Synthesis Of DSOD And DDOD And Their Application On Determination Of Heavy Metal Ions

Since the middle of 19th century, the pollution of heavy metal ions has concerned the people of the world. In our country, Monitoring the concentration of the heavy metal ions is one of the most important content in the circumstance protection and industry. The fluorimetric method on detecting the heave ions is still active and developing for its low cost and high sensitivity. So studying the compounds that has good selectivity and strong fluorescence is necessary.The acylhydrazone compound, as a kind of shiff base, is studied in many fields for its properties of biological and pharmacological activities and. two reagent of N'1,N'2-bis[(1E)-(2-hydroxyphenyl)methylene]- ethanedihydrazide (DSOD) and (1Z,2Z)-N1,N2-bis[(1E)-(2,4-dihydroxyphenyl)methylene]ethanedihydrazonic acid(DDOD) were composed. Four heavy metal ions complexes of with DSOD and DDOD were synthesized and characterized on the basis of elemental analyses, 1R, UV spectra and DTA-TG analyses. A highly sensitive fluorimetric method on determination of trace amounts of zinc was proposed base on the reaction between Zn²⁺ and DSOD in ethanol at pH 7.00 . The linear range of the method was 0³5.0μ g/L with a detection limit of 0.50μ g/L . The interferences of 16 common ions was investigated and the results showed that the DSOD had a good selectivity . The analytical results on detecting trace amounts of Zn²⁺ in zinc rich salt and hair by this method were satisfaction . The fluorimetric reaction between Zn²⁺ and DDOD is most effective in ethanol at pH 5.10 . The linear range of the method was 0²6.0 μ g/L with a detection limit of 0.10 μ g/L . The interferences of 16 common ions was investigated and the results showed that the DDOD had a good selectivity .