Potassium analysis in the part per billion-range in solution by emission flame photometry with an air-acetylene flame should be as routine as sodium analysis in this concentration range.1 In fact, since K is not as ubiquitous as Na, precautions to avoid spurious contamination
of samples should not need to be as stringent. However, conventional flame photometers are generally less sensitive at the detection wave length of 766.5 nm for K. Good photomultiplier tube response at 766.5 nm may require a special tube. In addition, the blaze angle of the grating in a photometer
is often set for optimum performance at much lower wave lengths (typically 250 nm). This means that for trace potassium analysis by emission flame photometry on a general purpose instrument, the grating and photo-multiplier tube would have to be changed. A simple modification of a flame photometer
was devised to avoid these costly and inconvenient changes.
Bell Telephone Laboratories, Inc., Reading, Pennsylvania 19604
Publication date: March 1, 1973
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