SU597939A1 - Method of mineralization of organic substances - Google Patents

Description

(54) METHOD FOR MINERALIZATION OF ORGANIC SUBSTANCES Chi. The process of mineralization and a rescues and substances lasts 15-17 meme | 3 | .. Known demolition is not devoid of residues. Thus, the presence of three sections in a special electric oven, which are included in series, significantly increases the mineralization time ) and the possibility of chipping gaseous decomposition products of a substance is not completely eliminated. In addition, the reaction mass is heated by contact from the electrospiral to the wall of the tube, from the tube to the reaction mass, and from the periphery of the reaction mass to its center. These disadvantages significantly limit the application of the method. The purpose of the invention is to develop a method for analyzing chemical substances in a reducing manner, allowing Yunhego to significantly improve the accuracy and shorten the analysis time. The goal is achieved by the fact that the decomposition of the sample being analyzed is carried out by high frequency currents (HDTV) in the presence of powdered iron as a reducing agent. Powdered iron is compressed into tablets with a sample of the analyte. Using the iron properties of powdered iron, it is possible to carry out instant mineralization of the studied objects under the influence of HDTV, i.e., due to the formation of eddy currents in the reaction mixture itself. Thus, high frequency currents mineralize the object under study. The absence of a temperature difference (the reaction mixture is heated by raviomer throughout the whole mass), the use of a compressed tablet from a reducing agent, which has a positive effect on the results of the analysis of c, allows one to reduce the mineralization time from 17 minutes to 25-30 seconds. At the same time, the overshoot of gaseous products is completely excluded. 9,. . . . The decomposition product (melt) is a homogeneous powder, which JierKO undergoes further processing,;. /7рм.иер. A weight (3-10 mg) .L O) With a nitrogen dilution, I cover a tablet with a thin layer of a polyvinyl acetate emulsion for oxygen and from the external medium (nitrogen of air). The tablet prepared in this way for operation is introduced into the working area of the installation of high frequency mark currents. L Under the action of HDTV, an investigation is carried out.;. The substance is mineralized to form a nitride of iron. Reaction by-products are derived from the smallest openings of the tablet. The process of decomposition d; 1its less than one minute. Compared with the known methods, the decomposition reaction rate of the proposed method is reduced by ten times. Further quantitative determination of nitrogen is carried out according to one of the known methods. To do this, the cooled tablet is crushed and quantitatively transferred into a special diffusion device. In the instrument, which is released in the alkali environment, ammonia co. IH4ecTBeHf 0 is absorbed by boric acid deposited on porous material. Having finished the distillation of ammonia, the lid of the pryr is turned over and 5 ml of distilled water is poured. The solution is titrated with 0.01 and. solution of sulfuric acid in the presence of. 1-2 drops of a mixed indicator. The percentage of nitrogen is calculated using the following formula. The table shows the results of the quantitative determination of nitrogen in organic and biological substances. Absolute accuracy is ± 0. In NaphthionoBas acid 15.75 6, OZ

Acetan number L5OD14, 60 10.30 10.39 +0.09

12.66 15.04 14.97 -0.07

ANILINE

In biological substances

Corn

rice 13.51

2.12-6.12

7.33 10.3010.35 -to.05

4.45 15.0415.02 - 0.02

2.24 organic substances 6.31 + O, 288.58 6, OZ5.9 O -0.13