Millennium Excalibur to be able to measure Arsenic in solids, sludges and liquids. By a simple lamp change via the easy access lamp chamber, the instrument is also able to measure low ppt levels of As, Se, Sb, Bi and Te. The instrument combines the advantages of vapour generation techniques which removes most interference with the sensitivity and selectivity of atomic fluorescence spectrometry. Atomic fluorescence spectrometry gives the added advantage of excellent linearity which in this case is over 5 orders of magnitude. Detection levels of 10ppt for As and Sb and 2ppt for Se are readily achieved. With the use of an optimised multi-reflectance filter detection levels of 10ppt can also be realised for Te and Bi.