Acetate Buffer, pH 4.5, for Cyanide Determination - pH 4.5

Cat. No.: A298629

GRADE & PURITY pH 4.5

Storage

Room temperature

Shipped In

Normal

Specifications

Specifications & Purity

pH 4.5

Storage

Room temperature

Shipped In

Normal

Application Protocols

No vendor-validated assay protocols are provided for this specific item in the Product Data. Refer to your laboratory’s standard operating procedures or to recognized cyanide determination methods that call for an acetate buffer at pH 4.5.

• General guidance
  • Verify pH at use temperature; equilibrate the buffer if temperature differs from calibration conditions.
  • Use clean, dedicated glassware; run reagent blanks.
  • For colorimetric or electrochemical cyanide methods that specify an acetate buffer stage, follow the prescribed volumes, order of addition, and timing exactly.

For composition/volume instructions specific to this catalog item, consult the CoA/Spec Sheet.

Biological Roles

While this product is intended for analytical chemistry, understanding acetate’s biological context can aid in assay planning and matrix considerations.

• General biochemical roles (literature)
  • Acetate is a central short-chain carboxylate in metabolism; converted to acetyl-CoA and enters the TCA cycle and biosynthetic pathways.
  • Acetic acid/acetate buffers are commonly used to maintain pH in the mildly acidic range required for certain enzymes and to stabilize biomolecules.
• Implications for analytical work
  • In biological samples, endogenous acetate typically occurs at low millimolar or sub-millimolar levels; additional acetate from buffer can modestly change ionic strength.
  • Acetate has weak metal-binding compared to citrate or EDTA; in cyanide assays where metal-cyanide equilibria matter, acetate is often chosen to minimize unintended complexation (method dependent).
• Compatibility
  • Generally compatible with proteins and nucleic acids at modest ionic strengths; however, low pH (4.5) can denature many proteins and affect enzyme activity—relevant only if cyanide workflow includes biological matrices.

Note: The above are literature/general considerations. This product is labeled for research use only and is not intended for clinical or diagnostic procedures unless explicitly validated by the user.

Buffer Applications

This is the primary section for this product.

• Item-specific facts (from Product Data)
  • Ready-to-use acetate buffer, pH 4.5, intended for cyanide determination workflows. Exact molarity and composition are not specified; consult the CoA/Spec Sheet.
• Why pH 4.5?
  • Centered near the acetic acid pKa (≈4.76, literature), pH 4.5 provides good buffer capacity while maintaining mildly acidic conditions that can be required in certain cyanide methods to control speciation or manage interferences.
• Practical use in the lab
  • Use as supplied unless your method specifies dilution. Verify pH at 25 °C with a calibrated pH meter before critical analyses.
  • Employ dedicated, clean glassware to avoid trace contamination, especially for low-level cyanide determinations.
• General preparation guidance (literature example formulation, not item-specific)
  • Example 0.1 M acetate buffer at pH 4.5: Mix 0.1 M acetic acid and 0.1 M sodium acetate in water to the Henderson–Hasselbalch ratio (base/acid ≈ 0.55 at 25 °C) and adjust to pH 4.50. Final ionic strength depends on total concentration.
  • Typical effective buffering range: pH 3.8–5.8.
• Compatibility/Interferences
  • Compared with phosphate, acetate reduces risk of metal phosphate precipitation but offers minimal chelation; confirm suitability where metal–cyanide equilibria are critical.
  • Avoid introducing strong oxidants or reductants that could impact cyanide chemistry.

Always defer to your cyanide method SOP for the exact buffer composition and role; cross-check with the product’s CoA/Spec Sheet.

Green Alternatives

This product is already an aqueous buffer, which aligns well with green chemistry principles. Selection among weak-acid buffers can further optimize safety and performance.

• Environmental and safety profile (general)
  • Water-based, nonflammable, and typically of low acute hazard. Minimal volatile organic content compared with organic solvent systems.
• Alternative buffers near pH 4–5 (literature/general)
  • Citrate buffer: Broader complexation capability; can mitigate some metal interferences but may introduce others; biodegradable.
  • Formate buffer: Lower pKa (3.75); higher volatility of formic acid compared with acetic; similar green profile.
  • Phosphate buffer (pH adjusted): Strong buffering but potential precipitation/complexation with certain metals; abundant and benign but not optimal at pH 4.5.

