The Xact® 920 system uses reel-to-reel filter tape sampling and nondestructive X-ray fluorescence (XRF) analysis to monitor aqueous samples for user-selected metals.
A measured amount of unknown sample is blended with a known amount of internal standard which is continuously nebulized, evaporated, and collected onto the filter tape. The liquid sample is
aerosolized facilitating the removal of water and allowed metal salts to be concentrated on the filter tape. This method of pre-concentration allows detection limits in the low parts per billion (ppb) ranges for elements ranging from potassium to uranium.
The concentrated deposit is automatically advanced and analyzed by XRF for selected metals as the subsequent sample is collected. Sampling and analysis are performed continuously and simultaneously, except during advancement of the tape (~20 sec) and during daily-automated quality assurance checks.