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在PH9.0的氨水-氯化铵缓冲溶液中,稀土(Ⅲ)与三溴偶氮胂在-0.69V(vs.SCE)处产生一灵敏的极谱波,二次导数峰高与稀土浓度在3.O×10~(-8)~9.0×10~(-7)mol·L~(-1)范围内呈线性关系,检出限为2.O×10~(-8)mol·L~(-1).探讨了该极谱波的性质和电极反应机理.用此法测定了球墨铸铁中的稀土总量,结果满意.
The rare earth (Ⅲ) and tribromoarsenazo produced a sensitive polarographic wave at -0.69V (vs.SCE) in the aqueous ammonia-ammonium chloride buffer solution of pH 9.0. The second derivative peak height was in agreement with the rare earth concentration The linear range was within the range of 3.0 × 10 -8 -8.0 × 10 -7 mol·L -1 with the detection limit of 2.10 × 10 -8 mol · L ~ (-1) .The properties of the polarographic wave and the electrode reaction mechanism were discussed.The total rare earth content in the ductile iron was determined by this method, and the results were satisfactory.