Comparison (general trends)

• Acetate (pKa 4.76): Good buffer capacity around 4.5; simple composition; minimal UV absorbance above ~230 nm (literature), generally compatible with colorimetric assays.
• Citrate (pKa2 4.76): Comparable pH performance; stronger metal chelation—can be beneficial or detrimental depending on method.
• Formate (pKa 3.75): Better buffering closer to pH 3.8–4.0; may be less ideal at 4.5 unless higher concentrations are used.

Trade-offs should be evaluated against the specific cyanide determination protocol to avoid altering analyte speciation or detection chemistry.

Pharmaceutical Uses

Not a drug product. For research use only.

• General formulation roles of acetate buffers (literature/general)
  • pH control in the mildly acidic range for small-molecule and biologic formulations (injections, ophthalmics), often chosen for compatibility and low ionic strength.
  • Stabilization of acid-sensitive actives or excipients; acetate’s minimal metal chelation can reduce unintended complexation.
  • Common in manufacturing steps requiring controlled pH without phosphate-related precipitation.
• Regulatory context
  • Acetate buffer systems are described in pharmacopeial texts; however, the specific compliance status, grade, and microbial limits of this item are Not specified for this item; refer to CoA/Spec Sheet.

If using buffers in GMP settings, verify grade, bioburden/endotoxin controls, and documentation requirements. This catalog item is intended for research laboratory applications.

Physical Properties

• Item-specific facts (from Product Data)
  • pH: 4.5 (nominal, per product name)
  • Physical state: Aqueous buffer solution (appearance details: Not specified for this item; refer to CoA/Spec Sheet.)
  • Concentration, ionic strength, buffer capacity: Not specified for this item; refer to CoA/Spec Sheet.
• Literature/general properties for acetate buffers
  • Effective buffering range (literature): Approximately pH 3.8–5.8 (centered near acetic acid pKa ≈ 4.76 at 25 °C).
  • Temperature coefficient (literature): pH of acetate buffers decreases slightly with increasing temperature; magnitude depends on composition. Verify pH at use temperature.
  • Solubility: Completely miscible with water; insoluble in nonpolar solvents.
  • Density/refractive index: Close to water; increases modestly with concentration of salts. Specific values depend on formulation (not item-specific).
• Compatibility and materials of construction (general)
  • Compatible with common lab plastics (PP, HDPE, PTFE) and borosilicate glass. Avoid reactive metals if method involves cyanide-bearing samples.
• Notes for cyanide methods
  • The mildly acidic pH 4.5 is frequently chosen to control speciation and minimize side reactions in certain cyanide analytical workflows; exact roles vary by method. Validate against your method SOP.

All physical property specifications that impact regulated methods (e.g., molarity, residual metal content, preservatives) should be taken from the item’s CoA/Spec Sheet.

Quality & Grades

• Item-specific quality attributes
  • Grade/purity: Not specified for this item; refer to CoA/Spec Sheet.
  • Stabilizers/preservatives: Not specified for this item; refer to CoA/Spec Sheet.
• Context for use in cyanide determination
  • Analytical cyanide methods (electrochemical, colorimetric, distillation-based, ligand-exchange) are sensitive to background contaminants, ionic strength, and pH accuracy. For best performance, buffers are typically prepared with high-purity reagents and metal-clean water to minimize blanks and interferences. Confirm that the supplied buffer specifications meet your method validation requirements (e.g., low trace metals, low organic background, certified pH at 25 °C).
• What buffer “grade” can imply (general guidance)
  • Analytical reagent/trace-analysis grade: Tight control of metallic impurities, organic carbon, and UV absorbance; packaged to limit contamination.
  • Routine laboratory grade: Suitable for general pH control; not optimized for trace analysis.
• Verification and documentation
  • Request and retain the CoA/Spec Sheet for details such as nominal molarity, pH tolerance, lot-to-lot variability, and any preservative content.
  • For regulated methods, document lot numbers and perform incoming QC (pH check at 25 °C, ionic strength/conductivity check if applicable).

Reaction & Applications

Primary use: pH control in analytical workflows for cyanide determination. The buffer provides a defined, mildly acidic environment that can influence cyanide speciation and certain interference-control steps.

