本文报道了一种对Pd(Ⅱ)有高灵敏和选择性的新试剂2—(2—苯并噻唑偶氮)—4—甲基—5—磺甲氨基苯胂酸(BTASTA)。试剂在较高酸度的硝酸介质中能与钯形成稳定的蓝色配合物,其组成为Pd(Ⅱ):BTASTA=1:1,最大吸收波长为692nm,表观摩尔吸光系数为5.9×10~4,钯的浓度在0～60μg/25ml服从比耳定律,可以允许大量的离子包括贵金属离子共存。用于镍—铝催化剂,钯—碳催化剂,铜—镍合金,贵金属氯化渣中钯的测定,结果满意。 In this paper, a new reagent, 2- (2-benzothiazolylazo) -4-methyl-5-sulfonamidazo acid (BTASTA), which has high sensitivity and selectivity to Pd (Ⅱ) The reagent can form a stable blue complex with palladium in high acidity nitric acid medium. Its composition is Pd (Ⅱ): BTASTA = 1: 1, the maximum absorption wavelength is 692 nm, the apparent molar absorptivity is 5.9 × 10 ~ 4, palladium concentration 0 ~ 60μg / 25ml obey Beer’s law, allowing a large number of ions, including the coexistence of precious metal ions. For nickel - aluminum catalyst, palladium - carbon catalyst, copper - nickel alloy, palladium chloride in precious metal determination with satisfactory results.