Sodium sulfate industry

Sodium sulfate industry, Total:278 items.

The international standard classification for "Sodium sulfate industry" includes: Salts , Chemical reagents , Photographic chemicals , Surface active agents , food products in general .

The Chinese standard classification for "Sodium sulfate industry" includes: Inorganic salt , General inorganic reagent , Photographic-grade chemicals , Surface active agent , Food processing and products in general .

Professional Standard - Chemical Industry

HG/T 2328-1992 Industrial sodium thiosulfate
HGB 3158-1960 sodium bisulfite
HG/T 3814-2006 Sodium bisulfite for industrial use
HG/T 3812-2006 Sodium thiocyanate for industrial use
HG/T 2328-2006 Sodium hyposulfite for industry use
HG/T 4021-2008 Chemical reagent—Sodium pyrosulfite
HGB 3161-1960 Sodium sulfite (anhydrous)
HG/T 4516-2013 Sodium Bisulfate for Industrial Use
HG/T 2967-2000 Anhydrous sodium sulphite for industrial use
HG/T 2967-1997 Industrial Anhydrous Sodium Sulfite
HGB 3159-1960 Crystalline sodium sulfite
HG/T 2964-1984 Sodium hydrosulphide for industrial use-Determination of the content of sodium hydrosulphide ane sulphide
HG/T 4535-2013 Sodium Sulfate for Cosmetic Use
HG/T 2826-1997 Sodium metbisulphite for industrial use
HG/T 2967-2010 Anhydrous sodium sulphite for industrial use
HG/T 5743～5746-2020 Diammonium hydrogen phosphate for batteries, industrial ammonium sulfate, industrial silicon tetrachloride and industrial sodium orthosilicate (2020)
HGB 3160-1960 Sodium sulfate (anhydrous)
HG/T 2826-2008 Sodium metabisulphite for industrial use
HGB 3495-1962 Sodium thiocyanate
HGB 3171-1960 sodium bisulfate

Taiwan Provincial Standard of the People's Republic of China

CNS 1423-1962 Sodium Sulfite, Anhydrous (Industrial Grade)
CNS 5152-1980 Crystalline Sodium Thiosulphate (Photographic Grade)
CNS 1993-1978 Sodium Thiosulfate
CNS 435-1981 Sodium Sulfate, for Industrial Use
CNS 1342-1992 Sodium Dithionite for Industrial Use
CNS 1343-1992 Method of Test for Sodium Dithionite for Industrial Use
CNS 1421-1962 Sodium Thiosulfate (Industrial Grade)
CNS 1949-1991 Sodium Hydrogen Sulfite(Sodium Bisulfite)
CNS 1424-1963 Method of Test for Anhydrous Sodium Sulfite of Industrial Grade
CNS 1004-1974 Methods of Test for Sodium Sulfate, Technical Grade
CNS 1985-1978 Sodium Sulfate
CNS 1422-1962 Method of Test for Sodium Thiosulfate of Industrial Grade
CNS 2678-1966 Sodium Formaldehyde Sulfoxylate for Industrial Use
CNS 5842-1980 Anhydrous Sodium Sulfate for Use in Explosives

工业和信息化部

HG/T 5560-2019 Chromium compound by-product sodium sulfate
HG/T 4516-2022 Sodium bisulfate for industrial use

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

GB/T 15963-2022 Sodium lauryl sulfate
GB 637-1988 Chemical reagent Sodium thiosulfate pentahydrate
GB/T 15900-1995 Chemical reagent. Sodium pyrosulfite
GB/T 6009-2003 Anhydrous sodium sulfate for industrial use
GB/T 1268-1998 Chemical reagent--Sodium thiocyanate
GB/T 22402-2008 Photography - Processing chemicals - Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
GB/T 6009-2014 Anhydrous sodium sulfate for industrial use
GB/T 637-1988 Chemical reagent--Sodium thiosulfate pentahydrate
GB/T 15963-2008 Sodium lauryl sulfate
GB/T 26519.1-2011 Persulfate for industrial use—Part 1:Sodium persulfate for industrial use
GB/T 637-2006 Chemical reagent - Sodium thiosulfate pentahydrate
GB/T 15963-1995 Sodium lauryl sulfate
GB 10500-2009 Sodium sulfide for industrial use
GB/T 10500-2000 Sodium sulfide for industrial use

