In the spectrophotometric determination of wastewater

In the spectrophotometric determination of wastewater, Total:200 items.

The international standard classification for "In the spectrophotometric determination of wastewater" includes: Water of natural resources , Sewage water , Animal feeding stuffs , Nickel, chromium and their alloys , Fissile materials , Water quality , Solid wastes , Other non-ferrous metals and their alloys , Fruits and derived products .

The Chinese standard classification for "In the spectrophotometric determination of wastewater" includes: Environmental pollutant monitoring methods , Basic standards and general methods for water treatment agent , Analysis methods for industrial wastewater and pollutants , Livestock and poultry feed and additive , Heavy metals and their alloys analysis method , Nuclear material, nuclear fuel and their analytical test method , Analysis methods for toxic substances in water , Analysis methods for industrial residue pollutants , Boiler and its auxiliary equipment , Agriculture and forestry technology , Aquatic product and fishery in general , Basic standards and general methods , Diagnostic standard for occupational diseases .

Jilin Provincial Standard of the People's Republic of China

DB22/T 3427-2023 Volumetric and spectrophotometric methods for the determination of cyanide in thiocyanate-containing wastewater

Ministry of Ecology and Environment of the People's Replublic of China

GB 13580.13-1992 Determination of calcium and magnesium in the wet precipitation - Atomic absorption spectrophotometry
GB 4918-1985 Waste Water from manufacturing process-Determination of total nitro compounds-Spectrophotometric method
GB 13580.12-1992 Determination of sodium and potassium in the wet precipitation - Atomic absorption spectrophotometry

Professional Standard - Chemical Industry

HG/T 3526-2003 Industrial circulating cooling water-Determination of nitrite-Molecular absorption spectrometric method
HG/T 4550.1-2013 Determination of Cadmium in the Waste Chemicals - Part 1: Graphite Furnace Atomic Absorption Spectrophotometric Method
HG/T 4550.2-2013 Determination of Cadmium in Waste Chemicals - Part 2: Flame Atomic Absorption Spectrophotometric Method
HG/T 4551.2-2013 Determination of Nickel in Waste Chemicals - Part 2: Atomic Absorption Spectrophotometry Method
HG/T 4327-2012 Reclaimed water—Determination of total iron content—Spectrophotometric method
HG/T 4551.3-2013 Determination of Nickel in Waste Chemicals - Part 3: Graphite Furnace Atomic Absorption Spectrophotometric Method
HG/T 4550.3-2013 Determination of Cadmium in Waste Chemicals - Part 3: Cadion Spectrophotometic Method
HG/T 4552.2-2013 Method for the Measurement in Tin-content in Spent Tin-stripping Solution - Part 2: Atomic Absorption Spectrophotometry Method
HG/T 4551.1-2013 Determination of Nickel in Waste Chemicals - Part 1: Dimethylglyoxime Spectrophotometric Method

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

GB/T 17036-1997 Determination of germanium in uranium geological samples--Salicyl fluorone spectrophotometry
GB/T 27985-2011 Determination of tannin in feeds—Spectrophotometry
GB/T 15400-1994 Determination of tryptophan in feedstuffs - Spectrophotometry
GB/T 15555.10-1995 Solid waste - Determination of nikel - Dimethylglyoxime spectophotometric method
GB/T 17777-2009 Determination of molybdenum in feeds - Spectrophotometry
GB/T 7481-1987 Water quality--Determination of ammonium--Spectrophotometric method with salicylic acid
GB/T 13903-1992 Water quality--Determination of TNT--Spectrophotometry
GB/T 6437-2018 Determination of phosphorus in feeds—Spectrophotometry
GB/T 4918-1985 Waste water from manufacturing process--Determination of total nitro compounds--Spectrophotometric method
GB 7481-1987 Water quality; Determination of ammonium; Spectrophotometric method with salicylic acid
GB/T 13903-1992 13905-1992 Determination of Water Quality TNT by Spectrophotometry
GB/T 8647.1-1988 Nickel; Determination of iron content; Sulfosalicylic acid spectrophotometric method
GB/T 13580.12-1992 Determination of sodium and potassium in the wet precipitation.Atomic absorption spectrophotometry
GB/T 13900-1992 quality - Determination of RDX - Spectrophotometry
GB/T 15555.1-1995 Solid waste-Determination of total mercury-Cold atomic absorption spectrometry
GB/T 17777-1999 Determination of molybenum in feedstuff--Spectrophotometry

