1,2-Dichlorobenzene Standard: Uses, Handling & FAQs

1,2-Dichlorobenzene Standard is a certified reference material used for the accurate quantification and identification of o-dichlorobenzene in environmental, industrial, and research analytical workflows.

Product Name

1,2-Dichlorobenzene Standard

SKU

D128170

Chemical Name

1,2-Dichlorobenzene (o-Dichlorobenzene)

CAS Number

95-50-1

Molecular Formula

C₆H₄Cl₂

Molecular Weight

147.00 g/mol

Primary Application

Analytical reference standard for GC, GC-MS, and environmental monitoring

Storage Condition

Store in a cool, well-ventilated area away from light and ignition sources

What Is 1,2-Dichlorobenzene Standard?

1,2-Dichlorobenzene Standard (SKU: D128170) is a high-purity reference material based on o-dichlorobenzene, a chlorinated aromatic compound with CAS number 95-50-1 and molecular formula C₆H₄Cl₂. It is the ortho isomer of dichlorobenzene, distinguished from the meta (1,3-) and para (1,4-) isomers by the adjacent positioning of the two chlorine substituents on the benzene ring.

As an analytical standard, it is prepared and certified to ensure traceability and accuracy in quantitative analysis. It is commonly supplied as a neat liquid or as a solution in an appropriate solvent at a defined concentration. Researchers use it to calibrate instruments, validate methods, and confirm the identity of o-dichlorobenzene in test samples.

Key Applications in Research and Environmental Analysis

1,2-Dichlorobenzene Standard is widely applied across several analytical disciplines:

• Environmental monitoring: o-Dichlorobenzene is classified as a priority pollutant by regulatory agencies including the US EPA. This standard is used to quantify its presence in water, soil, and air samples by GC or GC-MS methods.
• Method development and validation: Laboratories developing or validating analytical methods for chlorinated aromatics use this standard to establish linearity, limits of detection, and accuracy.
• Industrial quality control: Manufacturers using or producing chlorinated solvents use the standard to verify product purity and monitor process streams.
• Research applications: Academic and industrial researchers studying reaction mechanisms, metabolite profiling, or toxicology of chlorinated compounds use the standard as a verified reference.

Its well-defined physical and chemical properties make it suitable for retention time calibration in chromatographic systems.

Storage, Stability, and Handling Precautions

Storage: Store 1,2-Dichlorobenzene Standard in a tightly sealed container in a cool, dry, and well-ventilated area, away from direct light and heat sources. Keep away from incompatible materials such as strong oxidizing agents and strong bases.

Stability: Under recommended storage conditions, o-dichlorobenzene is chemically stable. However, prolonged exposure to air, moisture, or elevated temperatures may affect the certified concentration of solution standards. Always check the certificate of analysis (CoA) for expiry date and storage recommendations specific to your lot.

Handling precautions: 1,2-Dichlorobenzene is a harmful liquid and vapour. Use appropriate personal protective equipment (PPE) including chemical-resistant gloves, safety glasses, and a lab coat. Work in a fume hood or adequately ventilated area. Avoid inhalation of vapours and contact with skin or eyes. Consult the Safety Data Sheet (SDS) for full hazard information before use.

Disposal: Dispose of as hazardous chemical waste in accordance with local, regional, and national regulations.

How to Use 1,2-Dichlorobenzene Standard for Calibration

Proper use of the standard is essential for reliable analytical results. Follow these general guidelines:

1. Review the CoA: Confirm the certified concentration, purity, solvent (if applicable), and expiry date before preparing calibration solutions.
2. Prepare calibration solutions: Dilute the standard gravimetrically or volumetrically using a high-purity, GC-grade solvent compatible with your analytical method. Prepare a minimum of five calibration levels spanning the expected sample concentration range to establish a linear calibration curve.
3. Instrument calibration: Inject calibration solutions under the same instrument conditions (column, temperature program, detector settings) as your samples. For GC-MS, use the characteristic ions of 1,2-dichlorobenzene (m/z 146, 148 for the molecular ion cluster) for selected ion monitoring (SIM) if required.
4. Quality control: Include a mid-level calibration check standard and a blank with each analytical batch to confirm ongoing instrument performance and the absence of contamination.
5. Documentation: Record all preparation details, instrument parameters, and results to maintain traceability in compliance with GLP or ISO 17025 requirements.

Regulatory Context and Compliance Considerations

1,2-Dichlorobenzene is listed as a priority pollutant under the US EPA Clean Water Act and appears on monitoring lists in various international environmental frameworks. Analytical laboratories performing regulatory compliance testing are required to use certified reference standards that are traceable to national or international measurement standards.

When selecting a standard for compliance work, verify that the product's certificate of analysis (CoA) provides the following: certified purity or concentration value, uncertainty of measurement, traceability statement, and expiry date. Laboratories accredited under ISO/IEC 17025 must document the traceability chain for all reference standards used.

For occupational exposure, consult current regulatory thresholds (e.g., OSHA PELs, ACGIH TLVs) for 1,2-dichlorobenzene and ensure that workplace handling procedures are compliant. Always refer to the current SDS provided with the product for up-to-date regulatory and hazard information.

Frequently asked questions

What purity level does the 1,2-Dichlorobenzene Standard (D128170) have?

The specific certified purity or concentration of D128170 should be confirmed on the product's Certificate of Analysis (CoA), which is available upon request or via the Aladdin Scientific website for your specific lot number. Reference standards are typically supplied at high purity (e.g., ≥98% or as a certified solution); always use the CoA value for your calculations.

Which solvents are compatible with 1,2-Dichlorobenzene Standard for preparing dilutions?

Common GC-grade solvents such as methanol, acetonitrile, hexane, and dichloromethane are generally compatible with 1,2-dichlorobenzene for preparing working calibration solutions. Solvent choice should be guided by your specific analytical method requirements (e.g., EPA method specifications) and instrument compatibility. Avoid solvents that may co-elute with the analyte under your chromatographic conditions.

How should I verify the integrity of the 1,2-Dichlorobenzene Standard before use?

Before use, inspect the container for any signs of damage, leakage, or discolouration. Check that the seal is intact and that the product has been stored according to the conditions stated on the CoA and label. Confirm the lot number, expiry date, and certified value on the CoA match the container. If any discrepancy is found or the standard appears compromised, do not use it and contact Aladdin Scientific customer support.

Is 1,2-Dichlorobenzene Standard suitable for EPA method compliance testing?

o-Dichlorobenzene is included in several EPA analytical methods for water and environmental matrices. Whether D128170 meets the specific traceability and certification requirements of a particular EPA method depends on the method's specifications and the certifications documented in the product's CoA. Contact Aladdin Scientific to confirm suitability and to obtain full certification documentation for your compliance application.

What safety precautions are required when handling 1,2-Dichlorobenzene Standard?

1,2-Dichlorobenzene is harmful if inhaled, ingested, or absorbed through the skin, and its vapours can be irritating. Always handle in a fume hood, wear chemical-resistant gloves, safety glasses, and a lab coat. Avoid generating aerosols or vapours. Store away from heat, open flames, and incompatible chemicals. Refer to the Safety Data Sheet (SDS) supplied with D128170 for complete hazard, first-aid, and emergency response information.

References

1. US EPA. Priority Pollutant List. United States Environmental Protection Agency.
2. National Institute of Standards and Technology (NIST). 1,2-Dichlorobenzene. NIST Chemistry WebBook, SRD 69.
3. ISO/IEC 17025:2017. General requirements for the competence of testing and calibration laboratories. International Organization for Standardization.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.