【摘要】 合成了新显色剂1-偶氮苯3-(6-甲氧基-2-苯并噻唑)-三氮烯(ABMBTT),并用元素分析和红外光谱法对其分子结构作了验证。研究了该试剂与汞的显色反应,在pH 9.5~11.0的硼酸盐缓冲介质中,有Triton X-100存在下,ABMBTT与汞反应形成2∶1的橙红色络合物,其最大吸收波长在520 nm处,表观摩尔吸光系数为1.50×105L.mol-1.cm-1,汞的浓度在0~20μg/25 mL范围内符合比耳定律。在焦磷酸钠存在下,常见离子基本不干扰。已应用于工业废水中微量汞的测定,测定结果的RSD小于3.5%,与二苯硫腙光度进行验证,结果吻合。更多还原

【Abstract】 A new chromogenic reagent,1-（4-azobenzene）-3-（6-methoxy-2-benzothiazolyl）-triazene（abbreviated as ABMOBTT）,was synthesized and its molecular structure proved by elementay analysis and ultra-red spectrometry.It was found that an orange-red colored complex with mole ratio of（R∶Hg） 2 to 1 by the reaction of ABMOBTT with Hg（Ⅱ） in a borate buffer medium of pH around 10（pH 9.5-11.0） and in the presence of Triton X-100.The absorption maxima was found at 520 nm,where the apparent molar absorptivity was found to be 1.50×10⁵L·mol^-1·cm^-1.Beer′s law was kept in concentration range of 0 to 20 μg of Hg（Ⅱ） per 25 mL of solution.By the addition of sodium pyrophosphate as masking agent,no interference from most of commonly co-existing ions was observed.The proposed method has been used in the determination of mercury in industrial waste water,giving RSD′s less than 3.5%.The analytical results obtained by this method checked very well with the results obtained by the conventional dithizone photometric method.更多还原