UV absorption of boric acid

UV absorption of boric acid, Total:140 items.

In the international standard classification, UV absorption of boric acid involves: Petroleum products in general, Ferroalloys, Analytical chemistry, Edible oils and fats. Oilseeds, Products of the textile industry, Products of the chemical industry, Inorganic chemicals, Air quality, Organic chemicals, Waxes, bituminous materials and other petroleum products, Non-destructive testing, Vocabularies, Natural gas, Physics. Chemistry, Paints and varnishes, Lubricants, industrial oils and related products, Non-ferrous metals, Power stations in general, Protection against crime, Tobacco, tobacco products and related equipment, Wastes, Materials and articles in contact with foodstuffs, Materials for aerospace construction, Water quality, Kitchen equipment, Semiconducting materials, Fuels, Metalliferous minerals.

American Society for Testing and Materials (ASTM), UV absorption of boric acid

ASTM D2008-12(2018) Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-23 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-91(1996)e1 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-91(2001) Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-85 Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-91(2006) Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-12 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D2008-09 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
ASTM D1768-89(1995)e1 Standard Test Method for Sodium Alkylbenzene Sulfonate in Synthetic Detergents by Ultraviolet Absorption
ASTM D1768-89(2003) Standard Test Method for Sodium Alkylbenzene Sulfonate in Synthetic Detergents by Ultraviolet Absorption
ASTM D1768-89(2016) Standard Test Method for Sodium Alkylbenzene Sulfonate in Synthetic Detergents by Ultraviolet Absorption
ASTM D1768-89(2009) Standard Test Method for Sodium Alkylbenzene Sulfonate in Synthetic Detergents by Ultraviolet Absorption
ASTM D2269-99e1 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2269-99(2005) Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2269-10 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2269-99 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2269-10(2015) Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2269-10(2020) Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
ASTM D2703-95 Standard Practice for Rubber Chemicals-Determination of Ultraviolet Absorbance Characteristics
ASTM F1349-08(2019) Standard Test Method for Nonvolatile Ultraviolet (UV) Absorbing Extractables from Microwave Susceptors
ASTM F1349-08 Standard Test Method for Nonvolatile Ultraviolet (UV) Absorbing Extractables from Microwave Susceptors
ASTM F1349-98(2003) Standard Test Method for Nonvolatile Ultraviolet (UV) Absorbing Extractables from Microwave Susceptors
ASTM F1349-98 Standard Test Method for Nonvolatile Ultraviolet (UV) Absorbing Extractables from Microwave Susceptors
ASTM F1349-08(2014) Standard Test Method for Nonvolatile Ultraviolet 40;UV41; Absorbing Extractables from Microwave Susceptors
ASTM D5955-02 Standard Test Methods for Estimating Contribution of Environmental Tobacco Smoke to Respirable Suspended Particles Based on UVPM and FPM
ASTM D5955-02(2012)e1 Standard Test Methods for Estimating Contribution of Environmental Tobacco Smoke to Respirable Suspended Particles Based on UVPM and FPM
ASTM D5955-02(2007) Standard Test Methods for Estimating Contribution of Environmental Tobacco Smoke to Respirable Suspended Particles Based on UVPM and FPM
ASTM D5156-02(2016) Standard Test Methods for Continuous Measurement of Ozone in Ambient, Workplace, and Indoor Atmospheres (Ultraviolet Absorption)
ASTM D5156-22 Standard Test Methods for Continuous Measurement of Ozone in Ambient, Workplace, and Indoor Atmospheres (Ultraviolet Absorption)
ASTM D5156-02 Standard Test Methods for Continuous Measurement of Ozone in Ambient, Workplace, and Indoor Atmospheres (Ultraviolet Absorption)
ASTM F1500-98(2019) Standard Test Method for Quantitating Non-UV-Absorbing Nonvolatile Extractables from Microwave Susceptors Utilizing Solvents as Food Simulants
ASTM D8368-21 Standard Test Method for Determination of Totals of Saturate, Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV)
ASTM D8368-22 Standard Test Method for Determination of Totals of Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectr
ASTM D8368-22a Standard Test Method for Determination of Totals of Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectr
ASTM D8369-21 Standard Test Method for Detailed Hydrocarbon Analysis by High Resolution Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy (GC-VUV)
ASTM D836-84 Standard test method for detailed analysis of hydrocarbons by high-resolution gas chromatography using vacuum ultraviolet absorption spectrometry (GC-VUV)
ASTM D836-77 Standard test method for detailed analysis of hydrocarbons by high-resolution gas chromatography using vacuum ultraviolet absorption spectrometry (GC-VUV)
ASTM F1500-98(2003) Standard Test Method for Quantitating Non-UV-Absorbing Nonvolatile Extractables from Microwave Susceptors Utilizing Solvents as Food Simulants
ASTM F1500-98 Standard Test Method for Quantitating Non-UV-Absorbing Nonvolatile Extractables from Microwave Susceptors Utilizing Solvents as Food Simulants
ASTM F1500-98(2008) Standard Test Method for Quantitating Non-UV-Absorbing Nonvolatile Extractables from Microwave Susceptors Utilizing Solvents as Food Simulants
ASTM F1500-98(2014) Standard Test Method for Quantitating Non-UV-Absorbing Nonvolatile Extractables from Microwave Susceptors Utilizing Solvents as Food Simulants
ASTM D8519-23 Standard Test Method for Determination of Hydrocarbon Types in Waste Plastic Process Oil Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV)