Taiwan Provincial Standard of the People's Republic of China

CNS 8842-1993 Method of Test for Potassium in Industrial Waste Water(Flame Emission Spectrophotometric Method)
CNS 8843-1993 Method of Test for Sodium in Industrial Waste Water(Flame Emission Spectrophotometric Method)
CNS 8998-1982 Method of Test for Copper in Industrial Waste Water - Atomic Absorption Spectrophotometric Method
CNS 8997-1982 Method of Test for Copper in Industrial Waste Water - Spectrophotometric Method
CNS 13108-1992 Method of Test for Chromium `6rVI`6sin Water by Spectrophotometric Method
CNS 8601-1982 Method of Test for Sulfate Ion in Industrial Waste Water - Spectrophotometric Method

Professional Standard - Energy

NB/SH/T 0891-2014 Spectrophotometric detection of soot in used engine oil samples

Professional Standard - Petroleum

SY/T 0530-2011 Determination of Oil Content in Oilfield Produced Water. Spectrophotometry Method
SY 0530-2011 Spectrophotometric method for determination of oil content in oilfield produced water
SY/T 0530-1993 Spectrophotometric method for the determination of oil content in oilfield sewage

Professional Standard - Energy and Power Planning

DL/T 522.1-1993 Determination of acetoxime (DMKO) in water

Shanghai Provincial Standard of the People's Republic of China

DB31/T 232-2000 Determination of Boron in Sewage--Carminic Acid Spectrophotometry

Professional Standard - Non-ferrous Metal

YS/T 1071-2015 Chemical analysis methods of hydrogen peroxide spent catalysts―Determination of palladium content―Spectrometry

Professional Standard - Coal

MT/T 364-1994 Determination method of cadmium in coal mine water - Atomic absorption spectrophotometry
MT/T 361-1994 Determination of Copper in Coal Mine Water - Atomic Absorption Spectrophotometry
MT/T 365-1994 Method for Determination of Manganese in Coal Mine Water - Atomic Absorption Spectrophotometry
MT/T 363-1994 Determination of Zinc in Coal Mine Water - Atomic Absorption Spectrophotometry
MT/T 362-1994 Determination method of lead in coal mine water-Atomic absorption spectrophotometry

Professional Standard - Agriculture

NY/T 1279-2007 Determination of Nitrate in Vegetables and Fruits UV-spectrophotometer
NY/T 2016-2011 Determination of pectin content in fruit and derived product-Spectrophotometry method

Group Standards of the People's Republic of China

T/QAS 031-2021 Spectrophotometric method for the determination of iodine in brine
T/LNEMA 004-2022 Determination of Boron in Drinking Water by Flow Injection Spectrophotometry
T/QAS 037-2021 Spectrophotometric method for the determination of nitrite in brine
T/QAS 036-2021 Spectrophotometric method for the determination of bromine in brine
T/QAS 034-2021 Spectrophotometric method for determination of fluorine in brine

Professional Standard - Commodity Inspection

SN/T 4779.3-2017 Determination of total hardness in bottled water for export—Method by spectrophotometry coupled with flow injection analysis(FIA)

Xinjiang Provincial Standard of the People's Republic of China

DB65/T 4372-2021 Determination of Petroleum in Solid Waste Infrared Spectrophotometry

Professional Standard - Aquaculture

SC/T 3031-2006 Determination of volatile phenolic compounds residues in fishery products Spectrophotometric method

Professional Standard - Hygiene

WS/T 107-1999 Method for determination of iodine in urine by As (III)-Ce4+catalytic spectrophotometry
WS/T 60-1996 Urine - Determination of pentachlorophenol - Spectrophotometric method
WS/T 52-1996 Urine - Determination of hippuric acid - Spectrophotometric method
WS/T 36-1996 Urine - Determination of chromium - Spectrophotometric method
WS/T 48-1996 Urine - Determination of phenol - Spectrophotometric method
WS/T 97-1996 Urine - Determination of creatinine - Spectrophotometric method
WS/T 43-1996 Urine—Determination of nickel—Spectrophotometric method

