Electrochemistry Buffers

Buffer solutions suitable for use as reference and calibration standards for measuring pH values.

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Thermo Scientific™ Orion™ pH Buffer Bottles

Perform accurate, reproducible pH calibrations with these color-coded buffer bottles.

Pricing and Availability
Specifications

For Use With (Equipment)	pH Meter and Electrode
Traceability to NIST	Yes
Physical Form	Liquid
Chemical Name or Material	pH Buffer, bottles

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Thermo Scientific™ Orion™ pH Buffer Individual Use Pouches

Orion™ single-use pH calibration buffers deliver NIST-traceable accuracy for pH meters and electrodes. Designed for GxP labs, these ready-to-use, color-coded buffer pouches support compliant workflows, reduce contamination risk and ensure reliable, traceable pH calibration results.

Pricing and Availability
Specifications

Boiling Point	100°C
For Use With (Equipment)	pH Meter and Electrode, single-use
Solubility Information	Soluble
Traceability to NIST	Yes
Packaging	Pouch
Physical Form	Liquid
Chemical Name or Material	pH Buffer, individual use pouches
For Use With (Application)	pH calibration
Solution Type	Buffer

Buffer Solution pH7.00 (Phosphate), NIST Standard Solution ready to use for pH measurement, Fisher Chemical™

MDL Number: 217672

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Specifications

MDL Number	217672

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Buffer Solution pH4.00 (Phthalate), NIST Standard Solution ready to use for pH measurement, Fisher Chemical™

MDL Number: 217672

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Specifications

MDL Number	217672

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Technical pH Buffer Solutions, METTLER TOLEDO™

Provides a reliable all-around pH buffer. Mettler Toledo™ Technical pH Buffer Solution are specified to two decimal places and are traceable to NIST standards. Color-coded solution comes in a handy 250mL plastic bottle with no-fuss labels.

Pricing and Availability
Specifications

For Use With (Equipment)	pH Electrode
Traceability to NIST	Yes
Quantity	250 mL
Grade	Technical
For Use With (Application)	pH measurement, electrode calibration

Buffer solution pH 7, Phosphate buffer, traceable to NIST, ready to use

CAS: 7558-79-4

Pricing and Availability
Specifications

Name Note	Phosphate buffer, traceable to NIST, ready to use
CAS	7647-14-5
MDL Number	MFCD03097944
Solubility Information	Solubility in water: miscible.
Chemical Name or Material	Buffer solution pH 7
Density	1.0000g/mL
Specific Gravity	1

Buffer Solution pH6.00 (Phosphate), NIST Standard Solution ready to use for pH measurement, Fisher Chemical™

Buffer Solution pH6.00 (Phosphate), NIST Standard Solution ready to use for pH measurement, Fisher Chemical, Quantity: 1L, CAS: 7778-77-0, Colorless, Packaging: HDPE plastic bottle, pH: 6, MDL Number: 81857, Physical Form: Liquid

Pricing and Availability
Specifications

CAS	7778-77-0
Color	Colorless
Packaging	HDPE plastic bottle
Physical Form	Liquid
pH	6

Buffer solution pH 4, Citrate buffer

CAS: 68-04-2 | C₈H₅KO₄

Pricing and Availability
Specifications

Name Note	Phthalate buffer
CAS	7732-18-5
MDL Number	MFCD00130806
Color	Colorless
Traceability to NIST	Traceable to NIST
Packaging	Plastic bottle
Physical Form	Liquid
pH	3.98 to 4.02 (20°C)
Chemical Name or Material	Buffer solution pH 4
Molecular Formula	C₈H₅KO₄
Formula Weight	204.23

CAS	7732-18-5
Color	Colorless
Packaging	Plastic bottle
Physical Form	Liquid
pH	9.98 to 10.02 (20°C)
Health Hazard 1
Chemical Name or Material	Buffer solution pH 10

Technical Buffer Solution pH 7.00, Mettler Toledo™

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Buffer solution pH 4.01 (+/-0.022 @ 25oC) No Color Specpure NIST Traceable

