The main content of barium nitrate was measured, and the barium ions were determined. Daily testing is more commonly used in chemical analysis of weight analysis method (including barium sulfate gravimetric method, Barium chromate gravimetric method). Barium sulfate gravimetric method, because the impurity ions (strontium ions) and the main determination ion (barium ion) to precipitate the ability of similar, resulting in a significant reduction in detection accuracy, and barium chromate gravimetric method, although can accurately determine the content of barium ions, but the method process is long, cumbersome operation, slow. The present national standard gb/t1613--2008 the barium chromate capacity method overcomes above insufficiency, and the operation is simple, fast, accurate, adapts to the production need. The superiority of this method is proved by both theory and experiment.
1. 3 Barium chromate Volumetric Method 1. 3. 1 Methods The method is different from the barium chromate gravimetric method, add dichromate May 2009 Guo Lan and so on: Analysis method of barium nitrate main content 57 potassium to produce barium chromate precipitation, filtration, the use of iodine titration of excessive CR, at the same time do blank test, according to two titration difference, the calculation of barium nitrate content. 1. 3. 2 Method The principle of this method is the same as that of barium chromate gravimetric method, which can accurately determine the BA content, and has the advantages of time and simplicity compared with the method of barium chromate gravimetric. 2 Test control 1) in order to verify the correctness of the theoretical analysis, the barium sulfate gravimetric method, Barium chromate gravimetric method and Barium chromate volumetric method were used to test. The results showed that there were no difference in 3 methods when the purity of barium nitrate was determined, while the samples with more impurities (Sr, Ca) were different in 3 methods, and the test results were shown in table 1. Table 1 Barium sulfate gravimetric method, Barium chromate gravimetric method, Barium chromate volumetric method for determination of the main content of barium nitrate% barium sulfate gravimetric method Barium chromate Gravimetric method Atomic absorption analysis of barium chromate volumetric method
The results showed that barium sulfate gravimetric method was very high, and barium chromate Gravimetric method was close to the determination of barium chromate volumetric method, which was consistent with the previous theoretical inference. 2 in order to verify the difference of barium sulfate gravimetric method and Barium chromate volumetric method in real industrial product inspection, barium sulfate gravimetric method will conceal the true quality, and the results obtained by Barium chromate volumetric method are the true purity of barium nitrate. Table 2 The results of the determination of barium chromate volumetric method decreased with the increase of the number of Mother liquor circulation, which was in accordance with the actual production. 3 conclusion The above analysis shows that barium chromate volumetric method for the determination of the main content of industrial barium nitrate, compared with other analytical methods, has the characteristics of simple operation, fast and easy operation. The method is accurate and reliable and meets the requirements of daily production inspection, and is suitable for industrial barium nitrate detection.