12 PCNs Mixed Standard (Appendix B, T/CSES 132-2023) FAQ

12 PCNs Mixed Standard (Appendix B, T/CSES 132-2023) is a certified mixture of 12 polychlorinated naphthalene congeners dissolved in toluene, formulated to meet the analytical requirements specified in Appendix B of the Chinese group standard T/CSES 132-2023 for environmental monitoring of polychlorinated naphthalenes.

SKU

P1539338

Supplier Stock Code

PT75004MK-1T (谱同生物)

Matrix / Solvent

Toluene

Number of Components

12 PCN congeners

Applicable Standard

T/CSES 132-2023, Appendix B

Application

Environmental monitoring and analysis of polychlorinated naphthalenes

What Are Polychlorinated Naphthalenes (PCNs) and Why Are They Regulated?

Polychlorinated naphthalenes (PCNs) are a class of persistent organic pollutants (POPs) consisting of naphthalene rings substituted with one to eight chlorine atoms, yielding 75 possible congeners. They are chemically stable, lipophilic, and resistant to biological and chemical degradation, leading to bioaccumulation in environmental matrices and living organisms.

Due to their toxicity, persistence, and potential for long-range environmental transport, PCNs are subject to regulatory scrutiny internationally and in China. The Chinese group standard T/CSES 132-2023 establishes test methods and requirements for PCN determination in environmental samples, with Appendix B specifying the 12 congeners required for the mixed standard used in calibration and quantification workflows.

What Does T/CSES 132-2023 Appendix B Specify?

T/CSES 132-2023 is a Chinese group standard issued by the Chinese Society for Environmental Sciences (CSES) that provides standardized analytical methodologies for the detection of polychlorinated naphthalenes in environmental samples such as soil, sediment, water, and biota.

Appendix B of this standard specifies the exact set of 12 PCN congeners that must be included in the calibration mixed standard solution. This ensures comparability and traceability of analytical results across laboratories performing PCN monitoring in compliance with the standard. The 12 PCNs Mixed Standard (SKU P1539338) is formulated directly to satisfy these requirements, providing a ready-to-use reference solution in toluene.

How to Store and Handle the 12 PCNs Mixed Standard?

As with all halogenated organic standard solutions in organic solvents, proper storage and handling are essential to maintain accuracy and safety. General best practices for PCN standards in toluene include:

• Storage temperature: Refrigerate at 2–8 °C in a tightly sealed vial, away from light and heat sources to prevent solvent evaporation and congener degradation.
• Solvent hazard: Toluene is a flammable organic solvent and potential health hazard; handle in a well-ventilated fume hood, wearing appropriate PPE (lab coat, nitrile gloves, safety goggles).
• Stability: Check the certificate of analysis (CoA) for the specific expiry date. Avoid repeated freeze-thaw cycles.
• Contamination prevention: Use clean, solvent-compatible syringes or pipettes for aliquoting to prevent cross-contamination.

Refer to the product Safety Data Sheet (SDS) and Certificate of Analysis for authoritative storage conditions and concentration values.

Typical Analytical Workflow for PCN Determination Using This Standard

The 12 PCNs Mixed Standard is designed for use as a calibration reference in chromatographic analysis, typically gas chromatography coupled with high-resolution mass spectrometry (GC-HRMS) or gas chromatography with electron capture detection (GC-ECD), as recommended for POPs analysis.

1. Calibration curve preparation: Dilute the mixed standard in toluene to prepare a series of calibration solutions spanning the expected concentration range in samples.
2. Internal standard addition: Add appropriate isotopically labelled PCN internal standards (if required by the method) to each calibration and sample solution.
3. Instrument calibration: Inject calibration solutions and establish response factors or calibration curves for each of the 12 congeners.
4. Sample analysis: Extract, clean up, and concentrate environmental samples according to T/CSES 132-2023 procedures, then analyse against the calibration.
5. QA/QC: Include blank, duplicate, and spike recovery checks to validate method performance.

Always consult T/CSES 132-2023 Appendix B for the authoritative method protocol.

Ordering and Availability

The 12 PCNs Mixed Standard (Appendix B, T/CSES 132-2023) is available from Aladdin Scientific under SKU P1539338. The product is sourced from 谱同生物 (Putong Bio) under their stock code PT75004MK-1T and is supplied as a solution of 12 PCN congeners in toluene.

To place an order, contact your Aladdin Scientific account representative, use the online ordering portal, or reach out to customer service. For bulk orders, custom concentrations, or certificate of analysis requests, please contact technical support. Ensure compliance with local regulations regarding the import, storage, and use of persistent organic pollutant reference standards before ordering.

Frequently asked questions

What are the 12 PCN congeners included in this mixed standard?

The specific 12 PCN congeners are defined in Appendix B of T/CSES 132-2023. The product Certificate of Analysis (CoA) for SKU P1539338 provides the definitive list of congeners and their individual concentrations. Please request the CoA from Aladdin Scientific for full compositional details.

What is the concentration of each PCN congener in the mixed standard?

Individual congener concentrations are specified on the product Certificate of Analysis (CoA) and may vary by lot. Concentration information is not independently confirmed in this document; please contact Aladdin Scientific or request the CoA and product datasheet for SKU P1539338 to obtain authoritative concentration values.

Is this standard suitable for use with GC-MS instrumentation?

Yes, PCN mixed standards in toluene are generally compatible with gas chromatography-based analytical methods, including GC-MS and GC-HRMS, which are the recommended techniques for PCN analysis per standard environmental monitoring protocols. Always verify instrument compatibility and injection solvent requirements with your specific GC-MS method before use.

How should I dispose of unused PCN standard solution?

PCN standard solutions in toluene must be disposed of as hazardous chemical waste in accordance with local environmental regulations and institutional guidelines. PCNs are classified as persistent organic pollutants and must not be poured down the drain. Contact your institutional environmental health and safety (EHS) office for approved disposal procedures.

Can I use this standard for matrices other than those specified in T/CSES 132-2023?

The 12 PCNs Mixed Standard is formulated to comply with T/CSES 132-2023 Appendix B requirements. While it may be technically applicable to other PCN analytical methods requiring the same congener set, users should validate the standard against the specific method requirements, matrix types, and acceptance criteria of any alternative application before use.

References

1. T/CSES 132-2023: Chinese Group Standard for the Determination of Polychlorinated Naphthalenes in Environmental Samples, Chinese Society for Environmental Sciences, 2023.
2. Product information: 12 PCNs Mixed Standard (Appendix B, T/CSES 132-2023), SKU P1539338, Aladdin Scientific; sourced from 谱同生物, stock code PT75004MK-1T.

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