Group Standards of the People's Republic of China

T/CCT 001-2019 Coal chemical industry by-product industrial sodium sulfate
T/ZRX 004-2023 By-product sodium sulfate solution
T/CSTM 00702-2022 Chemical reagent — Sodium thiosulfate anhydrous
T/CIEP 0035-2023 Sodium sulfate decahydrate for industrial use
T/ZAQ 10106-2022 By-product industrial salt (sodium chloride, sodium sulfate)
T/ZZB Q056-2022 By-product industrial salt (sodium chloride, sodium sulfate)
T/ZJGFTR 018-2022 Regenerated sulfuric acid (organic silicon industry)
T/SDAS 220-2021 By-product sodium sulfite solution
T/ZRX 007-2023 By-product sodium sulfite
T/CHC 1007-2023 Chondroitin sulfate sodium
T/ZGZS 0303-2023 Reclaimed industrial salt—Sodium sulfate

国家市场监督管理总局、中国国家标准化管理委员会

GB/T 26519.1-2021 Persulfate for industrial use—Part 1:Sodium persulfate for industrial use

Professional Standard - Agriculture

GB 9005-1988 Anhydrous sodium sulphite for industrial use

Qinghai Provincial Standard of the People's Republic of China

DB63/T 1296-2014 Determination of sodium chloride and sulfate content in industrial sodium carbonate by ion chromatography

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

GB/T 10500-2009 Sodium sulfide for industrial use

HU-MSZT

MSZ 6067-1966 Sodium bisulfite, industrial sodium bisulfite
MNOSZ 9791-1953 Industrial sodium sulfate
MNOSZ 925-1950 Anhydrous sodium sulfate, industrial
MNOSZ 1015-1951 Sodium sulfite, anhydrous and industrial
MSZ 2194-1982 Sodium thiosulfate
MSZ 9793-1968 Sodium thiosulfate
MNOSZ 926-1950 Sodium sulfate (glauber's salt), crystallized, industrial use
MSZ 24215-1964 Sodium Thiosulfate Analysis
MSZ 9277-1957 Sodium sulfate for analysis
MNOSZ 9415-1955 yellow. sodium iron sulfate
MNOSZ 960-1950 crystalline sodium sulfite
MSZ KGST 1879-1979 Determination of sulfate content of industrial sodium hydroxide
MSZ 3298-1959 Industrial sodium sulfide
MSZ 9276-1966 Anhydrous sodium sulfate for analysis

Japanese Industrial Standards Committee (JISC)

JIS K 8973:1992 Sodium hydrogen sulfate monohydrate
JIS K 1471:1967 Sodium pyrosulfite (sodium metabisulfite)
JIS K 8638:1994 Sodium thiosulfate
JIS K 8061:1992 Sodium sulfite
JIS K 1435:1986 Sodium sulfide
JIS K 8987:1995 Sodium sulfate
JIS K 8987:2006 Sodium sulfate
JIS K 8059:1996 Sodium hydrogensulfite
JIS K 9002:1996 Sodium thiocyanate
JIS K 9568:1976 Sodium pyrosulfate
JIS K 1420:1958 Sodium thiosulfate (crystalline)
JIS K 8638:2011 Sodium thiosulfate (Reagent)
JIS K 1419:1958 Sodium sulphite (anhydride)
JIS K 8737:1996 Sodium dithionite
JIS K 8987:2022 Sodium sulfate (Reagent)
JIS K 8637:2006 Sodium thiosulfate pentahydrate
JIS K 1418:1958 Sodium sulphite (crystal)
JIS K 8637:1996 Sodium thiosulfate pentahydrate
JIS K 9002:2015 Sodium thiocyanate (Reagent)
JIS K 8959:1993 Aluminium sodium sulfate 12-water
JIS K 8059:2018 Sodium hydrogensulfite (Reagent)
JIS K 1200-4:2000 Sodium hydroxide for industrial use -- Part 4: Determination of sodium sulfate content
JIS K 7717:1986 Photographic grade sodium thiosulfate, crystalline
JIS K 8986:2013 Sodium sulfate decahydrate (Reagent)
JIS K 8986:1994 Sodium sulfate decahydrate
JIS K 8631:1961 Sodium thioglycollate

