Description

1,2,7,9-Tcdd is a specific tetrachlorinated dibenzo-p-dioxin isomer, a compound of significant interest in environmental and analytical chemistry research. Its precise structure makes it a critical reference standard for the accurate identification and quantification of dioxin congeners in complex matrices. This high-purity material is essential for laboratories and industries focused on environmental monitoring, toxicological studies, and regulatory compliance testing for persistent organic pollutants (POPs).

Application

• Analytical Reference Standard: Primary use as a certified standard for calibrating GC-MS and HRGC/HRMS systems in dioxin analysis.
• Environmental Testing: Quantification and congener-specific profiling of dioxins in soil, water, sediment, and air samples.
• Food & Feed Safety: Method development and validation for detecting dioxin contamination in the food chain to meet EU and global regulatory limits.
• Toxicological Research: Studying the specific biological activity, metabolism, and health impact of this isomer in scientific studies.
• Quality Control: Used by manufacturers of analytical kits and laboratories to verify the accuracy and precision of their testing protocols.
• Regulatory Compliance: Supporting industries in emissions testing and waste characterization to comply with international treaties like the Stockholm Convention.

Basic Information

Product Name	1,2,7,9-Tcdd
CAS No.	71669-23-3
Molecular Formula	C₁₂H₄Cl₄O₂
Molecular Weight	321.97 g/mol
Synonyms	1,2,7,9-Tetrachlorodibenzo-p-dioxin; 1,2,7,9-Tetrachlorodibenzodioxin; 1,2,7,9-TeCDD; NSC 174587; Dibenzo[b,e][1,4]dioxin, 1,2,7,9-tetrachloro-; 2,3,7,8-TCDD isomer (1,2,7,9-)
EINECS	Contact for details

Quality Control

Our 1,2,7,9-Tcdd is produced and handled under strict quality management systems to ensure the highest standards of purity and traceability required for analytical applications. Each batch is accompanied by a comprehensive Certificate of Analysis (COA) detailing purity, congener-specific identity confirmation, and solvent content. We support compliance with ISO 17025 and other relevant laboratory accreditation standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive and should be stored away from strong bases and organic solvents. For long-term stability, consider storage under inert atmosphere in a freezer (-20°C).

Specification

Item	Specification
Appearance	White to off-white solid
Identification (IR)	Conforms to reference spectrum
Identification (GC-MS)	Conforms to reference standard
Purity (HPLC)	≥ 98.0% (by area)
Related Congeners (GC)	≤ 1.0% (total)
Solvent Content (Residual Solvents)	Meets ICH guidelines

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