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在酸性介质中利用钯与碘化钾能立即生成琥珀红色的稳定络合物, 直接进行光度法测定镍基堆焊材料中的钯.络合物在一股无机酸中均可形成,但最适宜的介质为硫酸,酸度的适用范围较宽(保持在0.25%以上硫酸即可),显色剂的加入量应足够,过量显色剂并不影响测定.络合物最大吸收波长在410纳米处,在50毫升显色液中至少可允许10毫克镍,5毫克铁,1毫克钴、铬、钼、铝、钒、锗,0.75毫克铌,0.5毫克锰、钛,0.25毫克钨、铜、硼和0.025毫克铂等存在,钯量在0～600微克/50毫升范围内有良好的线性关系.
Palladium and potassium iodide in acid medium can be immediately generated amber red stable complexes, direct spectrophotometric determination of nickel-based surfacing materials in the palladium complex can be formed in a mineral acid, but the most appropriate The medium is sulfuric acid, and the applicable range of acidity is wide (the sulfuric acid can be maintained at 0.25% or more), the amount of the chromogenic agent should be sufficient, and the excess of the chromogenic agent does not affect the determination. The maximum absorption wavelength of the complex is at 410 nm, At least 10 mg of nickel, 5 mg of iron, 1 mg of cobalt, chromium, molybdenum, aluminum, vanadium, germanium, 0.75 mg of niobium, 0.5 mg of manganese, titanium, 0.25 mg of tungsten, copper, boron and 0.025 mg of platinum and the like. The amount of palladium has a good linear relationship in the range of 0 to 600 μg / 50 ml.