pH ratio

pH ratio, Total:251 items.

The international standard classification for "pH ratio" includes: Salts , Seals , Food additives , Protective gloves , Farming and forestry , Animal feeding stuffs , Waxes, bituminous materials and other petroleum products .

The Chinese standard classification for "pH ratio" includes: Inorganic salt , Rubber tube, rubber belt and tape , Rubber seal , Synthetic food additives , Articles for labor protection , Sugar-yielding crop and product , Livestock and poultry feed and additive , Fire-fighting equipment and devices , Petroleum wax .

Professional Standard - Water Conservancy

SL 82-1994 Determination of acidity (Base titration method)
SL 83-1994 Determination of alkalinity、bicarbonate and carbonate (Acid titration method)
SL 237-062-1999 Code for test of soil - acidity and alkalinity test

Professional Standard - Chemical Industry

HG/T 3782-2015 Acid-alkaline resistant conveyor belts
HG/T 2959-1988 Industrial hydrated basic magnesium carbonate
HG/T 4835-2015 Basic lead carbonate
HG/T 2183-2014 Dilute acid and alkali resistant rubber hose
HG/T 6068-2022 Sports anti-slip basic magnesium carbonate paste
HG/T 5026-2016 Recycled sulphuric acid from chlor-alkali industry
HG/T 4696-2014 Basic nickel carbonate for industrial use
HG/T 3782-2005 Acid-Alkaline resistant conveyor belts
HG 2183-1991 Dilute acid and alkali resistant rubber hose
HG/T 2523-1993 Industrial Basic Zinc Carbonate
HG/T 6067～6068-2022 Sports Anti-Slip Magnesium Carbonate Block and Sports Anti-Slip Magnesium Carbonate Paste (2022)
HG/T 2181-2009 Acid and alkali resistant rubber compounds for seals
HG/T 2678-2007 Basic Chromium Sulphate for industry use
HG/T 2678-1995 Industrial basic chromium sulfate
HG/T 2183-1991 Rubber hose for transporting dilute acid and alkali
HG/T 2181-1991 O-ring rubber material for acid and alkali
HG/T 6000-2022 Electromagnetic acid-base concentration meter
HG/T 6318-2024 Basic magnesium sulfate whiskers
HGB 3539-1962 Basic lead acetate
HG/T 2959-2010 Hydrated basic magnesium carbonate for industrial use
HG/T 2959-2023 Industrial hydrated basic magnesium carbonate
HG/T 4825-2015 Basic cupric carbonate for industrial use
HG/T 2678-2015 Basic chromium sulphate for industrial use
HG/T 6334-2024 Basic copper nitrate for industrial use
HG/T 2523-2007 Basic zinc carbonate for industrial use
HG/T 2959-2000 Hydrated basic magnesium carbonate for industrial use
HG/T 4519-2020 Basic cobaltous carbonate for industrial use
HG/T 4519-2013 Basic Cobaltous Carbonate
HG/T 6067-2022 Basic magnesium carbonate block for anti-skid in sport
HG/T 2523-2016 Basic zinc carbonate for industrial use
HG 2790-1996 Food Additives - Basic Magnesium Carbonate
HG 2181-1991 O-ring rubber materials for acid and alkali use
HG/T 4696-2020 Basic nickel carbonate for industrial use

Group Standards of the People's Republic of China

T/CAPDA 017-2021 Berberine sulfate soluble concentrate
T/ZZB 0682-2018 Acetyl L-carnitine hydrochlorate
T/CAPDA 016-2021 Berberine sulfate technical material
T/CI 315-2024 High iron phosphorus ratio iron phosphate
T/QGCML 4153-2024 Acid and alkali resistant polyester integral core flame retardant conveyor belt
T/CASME 721-2023 L-Carnitine fumarate
T/CCCMHPIE 1.85-2023 L-α-Glycerophosphoryl choline
T/CRIAC 0054-2021 Chemical reagent—Lead hydroxide carbonate
T/CRIAC 0061-2021 Chemical reagent—Lead hydroxide acetate
T/ZZB 0683-2018 L-carnitine fumarate
T/CASME 800-2023 Zinc carbonate hydroxide
T/CASME 720-2023 O-Acetyl-L-carnitine hydrochloride

