Assessment of metal-contaminated sediments from the Southeast Missouri (SEMO) mining district using sediment toxicity tests with amphipods and freshwater mussels

An improved bag clamp and bag cutter is presented that is a non-obvious increase in capability over this inventor's previous bag clamp/cutter invention. The improved clamp possesses a stronger spring, an improved cutting blade with safety guard, a springboard button for pressing the blade firmly against a bag surface, and other improvements.