CAS: 1336-21-6 | H5NO | 35.05 g/mol

Pricing and Availability
Specifications

Molecular Weight (g/mol)	35.05
ChEBI	CHEBI:18219
Color	Colorless
Physical Form	Liquid
Chemical Name or Material	Buffer solution
SMILES	N.O
InChI Key	VHUUQVKOLVNVRT-UHFFFAOYSA-N
Vapor Pressure	23 hPa (17mm Hg) at 20°C
PubChem CID	14923
MDL Number	MFCD00066650
Solubility Information	Miscible with water.
TSCA	Yes
Recommended Storage	Ambient temperatures
IUPAC Name	azanium;hydroxide
Molecular Formula	H5NO
Odor	Odorless

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Technical pH Buffer Solution, pH 9.21, Mettler Toledo™

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Potassium phosphate, monobasic, for HPLC

CAS: 7778-77-0 Molecular Formula: H2KO4P Molecular Weight (g/mol): 136.08 MDL Number: MFCD00011401 MFCD00147253 InChI Key: GNSKLFRGEWLPPA-UHFFFAOYSA-M IUPAC Name: potassium dihydrogen phosphate SMILES: [K+].OP(O)([O-])=O

Pricing and Availability
Specifications

CAS	7778-77-0
Molecular Weight (g/mol)	136.08
MDL Number	MFCD00011401 MFCD00147253
SMILES	[K+].OP(O)([O-])=O
IUPAC Name	potassium dihydrogen phosphate
InChI Key	GNSKLFRGEWLPPA-UHFFFAOYSA-M
Molecular Formula	H2KO4P

Thermo Scientific Chemicals Sodium borate, 0.5M buffer soln., pH 8.5

CAS: 1330-43-4 Molecular Formula: B4Na2O7 Molecular Weight (g/mol): 201.21 MDL Number: MFCD00081185 InChI Key: NXSVMNYRVBQCMO-UHFFFAOYSA-N IUPAC Name: disodium bicyclo[3.3.1]tetraboroxane-3,7-bis(ylium)-1,5-diuide-1,5-bis(olate) SMILES: [Na+].[Na+].[O-][B-]12O[B+]O[B-]([O-])(O[B+]O1)O2

Pricing and Availability
Specifications

CAS	1330-43-4
Molecular Weight (g/mol)	201.21
MDL Number	MFCD00081185
SMILES	[Na+].[Na+].[O-][B-]12O[B+]O[B-]([O-])(O[B+]O1)O2
IUPAC Name	disodium bicyclo[3.3.1]tetraboroxane-3,7-bis(ylium)-1,5-diuide-1,5-bis(olate)
InChI Key	NXSVMNYRVBQCMO-UHFFFAOYSA-N
Molecular Formula	B4Na2O7

Buffer solution, pH 2.00 (+/-0.026 @ 25oC), No Color, Specpure, NIST Traceable

For Calibration of pH Meters | CAS: 7447-40-7

Pricing and Availability
Specifications

Color	Colorless
Traceability to NIST	Yes
Physical Form	Liquid
Chemical Name or Material	Buffer solution
Vapor Pressure	23 hPa (17mm Hg) at 20°C
Concentration or Composition (by Analyte or Components)	Potassium chloride: 0.7%; Hydrochloric acid: 0.7%; water: 98.6%
CAS	7732-18-5
Health Hazard 3	P234-P390
MDL Number	MFCD00146252
Health Hazard 2	In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable gloves and eye/face protection. This material and/or its container must be disposed of as hazardous waste.
Solubility Information	Soluble in water.
Health Hazard 1	H290
TSCA	Yes
Recommended Storage	Ambient temperatures

Electrochemistry Buffers

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Technical pH Buffer Solutions, METTLER TOLEDO™ Greener Choice ProductThis product offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More About the Greener Choice Program

Technical Buffer Solution pH 7.00, Mettler Toledo™ Greener Choice ProductThis product offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More About the Greener Choice Program

Technical pH Buffer Solution, pH 9.21, Mettler Toledo™ Greener Choice ProductThis product offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More About the Greener Choice Program

Potassium phosphate, monobasic, for HPLC Greener Choice ProductThis product offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More About the Greener Choice Program

Technical pH Buffer Solutions, METTLER TOLEDO™

Technical Buffer Solution pH 7.00, Mettler Toledo™

Technical pH Buffer Solution, pH 9.21, Mettler Toledo™

Potassium phosphate, monobasic, for HPLC