Shandong Provincial Standard of the People's Republic of China

DB37/T 4150-2020 Determination of Water Quality β-Naphthol by Fluorescence Spectrophotometry
DB37/T 1954-2011 Determination of Mercury and Arsenic in Agricultural Water by Atomic Fluorescence Spectrometry
DB37/T 4149-2020 Determination of water quality UV254 by ultraviolet spectrophotometry

Professional Standard - Environmental Protection

HJ 543-2009 Stationary source emission-Determination of mercury-Cold atomic absorption spectrophotometry (Provisional)
HJ 536-2009 Water quality-Determination of ammonia nitrogen-Salicylic acid spectrophotometry
HJ 712-2014 Solid waste - Determination of total phosphorus - Ammonium metamolybdate spectrophotomtric method

Tianjin Provincial Standard of the People's Republic of China

DB12/T 847-2018 Spectrophotometric method for the determination of total sugar in feed

Professional Standard - Petrochemical Industry

SH/T 0020-1990 Determination of phosphorus content in gasoline (Spectrophotometric method)

Professional Standard - Water Conservancy

SL 88-2012 Water quality - Determination of chlorophyll - Spectrophotometry

Professional Standard - Nuclear Industry

EJ/T 991-1996 Spectrophotometric Determination of Titanium in Uranium Dioxide
EJ/T 815-1994 Spectrophotometric Determination of Thorium in UF6

Indonesia Standards

SNI 6989.80:2011 Air dan air limbah - Bagian 80: Cara uji warna secara spektrofotometri
SNI 6989.71:2009 Air and wastewater – Part 71: Spectrophotometric method for the determination of hexavalent chromium (Cr-VI) in test samples
SNI 6989.77:2011 Air dan air limbah - Bagian 77: Cara uji sianida (CN-) secara spektrofotometri
SNI 6989.77-2011 Water and waste water - Part 77: Determination of cyanide (CN-) by spectrophotometry
SNI 06-6989.21-2004 Water and waste water - Test methods of phenol content by spectrophotometry
SNI 06-6989.29-2005 Air dan air limbah - Bagian 29: Cara uji fluorida (F-) secara spektrofotometri dengan SPADNS
SNI 06-6989.9-2004 Water and waste water - Part 9: Test methods of nitrites (NO2-N) by spectrophotometry
SNI 6989.70:2009 Air dan air limbah – Bagian 70: Cara uji sulfida dengan biru metilen secara spektrofotometri
SNI 6989.70-2009 Water and wastewater. Part 70: Spectrophotometric determination of sulfide content with methylene blue
SNI 6989.68-2009 Water and wastewater. Part 68: Determination of cobalt content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.18-2009 Water and wastewater. Part 18: Determination of nickel content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.5-2009 Water and wastewater. Part 5: Determination of manganese content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.34-2009 Water and wastewater. Part 34: Determination of aluminum content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.7-2009 Water and waste water - Part 7: Test methods of zinc (Zn) by flame-atomic absorption spectrophotometers (AAS)
SNI 6989.4-2009 Water and wastewater. Part 4: Determination of iron content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.16-2009 Water and wastewater. Part 16: Determination of cadmium content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.69-2009 Water and wastewater. Part 69: Determination of potassium content by flame atomic absorption spectrophotometry (AAS)
SNI 6989.8-2009 Water and wastewater. Part 8: Determination of lead by flame atomic absorption spectrophotometry (AAS)
SNI 6989.17-2009 Water and wastewater. Part 17: Determination of total chromium content by flame atomic absorption spectrophotometry (AAS)
SNI 06-6989.35-2005 Water and waste water - Part 35: Test methods of dissolved aluminium (Al) content by spectrophotometers with eriochrome cyanine R
SNI 6989.6-2009 Water and wastewater. Part 6: Determination of copper content by graphite furnace atomic absorption spectrophotometry (AAS)
SNI 6989.63-2009 Water and wastewater. Part 63: Determination of silver content by graphite furnace atomic absorption spectrophotometry (AAS)
SNI 6989.16:2009 Water and wastewater – Part 16: Method for the determination of cadmium (Cd) by atomic absorption spectrophotometry (AAS) – flame
SNI 6989.64-2009 Water and wastewater. Part 64: Determination of tin content by graphite furnace atomic absorption spectrophotometry (AAS)
SNI 6989.46-2009 Water and wastewater. Part 46: Determination of lead by graphite furnace atomic absorption spectrophotometry (AAS)
SNI 6989.71-2009 Water and wastewater. Part 71: Spectrophotometric determination of hexavalent chromium by diphenylcarbazide
SNI 6989.2-2009 Water and wastewater. Part 2: Determination of chemical oxygen demand (COD) content by closed reflux spectrophotometry
SNI 06-4822-1998 Test methods for manganese content in water by spectrophotometer in persulphate manner
SNI 6989.2:2009 Air dan air limbah - Bagian 2: Cara uji Kebutuhan Oksigen Kimiawi (Chemical Oxygen Demand, COD) dengan refluks tertutup secara spektrofotometri