International Organization for Standardization (ISO)

ISO 5142:1977 Sodium sulphate for industrial use; Determination of sodium sulphate content; Gravimetric method
ISO 3235:1975 Sodium sulphate for industrial use; Determination of acid-insoluble matter
ISO 743:1976 Sodium carbonate for industrial use; Determination of sulphate content; Barium sulphate gravimetric method
ISO 3240:1975 Sodium sulphate for industrial use; Determination of acidity or alkalinity
ISO 3237:1975 Sodium sulphate for industrial use; Determination of sulphates content; Calculation method and barium sulphate gravimetric method
ISO 2480:1972 Sodium chloride for industrial use; Determination of sulphate content; Barium sulphate gravimetric method
ISO 982:1976 Sodium hydroxide for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
ISO 3200:1975 Sodium and potassium silicates for industrial use; Determination of sulphates content; Barium sulphate gravimetric method
ISO 10636:1994 Photography; processing chemicals; specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
ISO 3234:1975 Sodium sulphate for industrial use; Determination of loss in mass at 110 degrees C
ISO 1918:1972 Boric acid, boric oxide, disodium tetraborates and crude sodium borates for industrial use; Determination of sulphur compounds; Volumetric method
ISO 2486:1973 Potassium sulphate for industrial use — Determination of potassium content — Sodium tetraphenylborate volumetric method

Association Francaise de Normalisation

NF T20-459:1980 Sodium sulphate for industrial use. Determination of sodium sulphate content. Gravimetric method.
NF T20-417:1975 Sodium carbonate for industrial use. Determination of sulphate content. Barium sulphate gravimetric method.
NF T20-454:1976 Sodium sulphate for industrial use. Determination of sulphate content. Calculation method and barium sulphate gravimetric method.
NF T20-457:1976 Sodium sulphate for industrial use. Determination of acidity or alkalinity.
NF T20-527:1980 Sodium and potassium silicates for industrial use. Determination of sulphates content. Barium sulphate gravimetric method.
NF T20-405:1982 Sodium chloride for industrial use. Determination of sulphate content. Barium sulphate gravimetric method.
NF T20-429:1976 Sodium hydroxyde for industrial use. Determination of sulphate content. Barium sulphate gravimetric method.
NF T20-452:1976 Sodium sulphate for industrial use. Determination of acid-insoluble matter.
NF T20-451:1976 Sodium sulphate for industrial use . Determination of loss in mass at 110 degrees C.

RU-GOST R

GOST 6318-1977 Sodium sulphate technical. Specifications
GOST 11683-1976 Technical sodium pyrosulfite. Specifications
GOST 902-1976 Sodium bisulphite technical (aqueous solution). Specifications
GOST 246-1976 Hybrosulphite sodium technical. Specifications
GOST 244-1976 Sodium thiosulphate, crystalline. Specifications
GOST 13367-1977 Sodium thiocynate. Specifications
GOST 6053-1977 Reagents. Sodium bisulphate. Specifications
GOST 4166-1976 Reagents. Sodium sulphate. Specifications
GOST 27068-1986 Reagents. Sodium thiosulphate 5-aqueous. Specifications

CZ-CSN

CSN 65 3120-1986 Sodium thiosulphate crystalline for industrial use
CSN 68 5269-1969 Sodium metabisulphite (sodium pyro- ulphite)
CSN 68 5430-1974 Sodium thiosulphate
CSN 68 5493-1958 Sulfite
CSN 68 5401-1981 Sodium sulphate rystalliform
CSN 65 3127-1963 Crystallic sodium sulphate, technical
CSN 65 3122-1981 Sodium hydrosulphite technical.
CSN 68 5492-1969 Sodium sulfite anhydrous - Reagent