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, UV absorption of boric acid

GB/T 3653.7-2020 Ferroboron—Determination of sulfur content—Infrared absorption method
GB/T 19267.2-2008 Physical and chemical examination of trace evidence in forensic sciences.Part 2:Ultraviolet-visible absorption spectroscopy
GB/T 19267.2-2003 Physical and chemical examination of trace evidence in forensic sciences--Part 2: Ultraviolet-visible absorption spectroscopy
GB/T 21131-2007 Environmental tobacco smoke.Estimation of its contribuion to respirable suspended particles.Determination of particulate matter by ultraviolet absorbance and by fluorescence
GB/T 22661.4-2008 Chemical analysis methods of potassium fluoborate.Part4:Determination of magnesium content.Flame atomic absorption spectrometric method
GB/T 22661.5-2008 Chemical analysis methods of potassium fluoborate.Part5:Determination of calcium content.Flame atomic absorption spectrometric method
GB/T 22661.7-2008 Chemical analysis methods of potassium fluoborate.Part7:Determination of sodium content.Flame atomic absorption spectrometric method
GB/T 11060.13-2023 Natural gas—Determination of sulfur compound—Part 13：Determination of hydrogen sulfide content by ultraviolet absorption method
GB/T 1819.10-2004 Methods for chemical analysis of tin concentrates Determination of sulphur content-The high frequency infrared absorption method and the combustion potassium iodate titrimetric method
GB/T 24224-2009 Chromium ores.Determination of sulfur content.Combustion-neutralization titration method,combustion-potassium iodate titration method and combustion-infrared absorption method

GOST, UV absorption of boric acid

GOST EN 16344-2016 Cosmetic sun protection products Qualitative determination of UV filters and quantitative determination of 10 UV filters by high performance liquid chromatography

AENOR, UV absorption of boric acid

UNE 55047:1973 FATS. SPECTROPHOTOMETRIC MEASURE OF ABSORPTION IN THE ULTRAVIOLET AREA.
UNE 77401:1992 ECOTOXICOLOGY. DETERMINATION OF UV-VIS ABSORPTION SPECTRA.
UNE 55084:1978 FATS. PURIFICATION METHOD OF OLIVE OIL BY CHROMATOGRAPHIC ON ALUMINA, BY DETERMINIG THE ABSORPBANCE IN THE ULTRAVIOLET.
UNE-ISO 15593:2010 Environmental tobacco smoke -- Estimation of its contribution to respirable suspended particles -- Determination of particulate matter by ultraviolet absorbance and by fluorescence

International Organization for Standardization (ISO), UV absorption of boric acid

ISO 3656:1989 Animal and vegetable fats and oils; determination of ultraviolet absorbance
ISO/DIS 11626 Natural gas- Determination of sulfur compounds- Determination of hydrogen sulfide content by UV absorption method
ISO 3656:2002 Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction
ISO 15593:2001 Environmental tobacco smoke - Estimation of its contribution to respirable suspended particles - Determination of particulate matter by ultraviolet absorbance and by fluorescence
ISO 6918:1984 Crude sodium borates for industrial use; Determination of total and alkali-soluble calcium and magnesium contents; Flame atomic absorption spectrometric method
ISO 29441:2010 Water quality - Determination of total nitrogen after UV digestion - Method using flow analysis (CFA and FIA) and spectrometric detection

PL-PKN, UV absorption of boric acid

PN Z04200-02-1988 Air purity protection ests for oxalic acid etermination of oxalic acid by ltraviolet absorption spectrophotometry
PN Z04171-02-1986 Air purity protection ests for picric acid etermination of picric acid n work places by UV pectrophotometry absorption
PN Z04169-02-1986 Air purity.protection Tests for 4,6-dinitroorthocreso! Determination of 4,6-dinitroorthocresol in work places by UV spectrophotometry absorption