Standards Norway

NS 9804-1993 Water analysis. Determination of fat in wastewater from food processing industries. Infrared spectrophotometric method
NS 9804:1993 Water analysis — Determination of fat in wastewater from food processing industries — Infrared spectrophotometric method
NS 9803:1993 Water analysis — Determination of oil in water — Infrared spectrophotometric method
NS 9803-1993 Water analysis. Determination of oil in water. Infrared spectrophotometric method
NS 4799-1993 Water analysis. Determination of acid soluble aluminium in water. Photometric method
NS 4729:1991 Water analysis — Determination of available chlorine in water — Photometric method
NS-EN 10178:2024 Steels - Determination of niobium - Spectrophotometric method
NS 4787:1988 Water analysis — Determination of colour — Spectrophotometric method
NS 4787:2002 Water quality — Determination of colour — Method by spectrophotometric determination of absorbans at 410 nm
NS 4866:1984 Air quality - Determination of sulphate in precipitation - Spectrophotometric thorin method
NS 4799:1993 Water analysis — Determination of acid soluble aluminium in water — Photometric method

Polski Komitet Normalizacyjny (PKN)

PN C97087-1987 UV Spectrophotometric determination of phenols in coke and waste waters
PN C04642-06-1993 Water and waste water. Tests for pollutants in atmopheric precipitation. Determination of chlorides by spectrophotometric method
PN C04587 ArkusZ01-1973 Water and waste water Tests for sodium Determination of sodium by fla- me photometric method
PN C04591 ArkusZ01-1974 Water and waste water Tests for potassium Determination of potassium by flame photometric method
PN C04616-09-1987 Water and waste water Special tests for sediments Determination of the specific nitrate reductases activity of the microorganisms occuring in the denitrifying reactors by the spectrophotometric method
PN C04570-12-1993 Water and waste water Tests for metals by atomie absorption spectrometry Determination of molybdenum in water with preliminary concentration on chelating resin Dowex A-l
PN C04570-07-1987 Water and waste water Test for metals by atomie absorption Determination of the total chromium in water with preliminary concentration by chelation and extraction
PN C04570-02-1992 Water and waste water Tests for metals by atomie ab_sorption spectrometry Determination of zinc, copper, lead, cadmium, nickel and cobalt in water with preliminary concentration on chelating resin Dowex A-J
PN C04570-11-1992 Water and waste water Tests for metals by atomie absorption spectromectry Determination of zinc, copper, lead, cadmium, nickel and cobalt in water with preliminary concentration on a chelating oxamide resine
PN C04288-15-1987 Technical fats Methods ot' testing Determination of nickel Spectrophotometric method
PN C04613-1988 Water and waste water Determination of uric acid in water by means of tetramercurate fluoresceine
PN C04583 ArkusZ10-1971 Water and wastewater Turbidity and transparency tests Determination of transparency by the standard plate method
PN C04570-08-1987 Water and waste water Tests for metals by atomie absorption spectrometry Determination of total chromium
PN C04570-04-1992 Waler and waste water Tests for melals by atomie absorption spectrometry Determination of zinc, cupper, lead, cadmium, nickel, cobalt, iron and manganese in water with preliminary concer.tration by chelation and extraction

