# Ultratrace analysis { "id": "S86000502", "title": "Ultratrace analysis", "url": "/topics/S86000502", "kind": "topic-directory", "aeo_cohort": "topic-directory", "provider": "lcsh", "revision": "e2284398085e324d", "catalogue_revision": "f050b5d4780b1289", "numeric_address": "14413911362067645956", "address_version": "morton4x16-v1", "coordinates": [ 0, 20, 33037, 55296 ], "answer_status": "Directory metadata; local answer requires separate source review", "truth_status": "Subject descriptor, not a factual answer or a demonstrated knowledge gap" } Here are entered works on analysis of submicrogram concentrations of elements and substances. Works on the analysis of microgram concentrations of elements and substances are entered under [Trace analysis.] Directory metadata is not a factual answer or evidence of a global knowledge gap. Source: https://id.loc.gov/authorities/subjects/sh86000502 No owner-reviewed local answer yet.