State and federal regulations require that all containers holding hazardous waste be closed except when it is necessary to add or remove waste. The term "In-line" waste describes the process where chemical waste flows through tubing from a machine into a collection container. The tubing is hard connected from the machine and fits into a specifically designed cap that meets closed container requirements. Typically, High Performance Liquid Chromatography (HPLC) and Inductively Coupled Plasma (ICP) instruments generate waste in this manner.
Compliant in-line waste assembly
Pictured below are two examples of non compliant in-line waste assemblies. Inserting waste lines into an open bottle top (a missing cap), or sealing a container with parafilm does not constitute a closed container. Additionally, drilling holes through an original cap and inserting waste lines through the cap does not meet the regulatory intent of a closed container.