Examinations were made on the chelate titration of 3, 4, 5, 6-tetrachloro-3', 4', 5', 6'-tetrahydroxyfluoran methyl ester (Cl-gall-CH
3) using rare earth elements (La, Ce,
Pr
,
Sm
, Nd, Y, Gd), and absorption photometric determination of rare earth elements using cetylpyridinium bromide and Cl-gall-CH
3. It was thereby found that rare earth elements can be determined by absorption spectrophotometry, in the amount approximately 0-4 μg/ml, by using Cl-gall-CH
3-rare earth element complex (2 : 1 molar coordinate) with the metal reagent of La, Ce, and Y, at pH 7.1, using absorptions at 655 mμ (Ce), 660 mμ (Gd), and 670 mμ (La,
Pr
,
Sm
, Nd, Y).
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