Method for marking chemical substances

FIELD: engineering of technical means for marking chemical substances, possible use for marking any substances.

SUBSTANCE: an admixture is introduced into substance being marked, of same chemical composition as substance, but with increased content of rare stable isotopes (carbon, oxygen, nitrogen, hydrogen) of several elements present in composition of substance being marked. Used as marking code is value of concentration of rare isotopes introduced to substance being marked.

EFFECT: creation of universal, safe to use marker, useable for reliable identification of any substances without affecting their consumer qualities.

3 cl

 

The invention relates to chemical industry, hardware labeling of chemicals numeric code to identify the manufacturer of chemicals and can be used for marking any substances for protection against fakes ranging from drugs, to motor oils, as well as enterprises producing explosives (he), to prevent theft of EXPLOSIVES from manufacturers and facilitate acts of terrorism with the use of EXPLOSIVES.

There is a method of marking CENTURIES with marking additives, based on the Appendix to the marked substance additives metalloorganic, in which the plastic and elastic BB add ORGANOMETALLIC compound, which is then detected in the gas phase using selective detectors, see RU # 2134253, 06 AT 23/00, 1996.

The disadvantage of this method is that the supplements reduce the concentration of marked substance, thereby impairing its properties, and that the selection marking additives requires the study of their impact on compatibility with marked substances.

There is a method of marking EXPLOSIVES with radioactive additives, which marked the substance add radioactive isotopes, see US No. 4019053, G 21 H 5/02 1975.

The disadvantage of this method is that ve marked esto becomes radioactive.

The closest technical solution is a way of labelling of chemicals marking additives in the form of molecules with altered isotopic composition, namely the change of the number of carbon13With, see FR No. 2673291, G 01 N 30/72, however, to identify the manufacturer labeled substances, transforms this substance in CO2(i.e. burn), study of the chromatographic method the resulting combustion products and determine the concentration of13With the obtained CO2.

The disadvantages of this method are, first, that the marking additive modifies the chemical composition, i.e. labeled substance will differ from substance to labeling. The second drawback is that you need to make a significant number marking additives to significantly increase the concentration of the isotope13C. in Addition, if the labeled substance formed mixture or entered into chemical reactions with other substances, the identification of the obtained product is impossible.

These issues are a consequence of the fact that the marking substances chemical properties differ from the properties of the marked substance that is a factor of deteriorating consumer qualities of a labeled substance, and the result of the method of marking and subsequent identification by what redstem translation labeled substances in CO 2.

The technical result of the proposed solutions is to use as marking substances of the same chemical substances with different isotopic content, the chemical composition of the mixture do not change. The labeled substance or residue after use carry the code laid down by marking that extends the functionality of the method.

The technical result is achieved in that in the method of marking substances, which consists in the introduction of marking additive in the form of a substance with a high content of rare stable isotope that is present in the marked substance, previously made by chemical additive of the same composition that marked the substance with a high content of rare stable isotope of one or more of the elements included in the composition of the marked substance, the concentration of marking additives in marked substance is ˜10-6to ˜10-1by weight; in multicomponent marked substance is injected additive, which is one of components of multicomponent marked substance, but with a high content of rare stable isotope; pre-enter the isotope only in one part of the molecule at the stage of manufacture marking additives; give some to the AVOK substance, but with different isotopic composition.

The proposed method labelling of chemicals as follows. Separate the isotopes of the elements included in the marked substance, natural composition which includes rare stable isotopes. For example, separate the isotopes of carbon, oxygen, nitrogen, and others, for the production of rare isotopes in pure form, are then chemically preparing isotopically enriched marked substance. It is marking additive. The marking is made by adding to a marked natural substance isotope enriched substance of the same chemical composition that marked the substance (marking additive). For isotopic changes using stable isotopes of common elements such as carbon, oxygen, nitrogen, hydrogen and others, which are usually present in almost all substances requiring labelling. The natural content of these elements is common isotopes12(98,892%),16On (99,759%),14N (99,635%),1N (99, 98), and rare isotopes of the same elements13(1,108%),17On (0,037%),18On (0,204%),15N (0,365%),2N (0,02%). The concentration or ratio of concentrations is a code identifying the manufacturer of the substance.

If necessary, identify the labeled substance about swagat, for example, mass-spectroscopic analysis of molecules and/or atoms of a labeled substance and determine the percentage of molecules and/or atoms with different atomic weights. The difference of the content of atomic and molecular weights from natural concentrations do different for each manufacturer marked substance.

The range of concentrations marking additives chosen depending on the accuracy of the analysis. For mass spectroscopic analysis method lower limit is 10-6-10-7. The upper limit of the range defined depending on the economic feasibility of making large concentrations of additives, such as 10-1. There is an alternative to mass-spectroscopic method of analysis for the detection of the isotopic composition of large molecules. It is a way of chromatography, which allows you to separate and detect large molecules of organic compounds with molecular weight greater than 100). The lower bound of the sensitivity of the measurement of the concentration is 10-5-10-6isotopic substances from the mass of the labeled substance.

