Buffer, Precision Reference Standard, pH 6.000 ± 0.010 25°C - pH 6.000 ± 0.010(25℃)

Cat. No.: H298607

GRADE & PURITY pH 6.000 ± 0.010(25℃)

Storage

Room temperature

Shipped In

Normal

Specifications

Especificaciones y pureza

pH 6.000 ± 0.010(25℃)

Condiciones de almacenamiento de almacenamiento

Room temperature

Enviado en

Normal

Application Protocols

No assay-specific protocols (e.g., WB, IHC, IF, FC) are applicable to this product. It is used for instrument calibration rather than bioassays.

General calibration workflow (guidance)

• Preparation: Bring the pH 6 standard, other calibration standards (e.g., pH 4 and 7), and the electrode to 25°C. Inspect for cleanliness and expiration.
• Rinse: Flush electrode with deionized water; blot gently with lint-free tissue.
• Calibrate: Immerse in the first standard (commonly pH 7), wait for stabilization, accept point; repeat with pH 6 (this product) and then pH 4 if performing a three-point calibration.
• Verify: Re-measure the first standard to check for drift; record slope and offset.
• Documentation: Record lot numbers, expiration dates, temperature, and instrument ID.

Parameters like recommended dilutions or antibody-specific settings do not apply to this item.

Biological Roles

Not directly applicable. This product is a formulated aqueous reference solution for pH calibration, not a biomolecule and not intended to participate in biological pathways.

General context (for users working with biological systems)

• Many biological matrices (enzyme assays, protein formulations, microbiological media) exhibit sensitivity to pH near neutrality. A pH 6 reference standard helps verify the accuracy of pH meters used to prepare and monitor such systems.
• If biological compatibility is required for downstream use, prepare application-specific buffers (e.g., citrate, MES, or phosphate systems around pH 6, literature options) using biocompatible, sterile components. This calibration standard itself is for measurement verification, not for direct use in biological experiments.

No cellular targets, receptors, enzymes, or pathways are associated with this calibration product.

Buffer Applications

Intended role

• This is a ready-to-use pH 6.000 ± 0.010 (25°C) reference buffer for calibrating pH meters and verifying electrode performance. It is not designed as a process buffer for sample preparation or biochemical reactions.

Good laboratory practice

• Use in two- or three-point calibrations bracketing the expected sample pH. Typical sequence: neutral (pH 7) → mildly acidic (pH 6) → acidic (pH 4), with thorough rinsing between standards to avoid cross-contamination.
• Equilibrate the buffer and electrode to 25°C to meet the stated tolerance. Employ ATC (automatic temperature compensation) when available.
• Minimize atmospheric CO2 uptake: dispense small aliquots into a beaker with minimal surface area and recap the stock bottle promptly.

Literature buffer system examples at pH ~6 (for preparing application-specific buffers; not item-specific)

• Citrate buffer: Citric acid/tri-sodium citrate; useful range pH 3–6.2. Recipes depend on concentration and desired ionic strength.
• MES buffer: 2-(N-morpholino)ethanesulfonic acid; pKa ~6.1 at 25°C; useful range pH 5.5–6.7.
• Phosphate buffer: Dihydrogen/hydrogen phosphate pair can be adjusted near pH 6, though buffer capacity peaks nearer pH 7.2.

Note

• Exact composition, molarity, and ionic strength of this reference standard are Not specified for this item; refer to CoA/Spec Sheet. Do not assume interchangeability with a process buffer recipe.

Green Alternatives

Context

• As a water-based calibration solution, this product is already aligned with green chemistry principles: aqueous solvent, minimal volatility, and low inherent hazard relative to many organic solvents. Environmental impact mainly arises from packaging, transportation, and waste handling.

Best practices to improve sustainability

• Use aliquots sized to your calibration frequency to reduce spoilage and disposal of aged material.
• Choose packaging sizes that match consumption rates to minimize expired waste.
• Reuse clean secondary containers (where allowed) and recycle primary packaging per local regulations.
• Implement multipoint calibrations efficiently (e.g., sequence pH 7 → 6 → 4) to minimize rinses and water use.

Comparison to alternatives (general, not item-specific)

• Dry buffer capsules/powders: Reduce shipping weight and extend shelf life but require accurate reconstitution with CO2-free water; risk of user-introduced error. Suitable when logistics favor solids.
• Concentrated buffer concentrates: Lower packaging and transport footprint; however, require precise dilution and may be more susceptible to errors if laboratory water quality is variable.
• Ready-to-use standards (this item type): Highest convenience and lowest user error; slightly higher shipping weight per unit of calibration due to water content.

