Notice of Proposed Revisions to TNI Fields of Proficiency Testing Tables - Comment Period Open Through July 11, 2025

Date Posted: 5-28-2025

The NELAC Institute (TNI) Proficiency Testing Program Executive Committee (PTPEC) is approving revisions to the TNI Fields of Proficiency Testing (FoPT) tables for Non-Potable Water (NPW) and Solid and Chemical Materials (SCM), specifically regarding Proficiency Testing Reporting Limits (PTRLs) and chemical nomenclature.

Summary of Changes

Non-Potable Water (NPW) Table

  • Correction of the PTRL for Mercury.
  • Correction of the CAS number and nomenclature for trans-Chlordane.

Solid and Chemical Materials (SCM) Table

  • Correction of the CAS number and nomenclature for trans-Chlordane.

These revisions reflect the PTPEC's decision to only use the cis- and trans- terminology for Chlordane. It is also noted that gamma-Chlordane (CAS# 5566-34-7) is not commercially available as a Certified Reference Material (CRM) or as a neat chemical.

Request for Public Comment

PTPEC is soliciting public comments on the changes outlined above and highlighted in magenta in the updated FoPT tables linked below. The comment period will remain open for 45 days, closing on July 11, 2025.

Link to Non-Potable Water Draft FoPT Table (PDF)
Link to Solid and Chemical Materials Draft FoPT Table (PDF)

Submit comments to both:

Comment Submissions Must Include:

  • Name
  • Affiliation
  • Email Address
  • Phone Number
  • Comments

All submitted comments will be reviewed by the PTPEC and, if appropriate, incorporated into the tables prior to final PTPEC approval and determination of an effective date.

Thank you for your continued support in maintaining the integrity and accuracy of the TNI Proficiency Testing Program.