SCC, UV absorption of boric acid

AWWA WQTC60557 Natural UV Absorbers That Simulate Low Water UVT Conditions — Optimizing UV Reactor Validation
ANS 8.5-1986 Use of Borosilicate-Glass Raschig Rings as a Neutron Absorber in Solutions of Fissile Material
ANS 8.5-1996(R2022) Use of Borosilicate-Glass Raschig Rings as a Neutron Absorber in Solutions of Fissile Material
SPC GB/T 37186-2018 Gas analysis -- Determination of sulfur dioxide and nitrogen oxides -- Ultraviolet differential optical absorption spectroscopy (TEXT OF DOCUMENT IS IN CHINESE)
DANSK DS/ISO 15593:2001 Environmental tobacco smoke - Estimation of its contribution to respirable suspended particles - Determination of particulate matter by ultraviolet absorbance and by fluorescence
BS 2782-4 METHOD 434A:1975 Methods of testing plastics. Chemical properties-The identification of antioxidants and ultra-violet absorbers in polyolefin compounds by thin layer chromatography
AWWA WQTC69304 UV Advanced Oxidation Process for Taste and Odor Treatment: Evaluation of Assimilable Organic Formation Potential at an Indiana WTP
DIN EN 18015 E:2023 Draft Document - Automotive fuels - Determination of hydrocarbon group types and select hydrocarbon and oxygenate compounds - Gas chromatography with vacuum ultraviolet absorption spectroscopy (GC-VUV) method; German and English version prEN 18015:2023
BS 2782-4 METHOD 434C:1977 Methods of testing plastics. Chemical properties-Determination of antioxidants in polyolefin compounds by ultra-violet absorption of the toluene/ethanol extract in ethanol solution

British Standards Institution (BSI), UV absorption of boric acid

BS EN ISO 3656:2011 Animal and vegetable fats and oils. Determination of ultraviolet absorbance expressed as specific UV extinction
BS ISO 11626:2024 Natural gas. Determination of sulfur compounds. Determination of hydrogen sulfide content by UV absorption method
23/30450716 DC BS ISO 11626. Natural gas. Determination of sulfur compounds. Determination of hydrogen sulfide content by UV absorption method
BS ISO 15593:2001 Environmental tobacco smoke - Estimation of its contribution to respirable suspended particles - Determination of particulate matter by ultraviolet absorbance and by fluorescence

国家市场监督管理总局、中国国家标准化管理委员会, UV absorption of boric acid

GB/T 39109-2020 Textiles—Determination of benzophenone ultraviolet absorbents
GB/T 39114-2020 Nanotechnologies—Characterization of single-wall carbon nanotubes using ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy
GB/T 37186-2018 Gas analysis—Determination of sulfur dioxide and nitrogen oxides—Ultraviolet differential optical absorption spectroscopy
GB/T 4333.7-2019 Ferrosilicon—Determination of sulfur content—Infrared absorption method and chromatographic separation-barium sulfate gravimetric method

YU-JUS, UV absorption of boric acid

JUS H.G8.074-1983 Reagents. Bori? acid. Determination of calcium and magnesium contents. Flame atomic absorption method

Qinghai Provincial Standard of the People's Republic of China, UV absorption of boric acid

DB63/T 1298-2014 Determination of Pb Content in Salt Lake Boric Acid Products by Atomic Absorption Spectrometry

IN-BIS, UV absorption of boric acid

IS 1448 Pt.105-1981 Test methods for petroleum and its products [P: 105] Ultraviolet (UV) absorption and absorbance of petroleum products
IS 1448 Pt.143-1993 Test methods for petroleum and its products [P: 143] Ultraviolet absorption evaluation of white mineral oil

Shandong Provincial Standard of the People's Republic of China, UV absorption of boric acid

DB37/T 2704-2015 Determination of nitrogen oxides in exhaust gas from stationary pollution sources by ultraviolet absorption method
DB37/T 2705-2015 Determination of sulfur dioxide in exhaust gas from stationary pollution sources by ultraviolet absorption method
DB37/T 3786-2019 Determination of gaseous pollutants such as hydrogen sulfide in ambient air Open path ultraviolet absorption spectrometry

Hebei Provincial Standard of the People's Republic of China, UV absorption of boric acid

DB13/T 5467-2021 Portable UV Absorption Method for Determination of Ammonia in Exhaust Gas from Stationary Pollution Sources

