2,2',3,4,4',5'-Hexabromodiphenyl Ether: FAQs & Key Facts

2,2',3,4,4',5'-Hexabromodiphenyl Ether is a hexabrominated diphenyl ether congener (commonly designated BDE-138) widely used as an analytical reference standard for the detection and quantification of polybrominated diphenyl ether (PBDE) contaminants in environmental, biological, and food-safety research.

Chemical Name

2,2',3,4,4',5'-Hexabromodiphenyl Ether

Common Designation

BDE-138

SKU / Catalog Number

H1539654

Compound Class

Polybrominated Diphenyl Ether (PBDE) congener

Primary Application

Analytical reference standard for PBDE residue analysis

Regulatory Relevance

Subject to monitoring under Stockholm Convention and EU RoHS/REACH frameworks

What Is 2,2',3,4,4',5'-Hexabromodiphenyl Ether (BDE-138)?

2,2',3,4,4',5'-Hexabromodiphenyl Ether, designated BDE-138 under the PBDE congener numbering system, is a fully halogenated aromatic ether belonging to the polybrominated diphenyl ether (PBDE) family. PBDEs were historically incorporated into polymers, textiles, and electronic equipment as additive brominated flame retardants. BDE-138 carries six bromine substituents distributed across both phenyl rings at the 2, 3, 4, 5 positions of one ring and the 2', 4', 4 positions of the other, giving the molecule a high degree of bromination and consequent lipophilicity.

Because PBDEs are chemically stable and lipophilic, they persist in the environment and bioaccumulate in fatty tissues of wildlife and humans. BDE-138 is therefore a target analyte in environmental monitoring programs, food safety surveillance, and toxicological studies. Aladdin Scientific supplies BDE-138 (SKU H1539654) as a high-purity reference standard to support accurate quantitative analysis.

Physical and Chemical Properties

BDE-138 is a solid at room temperature with a high molecular weight attributable to its six bromine atoms. Its log K_ow value indicates strong hydrophobicity and affinity for organic matter and lipid compartments. The compound is practically insoluble in water but dissolves readily in common organic solvents such as toluene, hexane, dichloromethane, and acetone, which are typically used to prepare working standards for chromatographic analysis.

Thermally, BDE-138 is stable under ordinary laboratory storage conditions but should not be subjected to open-flame or high-temperature environments, as thermal degradation can generate toxic brominated byproducts. Specific numerical values for melting point, boiling point, and exact log K_ow should be confirmed from the official Certificate of Analysis (CoA) supplied with each lot.

Safe Handling, Storage, and Disposal

Handling: BDE-138 should be handled in a well-ventilated fume hood. Appropriate personal protective equipment (PPE) — including nitrile gloves, a lab coat, and safety glasses — must be worn at all times. Avoid generating dust or aerosols. Because BDE-138 is a suspected endocrine disruptor and persistent environmental contaminant, minimizing exposure is strongly recommended.

Storage: Store the compound in a tightly sealed container away from light, heat, and moisture. Refrigerated storage (2–8 °C) in an amber vial is generally recommended to maintain compound integrity over time. Consult the product-specific Safety Data Sheet (SDS) for precise storage temperature and conditions.

Disposal: BDE-138 and solutions containing it must be disposed of as halogenated hazardous waste in accordance with local, national, and international regulations. Do not pour down the drain or discard in general waste. Always consult your institution's Environmental Health and Safety (EHS) office for approved disposal procedures.

Analytical Applications and Recommended Techniques

BDE-138 reference standards are primarily used to calibrate and validate instrumental methods for PBDE congener profiling. The preferred analytical techniques include:

• Gas Chromatography–Mass Spectrometry (GC-MS / GC-MS/MS): The gold standard for PBDE analysis, offering high sensitivity and selectivity. Electron capture negative ionization (ECNI) mode is particularly suitable for halogenated compounds.
• Gas Chromatography with Electron Capture Detection (GC-ECD): A cost-effective alternative for routine screening of brominated contaminants.
• High-Resolution Mass Spectrometry (HRMS): Used in confirmatory and research-grade analyses where exact mass determination is required.

BDE-138 standards are employed in environmental matrices (sediment, water, air particulates), biological tissues (blood, adipose, liver), and food products (fish, dairy). Proper isotope-labeled internal standards should be co-spiked to correct for matrix effects and recovery losses during sample preparation.

