1.Studies On The Determinations Of The Contents Of Nitrogen In The Coexistence Of Amide Nitrogen And Nitric Nitrogen 2.Researches On The Production Of Chlorine-free Chlorine Dioxide By Reducing Method And Joint Producing Inorganic Salts And The Stabi

When we used the formol-H2SO4 method to titrate the determinations of the content of amide nitrogen in urea nitrate, in which there is coexistence of amide nitrogen an nitric nitrogen, it was found that the results of amide nitrogen obtained were only equal to half of the theoretical values. It was deduced that the cause of this error is due to a side reaction happened among urea, nitrate ion and sulfuric acid, leading to a quantitative loss of urea. The mechanism of the deduced side reaction was verified experimentally by gasometry of the nitrogen liberated in the reaction. Based on the experimental facts, a modification for the calculation of results of conventional titrimetric method was proposed, which was proved to be more reasonable. The effects of analytical conditions, i.e. the temperature in the decomposition by H2SO4 and the time for decomposition were also studied, and optimum conditions of analytical procedure were thus presented. We also improved the conventional formol-H2SO4 titrimetric method, and applied it into the determinations of the contents of amide nitrogen and total nitrogen in urea nitrate metal complexes. Using the quantitative relationship of side reactions among urea, nitrate ion and sulfuric acid, we analyzed the content of amide nitrogen in urea nitrate metal complex by the use of formol titration method. We also experimented many times from aspects such as reaction temperature, reaction period, and so on. We had got the most suitable analytical conditions and a series of data to certify thefeasibility of this method. We also applied this urea-formol titric method into the determinations of the contents of nitric nitrogen in nitrate. We added certain urea whose content of amide nitrogen was known into the nitrate. From the losing of amide nitrogen we could calculate the content of nitric nitrogen. The analytical conditions such as reaction temperature, reaction period, and so on also had been studied. The most suitable analytical conditions and a series of data had been researched, to certify the feasibility of this method.