Defense Logistics Agency

DLA A-A-59160 VALID NOTICE 1-2004 SODIUM SULFITE, ANHYDROUS, TECHNICAL
DLA A-A-59160-1998 SODIUM SULFITE, ANHYDROUS, TECHNICAL
DLA A-A-59160 A-2009 SODIUM SULFITE, ANHYDROUS, TECHNICAL

RO-ASRO

STAS 6413-1986 TECHN1CAL SODICM F'ORMAL- DEHYDE SULPHOXYLATE
STAS 1491-1970 TECHNICAL SODIUM SULPHIDE
STAS SR ISO 2480:1995 Sodium chloride for industrial use. Determination of sulphate content. Barium sulphate gravimetric method
STAS 1817/2-1975 SODIUMTHIOSULFATE, TECHNICAL GRADE
STAS 1817/3-1974 SODIUM THIOSULFATE Methods of analysis
STAS 2126-1984 ANII YDUOUS TECUNICAL SODIl'M SULIMIATH
STAS 3018-1973 MILD STEEL VESSELS FOR SULPHURIC ACID AND SODIUM HYDROXIDE SOLUTIONS NP 6
SR 723-17-1997 Leather - Determination of sodoium sulphate
STAS SR 13371-1997 Sodium chloride. Determination of total iodine. Titrimetric Method with sodium thiosulfate

Korean Agency for Technology and Standards (KATS)

KS M 1422-2020 Sodium pyrosulfite(Sodium metabisulfite)
KS M 1422-2015(2020) Sodium pyrosulfite(Sodium metabisulfite)
KS M 1309-2014 Sodium thiosulfate
KS M 1416-2022 Sodium sulfate
KS M 1309-2009 Sodium thiosulfate
KS M 8114-1982 SODIUM SULFATE
KS M 1309-1984 Sodium thiosulfate
KS M 8114-1997 SODIUM SULFATE
KS M 1416-1986 Sodium sulfate
KS M 1416-2017(2022) Sodium sulfate
KS M 8557-2015 Sodium thiosulfate
KS M 1416-2017 Sodium sulfate
KS M 8113-2015 Sodium sulfite
KS M 8113-2015(2020) Sodium sulfite
KS M 8113-2020 Sodium sulfite
KS M 8117-2018 Sodium thiocyanate
KS M 8113-1986 Sodium sulfite
KS M 8117-2023 Sodium thiocyanate
KS M 1402-1987 Sodium sulfite(anhydride)
KS M 8557-2020 Sodium thiosulfate(Reagent)
KS M 1402-2002 Sodium sulfite(anhydride)
KS M 1402-2017(2022) Sodium sulfite(anhydride)
KS M 8557-2005 Sodium thiosulfate
KS M ISO 2480:2017 Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
KS M ISO 2480-2022 Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
KS M 1416-2012 Sodium sulfate
KS M 1422-1985 Sodium pyrosulfite(Sodium metabisulfite)
KS M ISO 2480-2017(2022) Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
KS M 8421-2023 Sodium sulfate decahydrate
KS M 8421-2018 Sodium sulfate decahydrate
KS M 8434-2018 Sodium hydrogensulfite
KS M ISO 2480:2012 Sodium chloride for industrial use-Determination of sulphate content-Barium sulphate gravimetric method
KS M 1422-2010 Sodium pyrosulfite(Sodium metabisulfite)
KS M 8434-2023 Sodium hydrogensulfite
KS M ISO 10636:2002 Photography－Processing chemicals－Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
KS M 8117-2012 Sodium thiocyanate
KS M 1309-2019 Sodium thiosulfate pentahydrate (crystalline)
KS M 8164-2013 Sodium hydrosulfite
KS M 1401-2017 Sodium sulfite(crystal)
KS M 8022-1996(2001) SODIUM THIOSULFATE PENTAHYDRATE
KS M 1401-2022 Sodium sulfite(crystal)
KS M 8112-2023 Sodium sulfite heptahydrate
KS M 8022-1986 SODIUM THIOSULFATE PENTAHYDRATE
KS M 1401-2002 Sodium sulfite(crystal)
KS M 8164-2004 Sodium hydrosulfite
KS M 1401-1987 Sodium sulfite(crystal)
KS M 1401-2017(2022) Sodium sulfite(crystal)
KS M ISO 10636:2019 Photography — Processing chemicals — Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
KS M 8049-1993 Sodium metaarsenite
KS M 1402-2017 Sodium sulfite(anhydride)
KS M 1422-2015 Sodium pyrosulfite(Sodium metabisulfite)
KS M 8049-2008 Sodium metaarsenite
KS M 1402-2022 Sodium sulfite(anhydride)
KS M 8434-2012 Sodium hydrogensulfite