Taiwan Provincial Standard of the People's Republic of China

CNS 12130-1987 Method of Test for Basic Lead Chromate Anticorrosive Paint
CNS 1560-1962 Ammonium Phosphate, Monobasic (Ammonium Dihydrogen Phosphate)
CNS 8987-1982 Chemical Reagent(Acidity and Alkalinity Determination)
CNS 12129-1987 Basic Lead Chromate Anticorrosive Paint
CNS 1777-1966 Lead Subacetate (Basic Lead Acetate for Sugar Analysis)
CNS 13987-1997 Method of test for corrosion of fine ceramics in acid and alkaline solutions
CNS 1628-1964 Calcium Phosphate, Dibasic
CNS 5874-1980 Basic Lead Silico - Chromate
CNS 26-1984 Sodium Carbonate (Soda Ash) for Industrial Use
CNS 5471-1980 Method of Test for pH Value of Paper and Paperboard
CNS 7720-1981 Aluminum Acetate, Basic
CNS 5867-1980 Blue Lead, Basic Sulfate

未注明发布机构

FORD M98B61-A-1991 SODA ASH (SODIUM CARBONATE)

Professional Standard-Safe Production

AQ 6102-2007 Acid ( Alkali ) resistance gloves

Professional Standard - Labor and Labor Safety

LD 34.2-1992(编制说明) Acid (Alkali) Resistant Gloves
LD 34.2-1992 Acid (Alkali) Resistant Gloves

National Health Commission of the People's Republic of China

WST 351:2011 alkaline phosphatase

Professional Standard - Agriculture

1838药典二部-2020 Papaverine Hydrochloride Part I Ten Drawings
232兽药产品说明书范本第一册-2013 Instructions for fourteen-draw polyalkaline bismuth bismuth carbonate tablets
231兽药产品说明书范本第一册-2013 Instructions for fourteen-stroke polyalkali carbon bismuth nitrate
1238药典化学药和生物制品卷-2010 Chapter 16 Sugars, Salts and Acid-base Balance Regulating Drugs 3. Acid-base Balance Regulating Drugs Sodium Lactate
1733药典二部-2010 Part I Twelve Draws of Vinblastine Sulfate
NY 399-2000 Feed grade betaine hydrochloride
1135药典二部-2010 The first part ten paintings berberine hydrochloride tablets
1368药典二部-2015 Part 10 Drawings of Berberine Hydrochloride
1134药典二部-2010 Part 10 Drawings of Berberine Hydrochloride
1241药典化学药和生物制品卷-2010 Chapter 16 Sugars, Salts and Acid-base Balance Regulators III. Acid-base Balance Regulators Citric Acid and Citrate
1237药典化学药和生物制品卷-2010 Chapter 16 Sugars, Salts and Acid-base Balance Regulators 3. Acid-base Balance Regulators Sodium Bicarbonate
1699药典二部-2015 Part 1 Ten Drawings of Ephedrine Hydrochloride
1480药典二部-2015 Part 1 Ten Drawings of Pseudoephedrine Hydrochloride
1435药典二部-2020 Part 10 Drawings of Berberine Hydrochloride
1383药典二部-2010 Part 1 Ten Drawings of Ephedrine Hydrochloride
1755药典二部-2015 Papaverine Hydrochloride Part I Ten Drawings
1240药典化学药和生物制品卷-2010 Chapter 16 Sugars, Salts and Acid-base Balance Regulating Drugs 3. Acid-base Balance Regulating Drugs Ammonium Chloride
1218药典二部-2010 Part 1 Ten Drawings of Pseudoephedrine Hydrochloride
NY/T 1746-2009 Determination of betaine in root of sugarbeet colorimetic method
1427药典二部-2010 Papaverine Hydrochloride Part I Ten Drawings
2105药典二部-2015 Part I Twelve Draws of Vinblastine Sulfate
1775药典二部-2020 Part 1 Ten Drawings of Ephedrine Hydrochloride

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

GB 4401-1984 Portable soda-acid fire extinguishers
GB/T 5211.13-1986 Determination of acidity or alkalinity of the aqueous extract of pigments
GB/T 1612-1988 Industrial hydrated basic magnesium carbonate
GB/T 23876-2009 Feed additive—L-carnitine hydrochloride

