Abstract
A new spectrophotometric method for the determination of palladium with chromal blue G (Color Index 43835) and cetyltrimethylammonium chloride is described. The sensitivity of the color reaction between palladium and chromal blue G is greatly increased in the presence of cetyltrimethylammonium chloride. The palladium complex has maximal absorbance at pH 3.2–3.8 and at 670 nm. Beer's law is obeyed over the range 0.08–1.4 p.p.m. palladium; the molar absorptivity is 1.01 · 10 5 l mol -1 cm -1 at 670 nm and the sensitivity is 1·10 -3 μg Pd cm -2. The mole ratio of palladium and chromal blue G in the complex in the presence of cetyltrimethylammonium chloride is 1:3. Only scandium interferes when sodium fluoride is used as masking agent.
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