TH-TISI

TIS 1142-1993 Sodium hydrosulphite for industrial use
TIS 723-1987 Standard for anhydrous sodium sulphate for industrial use

IN-BIS

IS 248-1978 Specification for sodium bisulfite (sodium metabisulfite)
IS 255-1982 Specification for Anhydrous Sodium Sulfate (Industrial Grade)
IS 3986-1988 Specification for sodium lauryl sulfate for use in the cosmetic industry
IS 1919-1982 Sodium bisulfite specification

BE-NBN

NBN T 03-179-1980 Sodium sulphate for industrial use - Determination of sodium sulphate content - Gravimetrie method
NBN T 03-241-1980 Sodium and potassium silicates for industrial use - Determination of sulphates content - Barium sulphate gravimetrie method
NBN T 03-162-1980 Sodium chloride for industrial use - Determination of sulphate content - Barium sulphate gravimetrie method
NBN T 03-177-1980 Sodium sulphate for industrial use - Determination of acidity of alkalinity
NBN T 03-110-1979 Sodium carbonate for industrial use - Determination of sulphate content - Barium sulphate gravimetrie method
NBN T 03-124-1980 Sodium hydroxide for industrial use - Determination of sulphate content - Barium sulphate gravimetrie method
NBN T 03-173-1980 Sodium sulphate for industrial use - Determination of ohlorides content -Mercurimetric method
NBN T 03-174-1980 Sodium sulphate for industrial use - Determination of sulphates content - Calculation method and barium sulphate gravimetric method
NBN T 03-172-1980 Sodium sulphate for industrial use - Determination of acid-insoluble matter

KR-KS

KS M 8117-2018(2023) Sodium thiocyanate
KS M ISO 2480-2017 Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
KS M 8434-2018(2023) Sodium hydrogensulfite
KS M 8421-2018(2023) Sodium sulfate decahydrate
KS M 1309-2019(2024) Sodium thiosulfate pentahydrate (crystalline)
KS M 8112-2018(2023) Sodium sulfite heptahydrate
KS M ISO 10636-2019 Photography — Processing chemicals — Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate

YU-JUS

JUS H.B8.320-1977 Sodium and potassium silicates for industrial use. Determination of sulphates content. Bariton sulphate gravimetric method
JUS H.G8.420-1990 Reagents. Sodium sulphite, anhydrous and sodium sulphite beptabydrate. ?eterminaticm of sodium sulphite and sodium sulphite heptahydrate contents. Volumetric method

GSO

OS GSO ISO 2480:2008 Sodium chloride for industrial use - Determination of sulphate content - Barium sulphate gravimetric method
GSO ISO 2480:2008 Sodium chloride for industrial use - Determination of sulphate content - Barium sulphate gravimetric method
GSO ISO 10636:2015 Photography -- Processing chemicals -- Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate

TR-TSE

TS 757-1969 SODIUM CARBONATE FOR INDUSTRIAL USE DETERMINATION OF SULPHATE CONTENT BARIUM SULPHATE GRAVIMERTIC METHOD
TS 2226-1976 SODIUM AND POTASSIUM SILICATES FOR INDUSTRIAL USE DETERMINATION OF SULPHATES CONTENT BARIUM SULPHATE GRAVIMETRIC METHOD
TS 1809-1975 BORIC ACID, BORIC OXIDE, DISODIUM TETRABORATES AND CRUDE SODIUM BORATES FOR INDUSTRIAL USE — DETERMINATION OF SULPHUR COMPOUNDS — VOLUMETRIC METHOD

