Use on New Programs; Replaced by GMW16081
GM GMP.ABS.004-1990 ABS - Ultraviolet Light Stabilized, Low Gloss
GM GMP.ABS.002-1990 ABS - Ultraviolet Light Stabilized, Low Gloss

Spanish Association for Standardization (UNE)

UNE-ISO 4735:2009 Oils of Citrus. Determination of CD value by ultraviolet espectrometric analysis
UNE-EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
AENOR UNE-EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
UNE-EN 615:1996 FIRE PROTECTION. FIRE EXTINGUISHING MEDIA. SPECIFICATIONS FOR POWDERS (OTHER THAN CLASS D POWDERS)
UNE 77401:1992 ECOTOXICOLOGY. DETERMINATION OF UV-VIS ABSORPTION SPECTRA.
UNE 77-401-1992 Ecotoxicology. Determination of UV-VIS absorption spectra of a chemical compoud
UNE 84170:1983 OIL OF LEMON. ULTRA-VIOLET SPECTROPHOTO METRIC ANALYSIS
UNE-EN ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges (ISO 11151-1:2015)

Korean Agency for Technology and Standards (KATS)

KS H ISO 4735-2014(2019) Oils of Citrus－Determination of CD value by ultraviolet spectrometric analysis
KS H ISO 4735-2014(2024) Oils of Citrus－Determination of CD value by ultraviolet spectrometric analysis
KS D ISO 14168:2012 Metallic powders, excluding hardmetals－Method for testing copper-base infiltrating powders
KS M 1074-2008 Determination of antimony in ceramic powder－Hydride generation atomic absorption spectrometry
KS M 1074-2008(2023) Determination of antimony in ceramic powder－Hydride generation atomic absorption spectrometry
KS B ISO 11151-1:2003 Lasers and laser-related equipment-Standard optical components-Part 1:Components for the UV, visible and near-infrared spectral ranges
KS B ISO 11151-1:2015 Lasers and laser-related equipment ― Standard optical components ― Part 1: Components for the UV, visible and near-infrared spectral ranges
KS B ISO 11151-1:2013 Lasers and laser-related equipment — Standard optical components — Part 1: Components for the UV, visible and near-infrared spectral ranges
KS M 1074-2023 Determination of antimony in ceramic powder－Hydride generation atomic absorption spectrometry
KS B ISO 11151-1-2015(2020) Lasers and laser-related equipment ― Standard optical components ― Part 1: Components for the UV, visible and near-infrared spectral ranges
KS B ISO 11151-1-2020 Lasers and laser-related equipment ― Standard optical components ― Part 1: Components for the UV, visible and near-infrared spectral ranges

Danish Standards Foundation

DS/EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
DANSK DS/EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
DANSK DS/CEN/CR 13840:2000 Petroleum products - Determination of polycyclic aromatic hydrocarbons - Ultraviolet (UV) spectrometric method
DS/CEN/CR 13840:2000 Petroleum products - Determination of polycyclic aromatic hydrocarbons - Ultraviolet (UV) spectrometric method
DS/EN 24496:1994 Metallic powders-Determination of acid-insoluble content in iron,copper,tin and bronze powders
DANSK DS/EN ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges
DS/EN ISO 11151-1:2000 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges
DS/EN ISO 3656:2011 Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction

Lithuanian Standards Office

LST EN 615-2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)

NL-NEN

NEN 6306-1990 Vegetable and animal oils and fats Determination of extinction co?ffici?nt in the ultraviolet spectre

Standards Norway

NS-EN 615:1994 Fire protection — Fire extinguishing media — Specifications for powders (other than class D powders)
NS-EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
SN-CR 13840:2000 Petroleum products — Determination of polycyclic aromatic hydrocarbons — Ultraviolet (UV) spectrometric method