Swedish Institute for Standards

SIS SS 02 81 03-1991 Determination of fat in wastewater from food processing industries — Infrared spectrophotometric method
SS 28103:1991 Determination of fat in wastewater from food processing industries - Infrared spectrophotometric method
SIS SS 02 81 45-1991 Determination ofoilin water — Infrared spectrophotometric method
SIS SS 02 82 10-1992 Water analysis — Determination of acid soluble aluminium in water — Photometric method
SS 28145:1996 Determination of oil in water - Infrared spectrophotometric method
SIS SS 02 81 46-1980 Determination of chlorophyll in water — Extraction with acetone — Spectrophotometric method
SS 28146:1980 Determination of chlorophyll in water - Extraction with acetone - Spectrophotometric method
SIS SS 02 81 77-1986 Determination of easily liberatable cyanide in water — Photometric or titrimetric method
SS 28170:1983 Determination of chlorophyll a in water - Extraction with methanol - Spectrophotometric method
SIS SS 02 81 70-1983 Determination of chlorophyll a in water - Extraction with methanol - Spectrophotometric method
SS 28172:1989 Determination of available chlorine in water - Photometric method
SIS SS 02 81 76-1986 Determination of total cyanide in water - Photometric or titrimetric method
SS 28210:1992 Water analysis - Determination of acid soluble aluminium in water - Photometric method
SS-EN ISO 18724:2025 Water quality — Determination of dissolved chromium(VI) in water — Photometric method (ISO 18724:2025, IDT)

Universal Oil Products Company (UOP)

UOP 592-1985 Determination of palladium in catalysts - Visible spectrophotometry
UOP 917-1993 PALLADIUM IN FRESH AND SPENT ALUMINA CATALYST BY SPECTROPHOTOMETRY
UOP 715-1985 Refrain from automatic translation due to potential lack of standard naming convention

Danish Standards Foundation

DS/R 209:1980 Determination of oil and grease in water. Infrared spectrophotometric method
DS 289:1992 Water quality. Determination of colour. Spectrophotometric method
DS 2201:1986 Water quality. Chlorophyll a. Spectrophotometric determination in ethanol extract
DS/R 209:2006 Determination of oil and grease in water - Extraction with tetrachloroethylene and measurement by infrared spectrophotometry
DS/ISO 13161:2011 Water quality - Measurement of polonium 210 activity concentration in water by alpha spectrometry

American Society for Testing and Materials (ASTM)

ASTM E1786-96 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM E1786-24 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM E1786-17 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM E1786-08 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM E1786-02 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM E1786-17a Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine by On-Line Infrared Spectrophotometry
ASTM UOP682-84 Total Cyanide in Refinery Waters by Visible Spectrophotometry
ASTM UOP876-93 Platinum in Chloroplatinic Acid by Spectrophotometry
ASTM E1754-95(2001)e1 Standard Test Method for Determination of Low Levels of Water in Liquid Chlorine By Infrared Spectrophotometry

British Standards Institution (BSI)

BS EN ISO 18724:2025 Water quality. Determination of dissolved chromium(VI) in water. Photometric method
BS EN 13506:2002 Water quality - Determination of mercury by atomic fluorescence spectrometry
BS EN 13506:2002*BS 6068-2.74:2002 Water quality - Determination of mercury by atomic fluorescence spectrometry
24/30463987 DC BS EN ISO 18724 Water quality — Determination of dissolved chromium(VI) in water — Photometric method

Netherlands Institute for Standardization

NEN 3235 7.5-1978 Test methods for waste water. Photometric determination of lead content
NEN 3235 7.2a-1978 Test methods for waste water. Photometric determination of chromium(VI)content
NEN 3235 8.3-1978 Test methods for waste water. Photometric rietermination of sulphide content

