One goal in atomic multi-elemental analysis is the abilityto rapidly analyse a large number of elements over a wideconcentration range. Therefore an ideal spectrophotometershould detect many wavelengths simultaneously .with widespectral coverage, good sensitivity and should exhibit alarge linear dynamic range. Currently "direct readers" whichemploy individual slits and photomultiplier tube detectors(PMT) for each wavelength are the most commonly used.This is due to the numerous desirable characteristics of PMT’ssuch as their high sensitivity and long, linear dynamic range.However, these instruments suffer from several significantdisadvantages such as a limited number of channels, difficultyin wavelength adjustment and high cost.