新叠氮试剂QTBAS与铜、钴、镍离子显色反应的研究

Study on the Colour Reactions of New Azide Reagent QTBAS with Cu(Ⅱ),Co(Ⅱ),and Ni(Ⅱ)

新叠氮试剂ＡＴＢＡＳ在ＮａｏＨ－Ｎａ２Ｂ４Ｏ７（ｐＨ１０．０）的缓冲溶液中，在表面活性剂ＣＴＭＡＢ存在下，能与铜、钴、镍离了发生显色反应。ＱＴＢＡＳ在此条件下最大吸收峰位于４５０ＮＭ，与铜离子形成紫红色的络合物，其最大吸收波长为５８５ｎｍ，表现摩尔吸光系数εＣｕ＝６．９４×１０４；与钴、镍离子形成蓝色络合物，其最大吸收波长均为５９５ｎｍ，其表现摩尔吸光系数εＣｏ＝６．３３×１０４和εＮｉ＝５．２２×１０４．研究了该显色反应发生的条件及同时测定了两干扰组分的含量，考察了其它常见阴阳干扰离子的影响，反应具有很高的选择性。

A new azide reagent(QTBAS) reacts with Cu(Ⅱ),Co(Ⅱ) and Ni(Ⅱ) in NaOH-Na2B4O7(pH10.0) buffer solution in the presence of CTMAB.The wavelength of reagent maximum absorption is at 450nm and violet-red Cu-complex's maximum absorption is at 585nm with apparent molar absorptivity(ε) of 6.04 x 104.Co(Ⅱ) and Ni(Ⅱ) form blue complexes with QTBAS.The apparent molar absorptivities(ε) of Co-complex and Ni-complex are 6.33×104 and 5.22×104,respectively.The optimum operating condifions are established and two component of Cu-Co or Cu-Ni are determined by a linear regression method of multiwavelength data. The effect of foreign ions are investigated and the method is high selective.