铝（Ⅲ）－铬蓝黑B络合物吸附波的研究

Study on Adsorptive Wave of Complex of Aluminium and Eriochrome Blue Black B

在ＰＨ４．１０ＨＡＣ～ＮＨ４ＡＣ缓冲溶液中，铬蓝黑Ｂ在单扫描示波极谱仪上产生四个导数极谱波：Ｐ１、Ｐ２、ｐ３、Ｐ４，其峰电位分别为一０．４４Ｖ、一０．５２Ｖ、一０．５９Ｖ、一０．６７Ｖ（ＶＳ·ＳＣＥ）．加入ＡＩ（Ⅲ）后，Ｐ波明显增高，其他波高不变．在０．００４～０．１２ｍｇ／Ｌ范围内，ｐ波高与Ａｌ（Ⅲ）浓度成正比．试验表明，该极谐波属络合物吸附波．本法巳用于自来水和铝用具煮沸水中微量铝测定，结果满意。

n the buffer solution of acetic acid-ammonium acetate (pH4. 10),the reductivewave (p2) of Eriochrome Blue Black (EBBB) was observed at -0. 52v(vs. SCE) and in thepresence of Al(Ⅲ ) the wave p2 was moved to -0. 53v(vs. SCE). The peak height of p2 increased remarkably. The change of peak height of p2 with concentration of Al(Ⅲ ) is linear inthe range of 0. 004 to 0. 12mg/L. The detection limit was 0. 002mg/L. The mechanism ofelctrode reaction was studied in ditail. The wave (p) was confirmed to be an adsorptivecomplex wave. The method has been used for determinating the trace aluminium in water.