高铁酸盐的稳定性研究

Study on Stability of Ferrate(VI)

目的为延长高铁酸盐的保存时间,筛选出对高铁酸盐起到最佳稳定作用的添加剂,并确定其添加量.方法将高铁酸盐溶液与不同浓度添加剂混合,低温避光保存,定时测其吸光度,比较分解速率.结果投加LiNO3、Mg(NO3)2、Na2SiF6、Na2C2O4的分解率较空白样的分解率降低;Na2SiF6、Na2C2O4最佳投加量分别为0.5%、1.0%,10 d后的分解率较空白样的分别降低25.3%、15.55%;LiNO3、Mg(NO3)2的最佳投加量为1.5%,10 d后的分解率较空白样降低30.36%、17.26%;投加NaNO3的分解曲线处于空白样附近;投加Ba(NO3)2、Na2SO4的分解曲线处于空白样的上方.结论 Li+、Mg2+、SiF62-、C2O42-能抑制高铁酸盐分解;NO3-对高铁酸盐溶液的稳定作用没有影响;Ba2+、SO42-能加速分解高铁酸盐溶液.

The aim of this paper is to extend the preservation time of ferrate through identifying the additives having the best stable effect to ferrate and determining the volume of addition.We try to mix the ferrate solution with additives with different concentrations respectively,and preserve the solutions in the hypothermia and dark,measure the absorbance whenever necessary and compare the decomposition rates.Results of the experiments show that the solutions which LiNO3,Mg（NO3）2,Na2SiF6,Na2C2O4 are added into respectively have lower decomposition rates than that of the blank sample.Furthermore,the optimal additive volume of Na2SiF6 and Na2C2O4 are 0.5% and 1.0% respectively and the decomposition rates decrease respectively by 25.3% and 15.55% after 10 days relative to that of the blank sample;the optimal additive volume of LiNO3 and Mg（NO3）2 are both 1.5% and the decomposition rates when compared with that of the blank sample have decreased by 30.36% and 17.26% respectively after 10 days.Decomposition curve of adding NaNO3 is close to that of the blank sample and those of adding Ba（NO3）2 and Na2SO4 respectively are both higher than that of the blank sample.In conclusion,Li＋,Mg2＋,SiF62-and C2O42-can inhibit the decomposition of ferrate;NO3-has no effect on the stability of ferrate solution;Ba2＋,SO42-can accelerate the decomposition of ferrate solution.