Ente Nazionale Italiano di Unificazione

UNI EN 10178:1990 Chemical analisys of ferrous materials. Determination of niobium in steels. Spectrophotometric method.
UNI EN 10200:1994 Chemical analysis of ferrous materials. Determinaton of boron in steel. Spectrophotometric method.
UNI 8809:1987 Chemical anlysis of ferrous materials. Determination of niobium in steels. Spectrophotometric method.
UNI EN 10178:2024 Steels - Determination of niobium - Spectrophotometric method
UNI EN 1136:1997 Fruit and vegetable juices. Determination of phpsphorus content. Spectrometric method.
UNI CEN/TS 15479:2006 Fertilizers - Spectrophotometric determination of biuret in urea
UNI 10545:1996 Water intended for human consumption. Determination of aluminium. Flameless atomic absorption spectrometric method using a graphite fumace.
UNI 6458:1969 Chemical analysis of ferrous materials. Determination of silicon in steels and cast irons. Spectrophotometric method
UNI EN ISO 4945:2019 Steel - Determination of nitrogen - Spectrophotometric method

Association Francaise de Normalisation

NF A06-320*NF EN 10178:2024 Steels - Determination of niobium - Spectrophotometric method
NF EN 10178:2024 Steels - Determination of niobium - Spectrophotometric method
NF T90-139*NF EN ISO 17852:2008 Water quality - Determination of mercury - Method using atomic fluorescence spectrometry
NF T90-025:1967 TESTING WATER. SPECTROPHOTOMETRIC DETERMINATION OF SELENIUM.
NF T90-024:1963 TESTING WATER. SPECTROPHOTOMETRIC DETERMINATION OF MANGANESE.

Finnish Standards Institute

SFS 3043-1978 Determination of hydrolyzed aluminum. Spectrophotometry
SFS-EN ISO 18724:2025 Water quality. Determination of dissolved chromium(VI) in water. Photometric method (ISO 18724:2025)
SFS 3028-1976 Determination of iron element in water. Spectrophotometry
SFS 3033-1976 Determination of manganese element in water. Spectrophotometry

Austrian Standards

ONORM M 6262-1982 Water analysis, determination of arsenic, spectrophotometric method Analyse des eaux, dosage de l'arsenic, methode spectrophotometrique

Korean Agency for Technology and Standards (KATS)

KS M 2304-2014 Method for determination of phosgene in exhaust gas
KS M 2304-2006 Method for determination of phosgene in exhaust gas
KS D ISO 4945-2002(2017) Steel－Determination of nitrogen content－Spectrophotometric method
KS D ISO 9441-2002(2017) Steel－Determination of niobium content－PAR spectrophotometric method

German Institute for Standardization

DIN EN 10178:2024 Steels - Determination of niobium - Spectrophotometric method
DIN EN 10178:2024-10 Steels - Determination of niobium - Spectrophotometric method

European Committee for Standardization (CEN)

FprEN ISO 18724 Water quality - Determination of dissolved chromium(VI) in water - Photometric method (ISO/FDIS 18724:2025)
prEN 10212-1991 Chemical analysis of ferrous materials; determination of arsenic in steel and iron; spectrophotometric method

Spanish Association for Standardization (UNE)

UNE 36317-1:1985 DETERMINATION OF NITROGEN CONTENT OF STEELS. SPECTROPHOTOMETRIC METHOD

Standard Association of Australia （SAA）

AS 2723:1984 Waters - Determination of uranium (VI) - Spectrophotometric method

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

TCVN 7724-2007 Water quality.Determination of merdury.Method using atomic fluorescence spectrometry
TCVN 7558-1-2005 Solid waste incinerators.Determination of total concentration of organic compounds in fluegas.Part 1: Spectrophotometry method

International Organization for Standardization (ISO)

ISO/DIS 18724:2024 Water quality-Determination of dissolved chromium(VI) in water-Photometric method
ISO/CD 18724:2023 Water quality — Determination of dissolved chromium(VI) in water — Photometric method

Others: In the spectrophotometric determination of wastewater,Alkaline potassium persulfate digestion ultraviolet spectrophotometric method for the determination of total nitrogen in water, in