• Typical applications (literature/general)
  • Colorimetric assays: Some cyanide colorimetric methods require a controlled pH stage to manage interferences or reagent stability; acetate at pH ~4.5 is sometimes employed in pretreatment or selective complexation steps as defined by the method SOP.
  • Ligand/speciation control: At pH 4.5, weakly bound cyanide complexes may be selectively addressed in workflows intended to distinguish “available” cyanide fractions. Use only in validated protocols—do not acidify bulk cyanide outside controlled apparatus.
  • Sample preparation: May be used to dilute, rinse, or condition glassware/electrodes in workflows that prohibit alkaline media at specific steps.
• Practical tips
  • Verify pH at working temperature (25 °C commonly assumed) using a calibrated, low-ionic-strength-compatible pH electrode.
  • Avoid contamination with cyanide or oxidants between steps; dedicate cleanware for blanks/standards.
  • If your method is trace-level, pre-rinse containers with buffer and assess procedural blanks to ensure the buffer contributes negligible background.
  • For metal-sensitive methods, confirm the buffer’s metal content or pre-treat with chelating resins only if allowed by the method.

Always follow the detailed procedure of the governing method (e.g., standard methods, regulatory SOPs). Composition-specific details for this item should be taken from the CoA/Spec Sheet.

Reaction Conditions

Because this product is a buffer solution rather than a reagent for bond-forming reactions, “reaction conditions” are best interpreted as usage conditions within analytical protocols.

• Typical usage (literature/general for cyanide methods)
  • Temperature: Ambient (20–25 °C) unless the method specifies otherwise. Verify pH at the working temperature.
  • Contact time: As directed by the method (e.g., pretreatment, conditioning, or controlled acidification steps). Overlong exposure to acidic media in cyanide workflows can evolve HCN—perform only as specified in a fume hood.
  • Matrix: Aqueous samples; avoid organic solvent content unless validated.
• Expected outcomes
  • Stable pH 4.5 environment to standardize conditions that influence cyanide speciation or reagent performance.
• Practical controls
  • Calibrate pH meters with standards bracketing pH 4.5.
  • Run reagent blanks and matrix spikes to ensure the buffer does not introduce background cyanide or interferences.
• Incompatible additions
  • Strong oxidants (e.g., chlorine, hypochlorite) or strong acids/bases can alter cyanide chemistry or degrade analytes. Only add reagents specified by the SOP.

Note: Concentration, ionic strength, and any additives for this specific item are Not specified for this item; refer to CoA/Spec Sheet.

Safety & Handling

• Item-specific hazard data
  • GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to SDS.
  • Storage: Room temperature (per Product Data). Keep container tightly closed to prevent contamination and evaporation.
• General safety profile (acetate buffers)
  • Typically classified as low hazard aqueous salt/weak acid solutions. May be mildly irritating to eyes/skin.
  • Recommended PPE: Safety glasses, lab coat, and appropriate gloves (e.g., nitrile). Use good laboratory hygiene.
• Incompatibilities and precautions
  • Avoid mixing with strong bases or acids unless intended by procedure; may shift pH and compromise analytical performance.
  • For labs handling cyanide-containing samples: Never acidify cyanide solutions outside of controlled, ventilated setups; acidification releases HCN gas. Perform cyanide analytical steps (including those using this buffer) in a fume hood per your SOP.
  • Avoid contact with reactive metals if samples contain cyanide.
• First-aid overview (general)
  • Skin/eye contact: Rinse with water for several minutes; remove contaminated clothing; seek medical advice if irritation persists.
  • Ingestion/inhalation: Rinse mouth; move to fresh air; seek medical attention as needed.
• Spills and disposal
  • Small spills: Wipe up with absorbent; rinse area with water. For spills contaminated with cyanide, follow cyanide-specific neutralization and hazardous waste procedures.

Always consult the product SDS and your institutional EHS guidance for authoritative safety information.

Solvent Selection

This product is an aqueous buffer; conventional “solvent selection” is not typically applicable. However, the following considerations help integrate it into analytical workflows:

• Polarity and miscibility
  • Highly polar, fully water-miscible. Not miscible with nonpolar organic solvents.
• Dielectric environment
  • Provides a high-dielectric, ionic medium suitable for aqueous-phase sample preparation and colorimetric/electrochemical cyanide methods.
• When to choose acetate vs alternatives (general)
  • Choose acetate near pH 4–5 when a mildly acidic buffer is required and phosphate or citrate may interfere with metal speciation or downstream detectors.
  • Alternatives: Citrate (similar pH window but stronger complexation), formate (lower pKa), or phosphate (broader utility but distinct complexation/precipitation behavior with metals). Select based on your cyanide method’s validated matrix.
• Practical notes
  • Mixing with organic modifiers (e.g., methanol, acetonitrile) is generally unnecessary for cyanide assays and may disrupt method conditions. If used, verify pH after blending.