Trade-offs

• Ready-to-use solutions minimize calibration uncertainty and time but generate more liquid waste. Solid/concentrate formats can be greener if reconstitution is tightly controlled with validated water quality and calibrated volumetry.

Pharmaceutical Uses

Scope

• This product is for research and laboratory use only. It is intended for calibration and verification of pH measurement devices used in development, QC, and method validation contexts. No medical or clinical uses are claimed or supported.

Typical roles in regulated labs (general)

• Instrument calibration: Routine standard for pH meters and autotitrators supporting pharmacopeial assays and release testing.
• System suitability and method validation: Establishing accuracy/precision of pH measurements within analytical methods for raw materials, intermediates, and finished products.
• Equipment qualification: IQ/OQ/PQ activities where a defined pH standard near 6.0 is needed to demonstrate performance.

Documentation and compliance

• Traceability, uncertainty, and conformity to specific pharmacopeial requirements (e.g., compendial reference standards) are lot- and supplier-specific. For this item, such details are Not specified for this item; refer to CoA/Spec Sheet.
• Maintain calibration records, lot numbers, expiration dates, and CoAs as part of your data integrity program.

Handling considerations in GMP environments

• Use dedicated, single-use aliquots to prevent contamination.
• Verify temperature at point of use (25°C recommended) or apply certified temperature corrections if provided in the CoA.

Reminder

• This product is not an excipient and is not intended for formulation into drug products.

Physical Properties

Item-specific data provided

• Target pH: 6.000 ± 0.010 at 25°C (from Product Data)
• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Density, refractive index, conductivity, ionic strength: Not specified for this item; refer to CoA/Spec Sheet.

General/literature characteristics for pH calibration buffers (context, not item-specific)

• Physical state: Clear, colorless aqueous solution is typical.
• Temperature dependence: pH of buffers is temperature-dependent; indicated tolerance applies at 25°C. Calibrate meters with ATC enabled or equilibrate solutions to the stated temperature to maintain the ±0.010 specification.
• Buffer capacity: Determined by total buffer concentration and pKa proximity to pH 6; exact capacity is formulation-specific (not provided for this item).
• Solubility: Fully miscible with water (aqueous base matrix, literature expectation).

Use implications

• For best reproducibility, allow the buffer and electrode to equilibrate to 25.0°C before calibration.
• Minimize CO2 absorption from air (which can slowly acidify open aqueous buffers) by keeping the bottle tightly capped and limiting headspace exposure during use.

Do not treat the above generalities as specifications. For numerical values beyond the stated pH and tolerance, consult the lot-specific CoA/Spec Sheet.

Quality and Grades

Item-specific quality information

• Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet.
• Traceability (e.g., to national metrology institutes): Not specified for this item; refer to CoA/Spec Sheet.

What “Precision Reference Standard” typically implies (general guidance)

• Tight tolerance: The stated pH 6.000 ± 0.010 at 25°C indicates a narrowly controlled composition suitable for calibration of pH meters and verification of measurement uncertainty in QA/QC environments.
• Lot certification: High-quality buffer standards are commonly supplied with a certificate indicating the certified value at specific temperatures, estimated uncertainty, and the measurement method. Confirm details in the CoA for this item.
• Matrix and cleanliness: Low ionic and organic contamination help ensure electrode response accuracy and low drift. Stabilizers, if used, should not interfere with pH or conductivity; presence/absence is not specified for this item.

Best practices to realize the specified tolerance

• Temperature control: Use at 25.0°C or apply temperature compensation as directed by your instrument manufacturer.
• Handling: Pour small working aliquots to minimize CO2 ingress and particulate contamination; discard used aliquots.
• Electrode maintenance: Calibrate with clean, hydrated electrodes. Fouled or dehydrated glass membranes can broaden apparent uncertainty beyond the solution’s certified tolerance.

Documentation

• For regulatory or audit contexts (GxP/ISO), retain the lot CoA and any traceability statements. If you require NIST or equivalent traceability, verify this explicitly on the CoA/Spec Sheet for the purchased lot.

Reaction and Applications

Primary application domain

• Calibration and verification of pH measurement systems (benchtop meters, portable meters, titrators, process probes) at a defined mildly acidic point.

Typical laboratory uses

• Two-/three-point calibration in analytical chemistry workflows to improve accuracy and reduce slope/offset errors.
• Instrument qualification (IQ/OQ/PQ) and routine QA/QC verification where a certified pH near 6.0 is required.
• Method development: Establishing pH-dependent response curves (e.g., ion-selective electrodes, spectrophotometric pH indicators) with a reliable reference point.
• Teaching labs: Demonstrating temperature effects on pH and electrode Nernstian response using a standard with known value at 25°C.

