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目的:探讨缓冲药剂对高铁酸盐的稳定性。方法:将高铁酸盐溶液与不同浓度的缓冲药剂、NaOH溶液混合,在低温下避光保存,对吸光度定时测量,对其分解速率进行比较分析,从中筛选出对高铁酸盐稳定性作用最佳的添加剂,同时,确定最佳浓度比和体积比。结果:经实验研究,高铁酸盐与氢氧化钠溶液混合,浓度越高,体积比越大,且高铁酸盐的分解速率也越低,在添加缓冲剂时,碳酸氢钠与氢氧化钠的浓度比为2∶1,其中,以高铁酸盐的100倍浓度为宜,此时的添加效果最好,另外,磷酸盐缓冲剂的稳定效果次之,其中,浓度以50倍以宜,其他的浓度都会增加高铁酸盐的分解速率。结论:高浓度碱液能够抑制高铁酸盐的分解,而碳酸盐则对高铁酸盐的分解具有缓释作用,这为高铁酸盐的长期保存提供了有效的实验依据。
Objective: To investigate the stability of buffer agent to ferrate. Methods: The ferrate solution was mixed with different concentration of buffer agent and NaOH solution, stored in dark at low temperature, measured absorbance regularly and compared its decomposition rate, and the best effect was found on the stability of ferrate Of the additive, at the same time, determine the optimal concentration ratio and volume ratio. Results: The experimental study, ferrate mixed with sodium hydroxide solution, the higher the concentration, the greater the volume ratio, and the lower the rate of ferrate decomposition, when adding buffer, sodium bicarbonate and sodium hydroxide Concentration ratio of 2: 1, of which 100 times the concentration of ferrate is appropriate, this time the best addition effect, in addition, the stability of the phosphate buffer followed, in which the concentration of 50 times the appropriate, other The concentration will increase ferrate decomposition rate. CONCLUSION: High concentration of lye can inhibit the decomposition of ferrate, while carbonate has slow release of ferrate, which provides an effective experimental basis for the long-term preservation of ferrate.