These glass vial are used primarily for the collection and testing of aqueous samples for Volatile Organic Analysis, Total Organic Carbon (TOC) and Total Petroleum Hydrocarbons (TPH). Secondary uses include containment of extracts. Please refer to the applicable Certificate of Analysis for certified analytes and corresponding reporting limits. Vials have a 24-414 finish with a white polypropylene plastic 2-piece hole cap with PTFE Septa. Certified by cleaning protocol B1