Liaoning Provincial Standard of the People's Republic of China, UV absorption of boric acid

DB21/T 3073-2018 Determination of sulfur dioxide in exhaust gas from stationary pollution sources by ultraviolet absorption method
DB21/T 3072-2018 Determination of nitrogen oxides in exhaust gas from stationary pollution sources by ultraviolet-visible absorption method

工业和信息化部, UV absorption of boric acid

HG/T 5674-2020 Method for determination of ultraviolet absorber content in triacetyl cellulose (TAC) films with optical functional films
YS/T 424.4-2022 Methods for chemical analysis of titanium diboride powder Part 4: Determination of carbon content High-frequency combustion infrared absorption method
YS/T 424.5-2022 Methods for chemical analysis of titanium diboride powder Part 5: Determination of oxygen content Pulse heating inert gas melting-infrared absorption method

GSO, UV absorption of boric acid

GSO ASTM D2269:2023 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
BH GSO ASTM D2269:2023 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
GSO ISO/TS 10868:2013 Nanotechnologies -- Characterization of single-wall carbon nanotubes using ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy
GSO ISO 15593:2014 Environmental tobacco smoke -- Estimation of its contribution to respirable suspended particles -- Determination of particulate matter by ultraviolet absorbance and by fluorescence

Professional Standard - Commodity Inspection, UV absorption of boric acid

SN/T 1032-2002 Method for the determination of ultra-violet absorbents in cosmetics for import and export.Liquid chromatography
SN/T 1032-2018 Determination of UV absorbers in cosmetics for import and export by liquid chromatography
SN/T 2738-2010 Food contact materials for export.Polymers.Determination of ultraviolet-absorbance in food simulants of PMMA

Professional Standard - Chemical Industry, UV absorption of boric acid

HG/T 4952-2016 Determination of ultraviolet absorbent for TAC film by High Performance Liquid Chromatographic method

Professional Standard - Environmental Protection, UV absorption of boric acid

HJ 1131-2020 Portable UV Absorption Method for Determination of Sulfur Dioxide in Exhaust Gas from Stationary Pollution Sources
HJ 1132-2020 Portable UV Absorption Method for Determination of Nitrogen Oxide in Exhaust Gas from Stationary Pollution Sources

PH-BPS, UV absorption of boric acid

PNS ISO/TS 17466:2021 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots

European Committee for Standardization (CEN), UV absorption of boric acid

ISO/DIS 3656:2000 Animal and Vegetable Fats and Oils - Determination of Ultraviolet Absorbance Expressed as Specific UV Extinction

海关总署, UV absorption of boric acid

SN/T 5258-2020 Determination of UV-320 and UV-328 ultraviolet absorbers in paints by high performance liquid chromatography
SN/T 5259-2020 Determination of UV-320, UV-327, UV-328 and UV-350 UV absorbers in coatings by gas chromatography-mass spectrometry

Korean Agency for Technology and Standards (KATS), UV absorption of boric acid

KS D 2717-2008(2018) Evaluation of metallic/semiconducting ratio of single-walled carbon nanotube soots using UV-VIS－NIR absorption spectroscopy
KS H ISO 15593:2009 Environmental tobacco smoke－Estimation of its contribution to respirable suspended particles－Determination of particulate matter by ultraviolet absorbance and by fluorescence
KS H ISO 15593-2009(2019) Environmental tobacco smoke－Estimation of its contribution to respirable suspended particles－Determination of particulate matter by ultraviolet absorbance and by fluorescence
KS M 9102-1996(2001) WATER QUALITY-DETERMINATION OF TOTAL MERCURY BY FLAMELESS ATOMIC ABSORPTION SPECTROMETRY(METHOD AFTER PRETREATMENT WITH ULTRAVIOLET RADITION)

Association Francaise de Normalisation, UV absorption of boric acid

NF T60-607:1998 Produits pétroliers et lubrifiants - Détermination de l'indice d'absorption UV de l'extrait DMSO des huiles de coupe entières
NF T75-122:1982 ESSENTIAL OILS. OILS OF CITRUS. DETERMINATION OF CD VALUE BY ULTRAVIOLET SPECTROPHOTOMETRIC ANALYSIS.
NF M07-073:2001 Petroleum products - Determination of the content of total aromatic hydrocarbons in saturated fractions - Ultra-Violet absorbance spectrometric method for low contents.
NF V37-044*NF ISO 15593:2001 Environmental tobacco smoke - Estimation of its contribution to respirable suspended particles - Determination of particulate matter by ultraviolet absorbance and by fluorescence.