Professional Standard - Building Materials

JC/T 2628-2021 Classification of alkali aluminosilicate glass
JC/T 737-1986 Type I low pH value sulphoraluminate cement
JC/T 659-2003 Low alkalinity sulphoaluminate cement

Hebei Provincial Standard of the People's Republic of China

DB13/T 1233-2010 Method for Determination of Acidity (Acid Value) and Alkalinity of Chemical Products

Yunnan Provincial Standard of the People's Republic of China

DB53/T 918-2019 Determination of sulfuric acid content in ferric zinc sulfate solution by acid-base titration

Shandong Provincial Standard of the People's Republic of China

DB3705/T 10-2023 Technical regulations for the cultivation of wild jujube in saline-alkali soil

Professional Standard - Petrochemical Industry

SH/T 0407-1992 Petroleum wax water-soluble acid or alkali test method

Professional Standard - Energy

NB/SH/T 0407-2013 Water-soluble Acid or Alkali Test Method for Petroleum Wax

Military Standards (MIL-STD)

DOD A-A-50817 A-1988 COMPARATOR SET, COLOR CHLORINE-BROMINE AND PH DETERMINATION
MIL MIL-DTL-18618B-2016 Lead Carbonate, Basic, Dry (For Ordnance Use)
MIL MIL-STD-612B-1986 INORGANIC BASES AND BASIC ANHYDRIDES, TECHNICAL GRADE (METRIC) (S/S BY MIL-STD-612C)
MIL MIL-L-16355E-1993 LEAD STYPHNATE, BASIC (SUPERSEDING MIL-L-16355D)

Gosstandart of Russia

GOST R 52963-2008 Water. Methods for determination of alkalinity, and mass concentration of carbonates and hydrocarbonates
GOST 11840-1976 Reagents. Basic lead carbonate. Specifications
GOST 5898-1987 Confectionery. Methods for determination of acidity and alkalinity
GOST R 57780-2017 Plastics. Phenolic resins. Determination of pH
GOST EN 14178-1-2016 Alkaline earth silicate glass. Technical requirements
GOST 26743.5-1991 Caprolactam. Determination of acidity, alkalinity and pH of 20 percent aqueous solution of caprolactam
GOST 4466-1978 Reagents. Basic aqueous nickel (II) carbonate. Specifications

Yugoslav Association for Standardization

JUS H.C8.224-1989 Pigments. Basic zine ootassium chromate. Determination of water-soluble nitrate content (as NOJ. Colorimetric method
JUS H.C8.221-1989 Pigments- Basic zine potassium chromate. Determination of alkali metal content (as Ko0). Volumefric method
JUS H.C1.034-1989 Pigments- Basic zinc-potassium-chromate and zinc-tetrahvdroxvchromate. Technical requirements

Argentine Institute of Standardization

IRAM OFICIALIZADA 1009-1956 Alkaline lead carbonate
IRAM 5570-1955 How to measure acidity and alkalinity in soap

Bureau of Indian Standards

IS 14305-1995 Basic Lead Carbonate
IS 1420-1989 Specification for light basic magnesium carbonate
IS 1055-1984 Specification for Nicotine Sulfate Solution
IS 6301-2013 Basic Chromium Sulphate (for Tanning)
IS 1055-2023 Nicotine Sulfate Solution-Specification
IS 39-1979 Specification for basic lead sulfate for paints
IS 4501-1981 Specification for rubberized, acid and alkali resistant aprons
IS 6301-1971 Specification for basic chromium sulfate (for tanning)
IS 7362-1986 Tobias Acid Specification
IS 34-1975 Specification for basic lead carbonate (white lead) for paints

Korean Agency for Technology and Standards (KATS)