IT-UNI

UNI 6022-1967 Sodium carbonate for industrial use. Sulfate determination. volumetric method

PT-IPQ

E 238-1970 Aggregate. Change test using sodium sulfate or magnesium sulfate
NP 1355-1976 Sodium sulfate used in industry. Measurement of pH value by potentiometric method
NP 1277-1976 Sodium sulfate used in industry. Measurement of acidity or alkalinity
NP 1246-1976 Sodium sulfate used in industry. Measurement of sulfuric acid composition by hydrometry
NP 1184-1976 Sodium carbonate used in industry. Measurement of sulfate content
NP 1280-1976 Sodium sulfate used in industry. Measurement of non-solubility in acids

American National Standards Institute （ANSI)

ANSI PH4.250-1980 Photographic Grade Sodium Thiosulfate, Anhydrous (Na2S2O3) and Sodium Thiosulfate, Crystalline (Na2S2O3. 5H2O)
ANSI/AWWA B601-2011 Sodium Metabisulfite
ANSI/AWWA B601-2005 Sodium Meta bisulfite
ANSI/AWWA B601-2017 Sodium Metabisulfite
ANSI/NAPM IT4.177-1983 Photography (Chemicals) - Sodium Thiocyanate Crystals and Sodium Thiocyanate Solution (50%)
ANSI PH4.177-1983 Photography (Chemicals) - Sodium Thiocyanate Crystals and Sodium Thiocyanate Solution (50%)
ANSI/I3A IT4.177-1983 Photography (Chemicals) – Sodium Thiocyanate

Indonesia Standards

SNI 06-2138-1991 Sodium metabisulphite
SNI 06-1314-1989 Technical grade sodium thiosulphate
SNI 3407-2008 Testing methods for agregat durability characteristics using sodium sulphate and magnesium sulphate solution
SNI 06-3737-1995 Technical sodium lauryl sulphate
SNI 2138-2013 Natrium metabisulfit teknis
SNI 06-0598-1989 Technical grade sodium carbonate

SCC

AWWA B601-2017 Sodium Metabisulfite
AWWA B601-2005 Sodium Metabisulfite
NS 9045:1981 Sodium hydroxide for industrial use — Determinatio of sulphate content — Barium sulphate gravimetric method
BS 3301:1960 Sodium thiosulphate hydrated photographic grade
BS 3302:1960 Sodium thiosulphate anhydrous photographic grade
AENOR UNE 55512-8:1970 SURFACE AGENTS. ANALYSIS OF TECHNICAL SODIUM ALKYLARYL-SULPHONATES. DETERMINATION OF SODIUM SULFITE CONTENT.

American Water Works Association (AWWA)

AWWA B601-2011 Sodium Metabisulfite
AWWA B601-2000 Sodium Metabisulfite

Spanish Association for Standardization (UNE)

UNE 55504-3:1981 SURFACE ACTIVE AGENTS. ANALYSIS OF TECHNICAL SODIUM SEC-ALKYLSULPHATES. DETERMINATION OF THE SODIUM SEC-ALKYLSULPHATES CONTENT
UNE 30189:1963 ANALYSIS REAGENTS. SODIUM THIOSULPHATE.

British Standards Institution (BSI)

BS ISO 10636:1994 Photography. Processing chemicals. Specification for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
BS ISO 10636:1994(2000) Photography — Processingchemicals — Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
BS ISO 10636:1995 Photography - Processing chemicals - Specification for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate

PK-PSQCA

PS 443-1975 SPECIFICATION FOR SODIUM THIOSULPHATE (REVISED)

AR-IRAM

IRAM 1525-P-1947 Hardness test of additives by hitting with sodium sulfate or magnesium sulfate
IRAM 17701-1959 Sodium thiosulfate crystal for photography
IRAM 17 702-1959 Sodium sulfite for photography

IL-SII

S.I.461-1962 SODIUM BISULPHITE SOLUTION

Lithuanian Standards Office

LST ISO 2480:2003 Sodium chloride for industrial use. Determination of sulphate content. Barium sulphate gravimetric method (idt ISO 2480:1972)