Practical tips

• Equilibrate buffer, electrode, and sample to the same temperature (ideally 25.0°C) to honor the ±0.010 specification.
• Rinse electrode with deionized water and gently blot dry between standards to avoid carryover and dilution.
• Use fresh aliquots for each calibration session; avoid returning used solution to the stock bottle.
• Verify electrode slope: A well-functioning glass electrode exhibits ~59.16 mV/decade at 25°C (literature, Nernst equation). Slopes outside ~95–105% of theoretical suggest maintenance or replacement.

Not a reaction solvent or reagent

• This product is not intended as a reactant or process buffer for synthesis. If a pH 6 environment is needed for chemical reactions, prepare a dedicated buffer system appropriate for your chemistry, using analytical-grade reagents and validated recipes (see Buffer Applications for general guidance).

Reaction Conditions

This product is not intended to serve as a reaction medium. Nevertheless, understanding pH measurement behavior supports robust experimental conditions.

Measurement-centric conditions (general, literature-based)

• Temperature: Electrode response follows the Nernst equation; theoretical slope is 59.16 mV/decade at 25°C, scaling with absolute temperature (≈2.303·RT/F). Calibrate at 25°C to match the stated pH 6.000 ± 0.010.
• Equilibration: Allow 1–3 minutes for electrode stabilization in the buffer; gently stir to reduce boundary layer effects without introducing air bubbles.
• Rinsing: Use high-purity water between standards; blot (do not wipe) to avoid developing static potentials on the glass membrane.
• Sequence: Calibrate from neutral toward acidic or basic standards to minimize drift; re-check the first standard at the end to assess stability.

Expected performance benchmarks (literature guidance)

• Slope: 95–105% of theoretical is typical for a healthy probe.
• Offset: Reading in a pH 7.00 standard should be 7.00 ± instrument specification; confirm after calibration.

Caveats

• Ionic strength and buffer composition influence junction potentials and response time. The exact ionic strength of this item is Not specified for this item; refer to CoA/Spec Sheet.
• For non-aqueous or high-ionic-strength systems, specialized electrodes and calibration matrices may be required; do not assume transferability from aqueous calibration without verification.

Safety and Handling

GHS/SDS status

• Signal word: Not specified for this item; refer to SDS.
• Hazard statements (H-phrases): Not specified for this item; refer to SDS.
• GHS classification and pictograms: Not specified for this item; refer to SDS.

General laboratory precautions (good practice for aqueous buffer standards)

• PPE: Wear lab coat, safety glasses, and appropriate disposable gloves when handling to avoid contamination of the reference solution and contact with skin/eyes.
• Hygiene: Avoid pipetting by mouth; wash hands after handling. Do not ingest.
• Handling: Use clean, dedicated vessels or single-use aliquots to prevent cross-contamination that can shift pH. Do not return used portions to the original container.
• Incompatibilities: Avoid contact with reactive acids/bases and strong oxidizers. Prevent evaporation and CO2 uptake; keep container tightly closed when not in use.
• First aid (overview; consult SDS for details):
  • Eye contact: Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do; continue rinsing. Seek medical advice if irritation persists.
  • Skin contact: Wash with soap and water; remove contaminated clothing.
  • Ingestion: Rinse mouth; seek medical attention as needed.
  • Inhalation: Not a typical route of exposure for aqueous solutions; move to fresh air if aerosol/mist is generated and causes irritation.

Spill/Disposal

• Small spills: Wipe up with absorbent material and rinse area with water.
• Waste: Dispose according to institutional and local regulations for aqueous, non-hazardous laboratory solutions unless SDS indicates otherwise.

Always refer to the official SDS for authoritative hazard, exposure, and response information.

Solvent Selection

Applicability

• This product is an aqueous buffer reference solution; selection of an external solvent is not relevant. Instead, consider compatibility of your measurement system with an aqueous matrix and the pH 6 environment.

Key characteristics (general)

• Polarity: Highly polar (water-based). Miscible with water; immiscible with most nonpolar solvents.
• Ionic environment: Contains a conjugate acid/base pair at defined concentrations; ionic strength influences electrode response time and stability. Exact ionic strength: Not specified for this item; refer to CoA/Spec Sheet.