KS M 1417-2010(2025) Magnesium hydroxide carbonate
KS M 1417-2010(2020) Magnesium hydroxide carbonate
KS F 4708-2002 Basic magnesium carbonate heat insulating material
KS F 4708-1987 Basic magnesium carbonate heat insulating material
KS F 4708-2023 Basic magnesium carbonate heat insulating material
KS I ISO 9963-2-2008(2018) Water quality－Determination of alkalinity－Part 2：Determination of carbonate alkalinity
KS I ISO 9963-2:2008 Water quality-Determination of alkalinity-Part 2:Determination of carbonate alkalinity
KS I ISO 9963-2-2023 Water quality－Determination of alkalinity－Part 2：Determination of carbonate alkalinity
KS I ISO 9963-2-2008(2023) Water quality － Determination of alkalinity － Part 2: Determination of carbonate alkalinity
KS M 7053-1973(2002) TESTING METHOD FOR PH OF PAPER AND PAPERBOARD

Japanese Industrial Standards Committee (JISC)

JIS K 1452:1962 Sodium silicofluoride
JIS K 8165:1966 Aluminum acetate, basic
JIS K 8169:1961 Bismuth nitrate, basic
JIS K 8175:1961 Lead carbonate, basic
JIS K 8167:1961 Lead subacetate
JIS K 8178:1975 Magnesium carbonate, basic
JIS K 5624:2002 Basic lead chromate anticorrosive paint
JIS K 5624:1995 Basic lead chromate anticorrosive paint
JIS A 9506:1978 Basic magnesium carbonate heat insulating material
JIS K 0400-15-20:1998 Water quality -- Determination of alkalinity -- Part 2: Determination of carbonate alkalinity

Belgian Standards Institute

NBN 140-1951 association sans but iucratif nciennement Association Beige de Standardisation
NBN T 63-154-1983 Surface active agents - Technical alkane sulphonates - Determination of mean relative molecular mass of alkane monosulphonates
NBN 52.060-1958 Fatty acid alkalinity method NBN 52.060
NBN T 03-177-1980 Sodium sulphate for industrial use - Determination of acidity of alkalinity

GCC Standardization Organization

GSO 2350:2014 Determination of Glycoalkaloids (α-Solanine and α-Chaconine) in potato
GSO 1150:2002 SODIUM CARBONATE (SODA ASH) FOR INDUSTRIAL PURPOSES
GSO ISO 6122:2015 Surface active agents -- Technical alkane sulphonates -- Determination of total alkane sulphonates content
GSO ISO 9963-2:2013 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity
GSO ISO 6121:2015 Surface active agents -- Technical alkane sulfonates -- Determination of alkane monosulfonates content by direct two-phase titration
GSO 1151:2002 TEST METHODS FOR SODIUM CARBONATE (SODA ASH) FOR INDUSTRIAL PURPOSES

American Association of Textile Chemists and Colorists

AATCC 6-2001 Colorfastness to Acids and Alkalis
AATCC 6-2016 Colorfastness to Acids and Alkalis
AATCC 6-2006 Colorfastness to Acids and Alkalis
AATCC 6-2011 Colorfastness to Acids and Alkalis (Reaffirmed)
AATCC TM6-2021 Acid and alkali fastness test method

Polski Komitet Normalizacyjny (PKN)

PN BN 6016-09-1966 Alkaline. Lead bisulfate
PN C80560-1955 REAGENTS BASIC NICKEL CARBONATE
PN BN 6191-09-1964 Testing agent. Basic magnesium carbonate
PN BN 6191-52-1965 Testing agent. Basic copper sulfate
PN P04987-1989 Textiles for acidproof and alcaliproof clothes Requirements
PN C04540-05-1991 "Watcr and waste water Tests for pH, acidity and alkalinily Determination of pH, minera! and total acidity and alkalinity m sludges of urban wastc waters

Türk Standardları Enstitüsü

TS 885-1970 DETERMINATION OF ALKAL? SOLUBILITY RATES ON WOOL

Ente Nazionale Italiano di Unificazione

UNI EN ISO 9963-2:1998 Water quality - Determination of alkalinity - Determination of carbonate alkalinity

U.S. Military Regulations and Norms

ARMY MIL-Z-12061 B-1983 ZINC CARBONATE, BASIC, TECHNICAL
ARMY MIL-Z-12061 B VALID NOTICE 3-2004 ZINC CARBONATE, BASIC, TECHNICAL
ARMY MIL-Z-12061 B NOTICE 2-1996 ZINC CARBONATE, BASIC, TECHNICAL