Ente Nazionale Italiano di Unificazione

EC 1-2007 UNI EN 615:2003 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
UNI EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
UNI EN 615:1997 Fire protection. Fire extinguguishing media. Specifications for powders (other than class D powders).
UNI EN ISO 11151-1:2001 Lasers and laser-related equipment - Standard optical components - Components for the UV, visible and near- infrared spectral ranges
UNI EN ISO 3927:2017 Metallic powders, excluding powders for hardmetals - Determination of compressibility in uniaxial compression
UNI EN ISO 3927:2002 Metallic powders, excluding powders for hardmetals - Determination of compressibility in uniaxial compression
UNI EN ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 4735:2015 Oils of Citrus -- Determination of CD value by ultraviolet spectrometric analysis

Military Standards (MIL-STD)

MIL MIL-P-48239-1973 POWDER, PHOTOFLASH

Association Francaise de Normalisation

NF EN 615:2009 Fire protection - Extinguishing agents - Requirements for powders (other than class D powders)
NF ISO 4735:2002 Citrus essential oils - Determination of the CD value by ultraviolet spectrometric analysis
NF ISO 10640:2011 Plastics - Methodology for evaluating photoaging of polymers by IRTF and UV/visible spectroscopy
NF A95-121:1993 Metallic powders, excluding powders for hardmetals. Determinationof compactibility (compressibility)in uniaxial compression.
NF S10-111-1*NF EN ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1 : components for the UV, visible and near-infrared spectral ranges
NF S60-204:1995 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders).
NF EN ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1: components for the UV, visible and near-infrared spectral ranges

U.S. Military Regulations and Norms

ARMY MIL-P-48239 NOTICE 2-2013 POWDER, PHOTOFLASH

German Institute for Standardization

DIN EN 615:2009-08 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders); German version EN 615:2009
DIN EN 615 E:2008-09 Draft Document - Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders); German version prEN 615:2008
DIN EN 615 E:2008 Draft Document - Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders); German version prEN 615:2008
DIN ISO 14168:2005 Metallic powders, excluding hardmetals - Method for testing copper-base infiltrating powders (ISO 14168:2003)
DIN EN ISO 11151-1:2000 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the ultraviolet, visible and near-infrared spectral range (ISO 11151-1:2000); German version EN ISO 11151-1:2000
DIN EN ISO 11151-1:2015-12 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges (ISO 11151-1:2015); German version EN ISO 11151-1:2015
DIN EN ISO 11151-1 E:2013-05 Standard optical components for lasers and laser equipment Part 1: Components for the ultraviolet, visible and near-infrared spectral ranges (draft)

European Committee for Standardization (CEN)

EN 615:2009 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
EN 615:1994/prA1:2000 Fire Protection - Fire Extinguishing Media - Specifications for Powders (Other than Class D Powders)

CEN - European Committee for Standardization

EN 615:1994 Fire protection Fire extinguishing media Specifications for powders (other than class D powders) (Incorporates Amendment A1: 2001)

British Standards Institution (BSI)

BS EN 615:1995 Fire protection - Fire extinguishing media - Specifications for powders (other than class D powders)
08/30185760 DC BS EN 615. Fire protection. Fire extinguishing media. Specifications for powders (other than class D powders)
BS ISO 14168:2011 Metallic powders, excluding hardmetals. Method for testing copper-base infiltrating powders
BS EN ISO 11151-1:2000 Lasers and laser-related equipment. Standard optical components. Components for the UV, visible and near-infrared spectral ranges
BS EN ISO 11151-1:2015 Lasers and laser-related equipment. Standard optical components. Components for the UV, visible and near-infrared spectral ranges
BS ISO 13779-6:2015 Implants for surgery. Hydroxyapatite. Powders
BS EN ISO 4492:2013 Metallic powders, excluding powders for hardmetals. Determination of dimensional changes associated with compacting and sintering

American Water Works Association (AWWA)

AWWA WQTC64141 Comparison between the UV Action Spectrum of Bacillus subtilis Spores and the Standard DNA Absorbance Spectrum
AWWA JAW48196 Journal AWWA — Monitoring DBP Formation With Differential UV Spectroscopy
AWWA WQTC65712 On-line Monitoring of Drinking Water Treatment Efficacy Using UV/Vis-spectrometry

