Spectrofluorimetric determination of trace amounts of cadmium with 2,4-dihydroxyacetophenone benzoylhydrazone

A new fluorescent reagent 2,4-dihydroxyacetophenone benzoylhydrazone （DHAPBH） was synthesized and its ionization constants were established spectrophotometrically. The fluorescent reaction of this reagent with cadmium was studied. The cadmium ion can form a stable binary chelate with DHAPBH, having a mole ratio of 1 ：2 in the pH range of 3.6-4.4. Based on this chelation reaction, a highly sensitive spectrofiuorimetric method was developed for determination of trace amounts of cadmium in a water-ethanol （7：3 in volume ratio） medium at pH = 4.0. Under these conditions, the Cd-DHAPBH complex has excitation and emission maxima at 306 and 437 nm, respectively. The linear range of the method is from 0.36 to 140μtg·L^-1 and the detection limit is 0.27 μtg·L^-1 of cadmium. Interferences of other ions were studied. The method was successfully applied to the determination of cadmium in mineral water, tap water, fiver water, and wastewater.

2,4-二羟基苯甲醛缩氨基硫脲合Cu(Ⅱ)、Zn(Ⅱ)、Ni(Ⅱ)、Fe(Ⅱ)的合成和表征及杀菌活性

氨基硫脲类配合物具有显著的药理作用,我们合成了2,4-二羟基苯甲醛缩氨基硫脲与Cu、Ni、Zn、Fe形成的配合物,对产物进行了元素分析和多种光谱的图谱解析,推断出它们的组成和配位状态,还进行了超氧自由基的抑制率实验及杀菌活性研究。

2,4-二羟基苯乙酮缩氨基硫脲与铜锌、钴、镍离子配合物及其抑菌活性

合成和表征了２，４－二羟基苯乙酮缩氨基硫脲与铜、锌、钴、镍离子的７个配合物，并测试了配体和配合物的抑菌活性。结果表明：２，４－二羟基苯乙酮缩氨基硫脲是通过Ｓ原子，亚胺基Ｎ原子和邻位羟基Ｏ原子与金属离子形成配合物，配合物及配体对受试菌均有抑菌活性，配合物的抑菌活性均强于自由配体。

载体修饰的碳糊钴离子选择性电极的研究

以2,4-二羟基苯乙酮缩氨基硫脲为载体的碳糊钴离子选择性电极被研制出来。该电极对Co2+呈现近Nernst电位响应性能,电极斜率为26.9 mV/decade,线性范围为4.8×10-7～1.0×10-1mol.L-1,检测下限2.0×10-7mol.L-1。电极的pH值应用范围为2.5～5.0,对Co2+具有良好的选择性。电极的响应时间为1min,在使用一个月后其电极电位响应性能未见下降。运用紫外-可见光谱技术初步探讨了电极响应机理。将电极用于实际样品中钴含量的分析检测,其结果令人满意。