Czech Standards Institute (UNMZ)

CSN 68 4600-1975 Ammonium phosplmte monobasic
CSN 66 4112-1961 Ephedrine hydroohloride for phanuaceutic use
CSN 65 6299-1975 Determination of pH alue of emulsion
CSN 65 6315-1953 Free acid and free base content
CSN ON 71 4027-1967 Glass. Alkaline magnesia lime. silicate
CSN 65 2025-1962 Testíng of technical alkali carbonates
CSN ON 67 5351-1964 Alkali and acid proof chlonnated rubber enamel
CSN 68 4065-1983 Pure chemicals. Preparation of measuring solutions for acid-base titrations
CSN 07 8626-1987 Closing valves yoke - type for cylinders for acetylene. Dimensions

Standards Institution of Israel

S.I.T.D.649-1967 ALKALI SILICATE SOLUTIONS

British Standards Institution (BSI)

BS EN ISO 9963-2:1996 Water quality. Determination of alkalinity. Determination of carbonate alkalinity
BS ISO 3356:2009 Milk - Determination of alkaline phosphatase
BS EN ISO 9917-1:2025 Dentistry. Water-based cements - Acid-base cements
BS EN ISO 9963-2:1996(2008)*BS 6068-2.52:1996 Water quality — Determination of alkalinity — Part 2 : Determination of carbonate alkalinity

American Society for Testing and Materials (ASTM)

ASTM D1648-86(2003) Standard Specification for Basic Lead Silicochromate Pigment
ASTM UOP430-70T Basic Nitrogen in Gases by Acid Scrubbing
ASTM D81-87(2003) Standard Specification for Basic Carbonate White Lead Pigment
ASTM D4988-96(2006) Standard Test Method for Determination of Alkalinity of Paper as Calcium Carbonate (Alkaline Reserve of Paper)
ASTM D4988-96 Standard Test Method for Determination of Alkalinity of Paper as Calcium Carbonate (Alkaline Reserve of Paper)
ASTM UOP743-73T Acid Oils in Refinery Caustic by Liberation
ASTM UOP315-59 Basic Nitrogen in Gases by Low Temperature Acid Scrubbing
ASTM D4988-96(2001) Standard Test Method for Determination of Alkalinity of Paper as Calcium Carbonate (Alkaline Reserve of Paper)

Magyar Szabványügyi Testület

MSZ 3048/8-1979 Rubber hose acid, alkali hose
MSZ 9691/5-1982 rubber tube. Acid and alkali tubes
MSZ 20906-1984 Alkalinity of cellulose nitrate
MNOSZ 9548-1954 Bitter alkaline acids for analysis (for analysis)
MSZ 260/5-1971 Detection of alkalinity and acidity in wastewater
MSZ 18847-1961 Valve springs containing magnetic cores for acids, alkalis and foods

National Standardisation Body (ASRO)

STAS 6363-1976 DRINKING WATER Determination of alkalinity and acidity
STAS 723/16-1977 LEATHERS Determination of acids and of the total basic capacity
STAS 194/15-1969 Soap. Determination of alkali phosphates
STAS 194/8-1969 Soap. Strong alkaline determination of carbonation
STAS 2213/8-1987 SWEET PRODUCTS Acidity and alcalinity determination

The Directorate General of Specifications and Metrology (DGSM)

OS GSO 1150:2002 SODIUM CARBONATE (SODA ASH) FOR INDUSTRIAL PURPOSES
OS GSO ISO 9963-2:2013 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity
OS GSO ISO 3356:2010 Milk -- Determination of alkaline phosphatase

Association Francaise de Normalisation

NF U43-106:1981 Agropharmaceutical products. Chemical analysis of nicotine and nicotine sulphate.
NF T90-051*NF EN ISO 9963-2:1996 Water quality - Determination of alkalinity - Part 2 : determination of carbonate alkalinity.
NF T20-457:1976 Sodium sulphate for industrial use. Determination of acidity or alkalinity.
JIS K 8878:2020 Malachite green oxalate (Reagent)
NF EN ISO 9963-2:1996 Water quality - Determination of alkalinity - Part 2: determination of carbonate alkalinity
NF ISO 3356:2009 Milk - Determination of alkaline phosphatase
NF V04-151*NF ISO 3356:2009 Milk - Determination of alkaline phosphatase.
NF EN 14178-1:2005 Glass in Construction - Basic Alkaline Earth Silicate Glass - Part 1: Float Ice
NF EN 14178-2:2005 Glass in construction - Basic alkaline earth silicate glass - Part 2: conformity assessment