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ASTM E958:2022 Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
BH GSO ISO 3656:2016 Animal and vegetable fats and oils -- Determination of ultraviolet absorbance expressed as specific UV extinction

GCC Standardization Organization

GSO ASTM E958:2021 Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
GSO ISO 10640:2013 Plastics - Methodology for assessing polymer photoageing by FTIR and UV/visible spectroscopy
GSO ISO 3927:2015 Metallic powders, excluding powders for hardmetals -- Determination of compressibility in uniaxial compression
GSO ISO 3656:2015 Animal and vegetable fats and oils -- Determination of ultraviolet absorbance expressed as specific UV extinction

Swedish Institute for Standards

SS-EN 14625:2024 Ambient air — Standard method for the measurement of the concentration of ozone by ultraviolet photometry
SS-EN 61345:2002 UV test for photovoltaic (PV) modules
SS-EN ISO 3927:2011 Metallic powders, excluding powders for hardmetals - Determination of compressibility in uniaxial compression (ISO 3927:2011)

International Organization for Standardization (ISO)

ISO 14168:2011 Metallic powders, excluding hardmetals - Method for testing copper-base infiltrating powders
ISO 14168:2003 Metallic powders, excluding hardmetals - Method for testing copper-base infiltrating powders
ISO 11151-1:2000 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges
ISO 11151-1:2015 Lasers and laser-related equipment - Standard optical components - Part 1: Components for the UV, visible and near-infrared spectral ranges
ISO 3927:2011 Metallic powders, excluding powders for hardmetals - Determination of compressibility in uniaxial compression
ISO 3927:2017 Metallic powders, excluding powders for hardmetals - Determination of compressibility in uniaxial compression

Gosstandart of Russia

GOST ISO/TS 10868-2017 Nanotechnology. Single-wall carbon nanotubes. Characterization by absorption spectroscopy in the ultraviolet, visible and near infrared spectral regions..
GOST ISO 24443-2016 Cosmetic sun protection products Method for determining in vitro the value of the protective factor against ultraviolet radiation of spectrum A

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

ASHRAE EQUIP SI CH 16-2008 ULTRAVIOLET LAMP SYSTEMS

Society of Automotive Engineers (SAE)

SAE AMS7003A Laser Powder Bed Fusion Process
SAE AMS7003 Laser Powder Bed Fusion Process
SAE AMS7003A-2022 Laser Powder Bed Fusion Process
SAE AMS7003-2018 Laser Powder Bed Fusion Process

PL-PKN

PN H04951-1986 Powder metallurgy Determination of the particie size of powder by the optical microscope method

International Electrotechnical Commission (IEC)

IEC 61345:1998 UV test for photovoltaic (PV) modules

Indonesia Standards

SNI 04-6533-2001 UV tests for photovoltaic (PV) moduls

YU-JUS

JUS E.L8.013-1980 Determination of starch by enzymatic method (UV -test)

CZ-CSN

CSN ISO 4492:1993 Metallic powders, excluding powders for hardmetals. Determination of dimensional changes associated with compacting and sintering

GM Holden Ltd

HOLDEN HN 1668-2008 POWDER COAT FINISH FOR EXTERIOR BODY HARDWARE PARTS

Australian/New Zealand Standard (AU-AS/NZS)

AS/NZS 2433:1994 Plastics - Method for exposure to ultraviolet lamps

National Electrical Manufacturers Association（NEMA)

NEMA LSD 7-1999(2020) Standard for Ultraviolet Radiation From Fluorescent Lamps

Bureau of Indian Standards

IS 12570-2022 Metallic powders excluding powders for hardmetals Determination of dimensional changes associated with compacting and sintering
IS 16200-2015 Animal and Vegetable Fats and Oils - Determination of Ultraviolet Absorbance Expressed as Specific UV Extinction