Rationale

Test Method E2677 underpins Practice E2520, which is used to test instruments deployed internationally for detecting trace explosives and protect the public and infrastructure. E2677 utilizes the public website https://www-s.nist.gov/loda, which provides a tool for reliable calculation of limits of detection. This website was last updated over ten years ago so will be updated with further explanations and the latest IT security features. Ease of use of E2677 by non-experts has been an issue, so we will clarify the test procedures and add an Appendix with examples of completed data sheets and web pages.