Canadian General Standards Board （CGSB)

CAN/CGSB-1.167-M90-1990 Exterior Basic Lead Silicochromate Enamel, Alkyd Type
CAN/CGSB-1.166-M90-1990 Primer paint, basic lead silicochromate, oleoglycerophthalic type

International Organization for Standardization (ISO)

ISO 23774:2023 Pulps — Kraft liquor — Determination of total, active and effective alkali using potentiometric titration
ISO 3240:1975 Sodium sulphate for industrial use; Determination of acidity or alkalinity
ISO 3356:2009|IDF 63:2009 Determination of milk alkaline phosphatase
ISO 3356:2009 Milk - Determination of alkaline phosphatase
ISO 3356:2009 | IDF 63:2009 Milk — Determination of alkaline phosphatase
ISO 9963-2:1994 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity

German Institute for Standardization

DIN EN ISO 9963-2:1996 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity (ISO 9963-2:1994); German version EN ISO 9963-2:1995

Danish Standards Foundation

DANSK DS/EN ISO 9963-2:1996 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity
DS/EN ISO 9963-2:1996 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity
DANSK DS/EN 14178-1:2004 Glass in building - Basic alkaline earth silicate glass - Part 1: Float glass

Spanish Association for Standardization (UNE)

UNE 30134:1960 ANALYSIS REAGENTS. LEAD BASIC ACETATE.
UNE 30130:1960 ANALYSIS REAGENTS. LEAD BASIC CARBONATE.
AENOR UNE 48039:1956 BASIC LEAD SULFATE. CHARACTERISTICS AND TEST METHODS

Portuguese Institute of Quality

NP 1279-1976 Sodium silicate and potassium silicate. Measurement of total alkalinity

Universal Oil Products Company (UOP)

UOP 743-73T UOP Method 743-73T

Standard Association of Australia （SAA）

AS 3550.3:1992 Waters - Determination of alkalinity - Acidimetric titration method
AS 2449:1981 Waters - Determination of alkalinity - Acidimetric titration method

Indonesia Standards

SNI 12-4926.1-1998 Silicate lime soda glass tableware
SNI 04-2005-1990 Water for lead acid batteries and alkaline batteries

Thai Industrial Standards Institute (TISI)

TIS 726-1987 Standard for basic chromium sulphate (for tanning)

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

TCVN 6636-2-2000 Water quality.Determination of alkalinity.Part 2: Determination of carbonate alkalinity
TCVN 2739-1986 Pesticides.Method for determination of acid and base contents

United States Navy

NAVY O-S-639 B-1984 SODIUM PHOSPHATE, DIBASIC, ANHYDROUS, TECHNICAL

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ISO 3356:2015 Milk -- Determination of alkaline phosphatase
BH GSO ISO 9963-2:2016 Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity

Society of Automotive Engineers (SAE)

SAE AMS1380B Scale Conditioner, Alkaline, Aircraft Turbine Engine Components
SAE AMS1380A-1992 Scale Conditioner, Alkaline Aircraft Turbine Engine Components
SAE AMS1380 Scale Conditioner, Alkaline Aircraft Turbine Engine Components
SAE AMS1380A Scale Conditioner, Alkaline Aircraft Turbine Engine Components

Tunisia Institut National de la Normalisation et de la Propriété Industrielle

NT 14.41-1983 Testing for alkaline phosphatase in milk

GM North America

GM 9986022-1995 Hollow Ceramic Microspheres, (Alkali Aluminum Silicate)

American National Standards Institute （ANSI)

ANSI/ASTM D548:1997 Test Method for Water-Soluble Acidity or Alkalinity of Paper

Netherlands Institute for Standardization

NEN 6587-1990 Rainwater - Determination of the consumption of acid or base