For organic synthesis or chromatographic “solvent selection,” see those respective sections of your experiment; this buffer is intended primarily for aqueous analytical procedures.

Storage & Reconstitution

• Item-specific storage
  • Storage condition: Room temperature (per Product Data). Store tightly capped to minimize evaporation and contamination.
  • Shipping: Normal conditions.
• Stability and handling (general for aqueous acetate buffers)
  • Protect from microbial contamination; practice good aseptic handling for long-term use. If bioburden control is critical, sterile-filter upon opening if compatible with your method (verify this does not alter performance for cyanide analyses).
  • Avoid contact with reactive metals if the buffer will be used in cyanide workflows.
• Reconstitution/dilution
  • Supplied ready-to-use. If provided as a concentrate or if dilution is required by your method, details are Not specified for this item; refer to CoA/Spec Sheet. Use high-purity water and verify pH after any dilution.
• Shelf life
  • Not specified for this item; refer to CoA/Spec Sheet. As a general practice, date containers on opening and monitor for turbidity, precipitate, or pH drift before critical analyses.

Always consult the CoA/Spec Sheet and SDS for lot-specific guidance, and verify suitability within your validated cyanide determination protocol.

Structure & Identity

Brief description: A ready-to-use aqueous acetate buffer adjusted to pH 4.5 for use in analytical cyanide determinations.

• Item-specific facts (from Product Data)
  • Product: Acetate Buffer, pH 4.5, for Cyanide Determination (SKU: A298629)
  • Format: Aqueous buffer solution (exact composition and concentration: Not specified for this item; refer to CoA/Spec Sheet.)
  • Storage: Room temperature; shipped under normal conditions.
• Literature/general identity (for acetate buffers)
  • Typical components: Weak acid/base conjugate pair of acetic acid (CH3COOH) and acetate (commonly sodium acetate, CH3COO− Na+). Exact counterion(s) for this item are not specified.
  • Conceptual “formula”: Mixture of acetic acid/acetate in water at defined ratio to give pH 4.5.
  • Relevant pKa (acetic acid, literature): ~4.76 at 25 °C.
• Structural features (general)
  • Functional groups: Carboxylic acid (acetic acid) and carboxylate anion (acetate).
  • No fixed stereochemistry; small inorganic/organic ions in water.
• 2D structural description (general)
  • Acetic acid: CH3–C(=O)–OH; planar carboxyl group attached to a methyl.
  • Acetate: CH3–C(=O)–O− balanced by a counter-cation (commonly Na+); delocalized negative charge over the carboxylate oxygens.
• IDs (not applicable to mixtures)
  • CAS, SMILES, InChIKey, CID for the product mixture: Not assigned/not applicable. For individual components, consult component-specific references.

Note: Where precise identity (salt form, molarity, ionic strength, preservatives) is required for method validation, consult the item’s CoA/Spec Sheet.

Synthetic Utility

As a ready-made aqueous buffer at pH 4.5, this product is not primarily a synthetic building block. Nevertheless, acetate buffers can have roles in laboratory processes:

• General utility (literature/general)
  • Acid-catalyzed transformations in water where controlled mild acidity is required (e.g., hydrolysis of acetals more gently than with strong mineral acids).
  • Phase and pH control in biphasic or aqueous workups, quenching basic media, or extracting amines as their ammonium salts while limiting over-acidification.
  • Enzyme-mediated reactions that prefer mildly acidic conditions (if compatible with enzyme stability).
• Constraints
  • Limited applicability to water-sensitive or anhydrous reactions.
  • Buffer ions may participate in equilibria or salt formation; assess downstream purification needs.

For cyanide-related analyses, treat this buffer as an analytical reagent rather than a synthetic reagent; follow the reaction-specific guidance of your method SOP.

Target Specificity

Not applicable. This product is a chemical buffer solution and does not possess biological target specificity (no antigen/epitope, clone, isotype, or species reactivity). For analytical specificity in cyanide determination, refer to your validated method and the product’s CoA/Spec Sheet.