develop consensus standards for use by TNI's programs. This group has a support role in assisting other programs with activities such as guidance and standards interpretation.
fosters the generation of data of known and documented quality is through the National Environmental Laboratory Accreditation Program, or NELAP. The purpose of this program is to establish and implement a program for the accreditation of environmental laboratories.
is to establish and maintain a national PT program to support TNI’s National Environmental Laboratory Accreditation Program, and other activities.
Field Activities Program (NEFAP) Executive Committee is to establish and implement an accreditation program for field sampling and measurement organizations (FSMOs).
Audit Sample Program is to develop consensus standards for the manufacture and analysis of audit samples for source emission testing.
on a variety of topics of interest to the environmental measurement community. TNI also hosts two regularly scheduled meetings per year, typically in January and August. Both are a week long and involve open meetings of TNI committees as well as training courses and other special sessions.Standard Interpretation
Standard: 2016
Section: V1M5, Section 1.7.3.6
REQUEST:
Please clarify if the requirement to test each pre-prepared, ready-to-use lot of medium and each batch of medium prepared in the laboratory is with a mix of pure positive culture controls, which would be the equivalent to a raw sewerage sample, or if the test is with a pure positive controls conducted separately for each culture.
TNI FINAL RESPONSE:
No, the Standard does not allow for a mix of culture controls for testing media. The media for each method must be tested with a pure positive culture control of each target organism separately.
In 1.7.3.6.c, the Standard states that microorganisms may be "cultures maintained for their intended use by documented procedures that demonstrate continued purity and viability" of the target organism(s). The "continued purity of the culture" ensures the culture contains a single strain of organism.