Description

2,3,3',4,4',5,5'-Heptachlorobiphenyl CAS NO 39635-31-9 is a specific, high-purity congener of polychlorinated biphenyls (PCBs), a class of synthetic organic chemicals. This compound is of significant importance as a certified reference material and analytical standard for environmental monitoring, toxicological research, and regulatory compliance testing. It is primarily required by analytical laboratories, research institutions, and environmental agencies engaged in the precise quantification and study of persistent organic pollutants (POPs) to ensure data accuracy and meet global regulatory standards.

Application

• Certified Reference Standard for the calibration of analytical instruments (GC, GC-MS, HPLC) in environmental testing.
• Analytical Method Development and Validation for the detection and quantification of PCB congeners in complex matrices.
• Toxicological and Ecotoxicological Research to study the environmental fate, bioaccumulation, and health effects of dioxin-like PCBs.
• Quality Control/Quality Assurance (QC/QA) in laboratories performing compliance testing for regulations like the Stockholm Convention, EPA methods, and EU directives.
• Forensic Environmental Analysis for source identification and apportionment in pollution incidents.
• Manufacturing of Calibration Kits and Solutions for sale to environmental testing laboratories.

Basic Information

Product Name	2,3,3',4,4',5,5'-Heptachlorobiphenyl
CAS No.	39635-31-9
Molecular Formula	C₁₂H₃Cl₇
Molecular Weight	395.32 g/mol
Synonyms	PCB 189; 2,3,3',4,4',5,5'-Heptachloro-1,1'-biphenyl; 1,1'-Biphenyl, 2,3,3',4,4',5,5'-heptachloro-; Heptachlorobiphenyl (PCB 189); PCB-189; 2,3,3',4,4',5,5'-HeptaCB; BZ# 189; 3,3',4,4',5,5',6-Heptachlorobiphenyl (alternate numbering)
EINECS	Contact for details

Quality Control

Our high-purity 2,3,3',4,4',5,5'-Heptachlorobiphenyl is manufactured and handled under strict quality protocols to ensure identity, purity, and stability. Each batch is rigorously analyzed using advanced chromatographic and spectroscopic techniques. A comprehensive Certificate of Analysis (COA) is provided, detailing purity, congener-specific identity confirmation, and levels of any critical impurities, ensuring it meets the exacting requirements for use as a reference material.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (typically 15-25°C). For long-term stability, storage at -20°C is recommended. Keep the container sealed under an inert atmosphere to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white solid
Identification (IR)	Conforms to structure
Identification (GC/MS)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Purity (GC)	≥ 98.0%
Related Substances (HPLC/GC)	Total other PCBs ≤ 2.0%
Solubility	Soluble in common organic solvents (e.g., toluene, hexane)

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