Description

3,4-Dichlorobiphenyl is a specific congener of polychlorinated biphenyls (PCBs), characterized by chlorine atoms at the 3 and 4 positions on one of its phenyl rings. This compound is of significant importance as a high-purity reference standard and analytical intermediate for environmental monitoring, toxicology research, and regulatory compliance testing. It is primarily needed by analytical laboratories, research institutions, and chemical manufacturers engaged in the study of persistent organic pollutants (POPs) and the development of detection methods.

Application

• Environmental Analysis Reference Standard: Used as a certified reference material (CRM) for calibrating equipment in the analysis of PCB contaminants in soil, water, and air samples.
• Toxicological Research: Serves as a precise chemical entity in studies investigating the metabolism, environmental fate, and specific toxic effects of individual PCB congeners.
• Method Development and Validation: Employed by analytical chemists to develop and validate chromatographic methods (GC-MS, HPLC) for the separation and quantification of complex PCB mixtures.
• Quality Control/Assurance: Acts as an internal standard or spike in laboratory QC procedures to ensure accuracy and precision in PCB testing protocols.
• Regulatory Compliance Testing: Essential for laboratories performing tests to comply with international regulations (e.g., Stockholm Convention, EPA methods) regarding POPs monitoring.
• Chemical Synthesis Intermediate: Used in specialized organic synthesis to create derivatives for further research or for producing labeled (e.g., ¹³C) internal standards.

Basic Information

Product Name	3,4-Dichlorobiphenyl
CAS No.	2974-92-7
Molecular Formula	C₁₂H₈Cl₂
Molecular Weight	223.10 g/mol
Synonyms	PCB 13; 1,2-Dichloro-4-phenylbenzene; 3,4-Dichloro-1,1'-biphenyl; 4-Phenyl-1,2-dichlorobenzene; 3,4-DCB; Biphenyl, 3,4-dichloro-; NSC 60648
EINECS	221-030-0

Quality Control

Our 3,4-Dichlorobiphenyl is produced and handled under strict quality management protocols. Each batch undergoes rigorous analytical testing including identity confirmation by GC-MS and/or NMR, and purity assessment by HPLC to ensure it meets the high standards required for reference materials. A comprehensive Certificate of Analysis (COA) detailing batch-specific results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at controlled room temperature (typically 15-25°C). Keep away from heat and incompatible materials. For long-term storage under inert atmosphere, please contact us for specific recommendations.

Specification

Item	Specification
Appearance	White to off-white crystalline solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Melting Point	Contact for details
Residual Solvents (GC)	Meets ICH guidelines

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.