Abstract: The invention contemplates apparatus for simultaneous photometric observation of a plurality of elements in a liquid sample, wherein a dilute solution of the sample is atomized and fed to an elongate steady flame and wherein light from a hollow-cathode lamp, and containing at least one narrow-band emission line of one of the elements to be determined, is directed through the flame; plural photoelectric receivers, each with an associated filter unique to a line characteristic of a different specific element to be determined, are disposed to respond to light passing through the flame or to light emitted by the flame, as the case may be. The detected outputs of the receivers are fed to a computer for evaluation, the outputs of emission receivers being first electronically processed for the effective removal of "dust flashes" in the flame.