An upright suction cleaner having a base, a body pivotally mounted on the base, a suction device, and a dirt separation system. The removable tray device comprises a tray component secured to a folding chair via a pinned hinge that allows the tray component to rotate vertically and a swivel component that allows the tray component to swivel horizontally. Such organic working fluids are also operable as heat transfer fluids either in ORC power plants or units or in other heat transfer systems. The end cap includes a cylindrical through hole that accepts a rotatable D-ring. Detection may involve conventional fluorescence assay, enzyme-linked immunosorbent assay, optical microscope, electron microscope, or a combination thereof. The problem imposed on high sensitivity evaluation of metals contained in silicon bulk is, in addition to increase of sensitivity of analysis apparatus itself, how to extract metals contained in a silicon wafer to a surface and recover them.