Professional Standard - Rare Earth, UV absorption of boric acid

XB/T 617.6-2014 Chemical analysis methods of neodymium iron boron alloy.Part 6:Determination of carbon content.High frequency-infrared absorption method
XB/T 601.4-2008 Chemical analysis methods of lanthanum boride.Determination of carbon content.High frequency induced combustion infrared ray absorbs method
XB/T 617.7-2014 Chemical analysis methods for neodymium iron boron alloy.Part 7:Determination of oxygen and nitrogen contents.Impulse-infrared and impulse-thermal conductance absorption method
XB/T 617.8-2023 Chemical analysis methods for neodymium iron boron alloy— Part 8: Determination of hydrogen content— Thermal conductivity/infrared absorption method after fusion under inert gas

American Nuclear Society (ANS), UV absorption of boric acid

ANS 8.5-1996(R2002) Use of borosilicate-glass Raschig rings as a neutron absorber in solutions of fissile material

ANS - American Nuclear Society, UV absorption of boric acid

8.5-1996 Use of borosilicate-glass Raschig rings as a neutron absorber in solutions of fissile material

Professional Standard - Electricity, UV absorption of boric acid

DL/T 502.28-2006 Analytical methods of steam and water in power plants Part 28: Determination of organic matter (Ultraviolet spectrophotometry)

Indonesia Standards, UV absorption of boric acid

SNI 19-6670-2002 Determination of heavy metal content in solid waste by lithium metaborate fusion in an atomic absorption spectrophotometers (AAS)

Group Standards of the People's Republic of China, UV absorption of boric acid

T/CITS 0006-2021 Determination of ultraviolet absorbents in plastic materials and products contacted with food-Ultra performance convergence chromatography
T/AHEPI 0002-2024 Determination of five kinds of exhaust gas odor pollutants ammonia, trimethylamine, carbon disulfide, styrene, methyl sulfide portable ultraviolet differential absorption method

AT-ON, UV absorption of boric acid

ONORM ISO 5666 Teil.2:1984 Water quality; determination of total mercury by flameless atomic absorption spectrometry; method after pretreatment with ultraviolett radiation

Danish Standards Foundation, UV absorption of boric acid

DS/ISO 15593:2001 Environmental tobacco smoke - Estimation of its contribution to respirable suspended particles - Determination of particulate matter by ultraviolet absorbance and by fluorescence

Military Standards (MIL-STD), UV absorption of boric acid

DOD A-A-51872-1987 SUTURE, ABSORBABLE, SURGICAL, (POLYGLYCOLIC ACID)

中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会, UV absorption of boric acid

GB/T 35916-2018 Simultaneous determination of 16 kinds of permitted sunscreen agents and other 8 kinds of ultraviolet absorbents in cosmetics—HPLC

German Institute for Standardization, UV absorption of boric acid

DIN 50449-2:1998 Testing of materials for semiconductor technology - Determination of impurity content in semiconductors by infrared absorption - Part 2: Boron in gallium arsenide
DIN 38404-3:2005 German standard methods for the examination of water, waste water and sludge - Physical and physicochemical parameters (group C) - Part 3: Determination of spectral absorption in the UV range, Spectral absorptions coefficient (C 3)
DIN 38404-3:2005-07 German standard methods for the examination of water, waste water and sludge - Physical and physical-chemical parameters (group C) - Part 3: Determination of absorption in the range of the ultraviolet radiation, Spectral absorptions coefficient (C 3)
DIN EN 18015:2023 Automotive fuels - Determination of hydrocarbon group types and select hydrocarbon and oxygenate compounds - Gas chromatography with vacuum ultraviolet absorption spectroscopy (GC-VUV) method; German and English version prEN 18015:2023

未注明发布机构, UV absorption of boric acid

DIN 38404-3:1976 German standard methods for the examination of water, waste water and sludge - Physical and physicochemical parameters (group C) - Part 3: Determination of spectral absorption in the UV range, Spectral absorptions coefficient (C 3)
ASTM RR-D02-2027 2022 D8368 - Test Method for Determination of Totals of Saturate, Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV)

Professional Standard - Non-ferrous Metal, UV absorption of boric acid

YS/T 1028.4-2015 Methods for chemical analysis of lithium iron phosphate.Part 4:Determination of carbon content.High frequency combustion with infrared absorption method

Professional Standard - Ferrous Metallurgy, UV absorption of boric acid

YB/T 5317-2016 Calcium silicon alloy.Determination of sulfur content.High frequency combustion with infrared absorption method and the combustion-potassium iodate titration method