The CEMS clean lab is a 600 square-foot, metal-free laboratory, designed for open counter, low-blank sample handling.  Air is supplied by a ceiling-mounted HEPA filtration system that operates at one air exchange per minute.  Sample heating and drying is done in custom-made HEPA filtered dry-down stations that are rated for perchloric acid.  Several sub-boiling acid distillation units provide ultra-clean acids (HF, HNO3, HCl) for low-blank sample dissolution and column chemistry.  The lab includes a recirculating 18 MOhm water system fed by a reverse osmosis system coupled to a Millipore Super-Q.  Other ancillary equipment  include microbalances, centrifuges, and sonic baths.