Ordering, Quality, and Regulatory Compliance

Aladdin Scientific supplies 2,2',3,4,4',5'-Hexabromodiphenyl Ether under catalog number H1539654. Each lot is accompanied by a Certificate of Analysis (CoA) documenting purity, analytical data, and lot-specific test results. Researchers requiring traceable reference standards for regulatory submissions should confirm whether the specific lot meets the traceability requirements of their applicable standard (e.g., ISO 17025 accredited methods).

Given the regulatory status of PBDEs under international frameworks such as the Stockholm Convention on Persistent Organic Pollutants and the EU's RoHS and REACH directives, import and use of BDE-138 may be subject to permitting or reporting requirements in certain jurisdictions. Customers are advised to verify applicable regulations before ordering. For volume pricing, custom concentrations, or bulk quantities, please contact Aladdin Scientific customer support.

Frequently asked questions

What is the PBDE congener number for 2,2',3,4,4',5'-Hexabromodiphenyl Ether?

2,2',3,4,4',5'-Hexabromodiphenyl Ether is designated BDE-138 in the standard PBDE congener numbering system. This system assigns a unique number to each of the 209 possible PBDE congeners based on the number and position of bromine substituents on the diphenyl ether scaffold.

In which solvents should I prepare a working standard solution of BDE-138?

BDE-138 dissolves readily in nonpolar to moderately polar organic solvents. Toluene, isooctane, hexane, and dichloromethane are most commonly used for GC-based PBDE analysis. The choice of solvent should be compatible with your analytical instrument and sample preparation protocol. Avoid aqueous or highly polar solvents, as BDE-138 has very low water solubility.

How should I store BDE-138 (H1539654) to ensure long-term stability?

Store BDE-138 in a tightly sealed amber glass vial at 2–8 °C, away from light, heat sources, and moisture. Ensure the container is kept in a well-ventilated, locked storage area designated for hazardous chemicals. Check the lot-specific Certificate of Analysis and Safety Data Sheet for any additional storage requirements, and observe the recommended use-by date.

Is BDE-138 subject to any import restrictions or regulatory controls?

Yes. Hexabrominated diphenyl ethers, including BDE-138, may be subject to controls under the Stockholm Convention on Persistent Organic Pollutants and regional regulations such as the EU RoHS Directive and REACH. Import permits or reporting obligations may apply depending on your country of import and intended use. Customers are strongly advised to consult with their institution's regulatory or EHS team and verify applicable national regulations before placing an order.

Does Aladdin Scientific provide a Certificate of Analysis (CoA) for H1539654?

Yes. Every lot of H1539654 (2,2',3,4,4',5'-Hexabromodiphenyl Ether) is supplied with a Certificate of Analysis detailing purity, test methods, and lot-specific analytical results. Customers can request the CoA for a specific lot number through the Aladdin Scientific website or by contacting customer support directly.

What analytical technique is recommended for quantifying BDE-138 in environmental or biological samples?

GC-MS or GC-MS/MS operated in electron capture negative ionization (ECNI) mode is the most widely recommended technique for quantifying BDE-138 and other PBDE congeners due to its high sensitivity, selectivity, and ability to discriminate individual congeners. GC-ECD is an alternative for routine screening. Isotope-labeled internal standards (e.g., 13C-labeled PBDE congeners) should be used to correct for matrix effects and recovery variability.

References

1. de Wit CA. An overview of brominated flame retardants in the environment. Chemosphere. 2002;46(5):583-624. doi:10.1016/S0045-6535(01)00225-9
2. La Guardia MJ, Hale RC, Harvey E. Detailed polybrominated diphenyl ether (PBDE) congener composition of the widely used penta-, octa-, and deca-PBDE technical flame-retardant mixtures. Environmental Science & Technology. 2006;40(20):6247-6254. doi:10.1021/es060630m
3. Stockholm Convention on Persistent Organic Pollutants. United Nations Environment Programme (UNEP). Available at: http://www.pops.int
4. Stapleton HM. Instrumental methods and challenges in quantifying polybrominated diphenyl ethers in environmental extracts. Analytical and Bioanalytical Chemistry. 2006;386(4):807-819. doi:10.1007/s00216-006-0400-y

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