Instrument considerations

• pH electrodes: Standard glass electrodes and reference systems are optimal in aqueous media. Low-ionic-strength samples may require specialized electrodes; confirm with your instrument vendor.
• Temperature: The certified value applies at 25°C. If calibrating at other temperatures, use a buffer whose certificate provides pH vs temperature data, or equilibrate to 25°C.

When to choose pH 6 buffer vs alternatives (general)

• Choose pH 6 for calibrations bracketing mildly acidic analytical samples (approx. pH 5–7). Pair with a near-neutral buffer (e.g., pH 7) and an acidic buffer (e.g., pH 4) for two- or three-point calibrations spanning your measurement range (literature best practice).

Comparison (contextual, not item-specific)

• pH 4 buffer: Stronger acidity; use for beverages, environmental acids.
• pH 6 buffer: Mildly acidic; useful for biological and food matrices near neutrality.
• pH 7 buffer: Neutral reference; often used as a midpoint in multipoint calibrations.

Storage and Reconstitution

Storage

• Storage conditions: Room temperature (per Product Data). Avoid temperature extremes and direct sunlight.
• Shipped in: Normal conditions (per Product Data).
• Container care: Keep tightly closed to minimize evaporation and CO2 absorption, which can alter pH over time.
• Shelf life/expiration: Not specified for this item; refer to CoA/Spec Sheet.

Reconstitution

• Not applicable. pH reference standards are typically supplied ready-to-use. For this item, any need for dilution or preparation is Not specified for this item; refer to CoA/Spec Sheet.

Handling recommendations

• Dispense small working aliquots; never return used portions to the stock bottle.
• Rinse caps/necks if salt crystallization or residue is observed; dry before recapping to maintain seal integrity.
• Record the opening date and track usage to replace the bottle in alignment with your laboratory’s policy or the product’s stated expiry.

Compatibility and stability notes

• Avoid contamination with acids, bases, detergents, or organics that can shift pH or foul electrodes.
• If precipitate or turbidity is observed, or if readings deviate from certificate values, discontinue use and verify against a fresh lot or alternative standard.

For authoritative instructions on storage limits, stability claims, and disposal, consult the lot-specific CoA and the SDS.

Structure and Identity

This product is an aqueous buffer reference solution formulated to deliver a defined hydrogen ion activity for instrument calibration.

• Item: Buffer, Precision Reference Standard, pH 6.000 ± 0.010 at 25°C (SKU: H298607)
• Nature of material: Aqueous buffer solution (mixture/solution), not a single defined chemical compound.
• Molecular formula: Not applicable to mixtures; Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not applicable to mixtures; Not specified for this item; refer to CoA/Spec Sheet.
• SMILES / InChIKey: Not applicable for mixtures; Not specified for this item; refer to CoA/Spec Sheet.
• Structural features: The functionality derives from a conjugate acid/base pair in water providing a stable pH near 6. Exact buffer components are not disclosed in the Product Data.
• 2D structural description (general): An aqueous phase containing a weak acid HA and its conjugate base A− at a defined ratio, establishing pH via the Henderson–Hasselbalch relationship (general literature concept).

Notes

• Because this is a formulated reference standard rather than a pure substance, conventional identifiers (CAS, SMILES) are typically not assigned. If traceability, exact composition, or ionic strength are required, consult the Certificate of Analysis (CoA) for the specific lot.

Synthetic Utility

Direct synthetic roles are limited because this is a calibration standard rather than a reagent. However, precise pH control is foundational to many synthetic and analytical workflows, and this standard can indirectly enhance outcomes by ensuring accurate pH measurement.

Use-adjacent value in synthesis and analysis

• Acid/base-sensitive steps: Verify pH meter accuracy before preparing workup solutions (e.g., quench solutions, buffer washes) where pH near 6 influences extraction profiles or product stability.
• Chromatography: Confirm pH meter performance prior to preparing mobile phases or sample diluents targeting mildly acidic conditions (e.g., pH ~6) to ensure retention time reproducibility and analyte stability.
• Titrations: Validate titrator pH channels when standardizing acids/bases or determining pKa values near 6.

General literature context

• Buffer systems around pH 6 often involve citrate, MES, or mildly adjusted phosphate, chosen based on compatibility with substrates or metals. Selection depends on coordination tendencies, ionic strength, and downstream detection.

Limitations

• Do not substitute this calibration standard as a reaction buffer unless the composition meets your compatibility needs. Composition, molarity, and potential counterions are Not specified for this item; refer to CoA/Spec Sheet if considering atypical uses.

Target Specificity

Not applicable. This product is a chemical reference solution and does not target biological epitopes, analytes, or organisms. No antigen, clone, isotype, or species reactivity data are relevant.