Consider the application of the method on the example of trinitrotoluene (BB). Its chemical formula: CH3(C6H2)(NO3)3. Its molecular weight in the most probable configuration is 275. The probability with which one mixes to find the molecule, where at least 6 carbon atoms are atoms13With is ˜10-11and the molecule with the atomic weight of 275+6 is less than 10-9. In the manufacturing process of the substance increase the concentration of such molecules, for example up to 10-6(the addition of one gram of isotopic substances per tonne), thereby marking the substance. Every company-the manufacturer has its own concentration or the ratio of the concentration of the rare stable isotopes of common elements, such as the first enterprise-manufacturer adds 0,5·10-6isotopic substances from the mass of the marked substance, second - 1·10-6and the third 2·10-6.

Another example of application of the method of marking the same trinitrotoluene consists in the following. As marking additive is prepared isotope marked substance in which the atoms of carbon -13With a molecular weight of 275+7, and prepare isotope labeling substance in which the atoms of carbon -13And oxygen atoms -18O. the Molecular weight of these molecules - 275+7+18. The natural concentration of these molecules is less than 10-20and the addition of such molecules is determined only by the sensitivity of the mass spectrometer. Marking additive is a mixture of isotopic substances, containing13With and isotopic substances, containing the his 13C and18About in a certain proportion. Every company-the manufacturer corresponds to the ratio of the concentrations of molecules with13With and molecules with13C and18O. for Example, for the first manufacturer to make this ratio is equal to 0.65, for the second of 0.7, for a third - 0,75. In this example, the marking has the advantage in comparison with the previous example. This increases the reliability of the recognition of the manufacturer's marked substance.

Another example of marking the same trinitrotoluene is that marked the benzene ring, which is present in each molecule of TNT. To do this, prepare the cake mix, for example benzene, for the manufacture of marked substances with the presence of rare stable isotope of carbon13C. then make trinitrotoluene using the obtained benzene. This will be marking additive, which is injected at a concentration of from 10-6up to 10-1in marked substance. In this case, instead of13With a benzene ring, you can enter18(NO3to produce HNO3with heavy oxygen18Oh and get as marking additive trinitrotoluene with severe oxygen18Oh, which is injected at a concentration of from 10-6up to 10-1in marked substance. To increase reliability the identification of the manufacturer marked substance to prepare a mixture, consisting of marked substances with different isotopic composition, for example a mixture of molecules of TNT, which in the benzene ring13With and molecules, in which the nitro-group NO3contains18O. Each company-the manufacturer has its own concentration marking additives in the range of 10-6up to 10-1from the mass marked substances, as well as the ratio of the concentrations of these additives.

The examples refer to the isotopic substances with a high concentration of rare stable isotopes that are included with marked substances of items. Isotope separation to obtain a highly concentrated isotopic substances expensive, on the other hand, the examples allow the use of isotope substance in minute amounts, for example not more than one gram per tonne, i.e. the 10-6by mass. Isotope separation is a multistep process, and if it is interrupted in the initial stages, you can get quite a lot of slightly enriched element. This material is used for the manufacture of marked substances, enriched with rare isotope of an element that is part of the marked substance. For example, for the manufacture of marked substances used carbon with increased concentration of13With the first the manufacturer uses to which ncentratio carbon atoms 13With - 0,05, the second - 0.1, the third is 0.15. The lower bound of 0.01 - isotope13With in the natural environment. It increases the flow of isotopic substances, but, on the other hand, obtaining dilute isotopic substances are much cheaper than highly concentrated.

If you want to mark a mixture of substances, introducing rare stable isotopes of common elements only in one of the components of the mixture. Thus the concentration of the isotopic molecules is based on the entire volume of the labeled mixture reduce.

For a more reliable identification of the manufacturer's mark two or more components of the mixture. When this code describing the enterprise-manufacturer, is the ratio of the concentrations marking additives in each of the components of the mixture.

The marking is made without changing the chemical properties of the marked substance that allows the use of labeled substance without additional restrictions associated with the label.

The invention is directed to selection of versatile, safe handling of the marker used for reliable identification of any substances, which does not affect their performance, does not change over time and allows the identification of the company manufacturer's data prophetic is STV, even if the substance has undergone any conversion or formed mixture.

The labeled substance or residue after use carry the code laid down by marking that extends the functionality of the method.

1. A method of marking substances, which consists in the introduction of marking additive in the form of a substance with a high content of rare stable isotope that is present in the marked substance, wherein the pre-manufactured by chemical additive of the same composition that marked the substance with a high content of rare stable isotopes of several elements entering into the composition of the marked substance, the concentration of marking additives in marked substance is ˜10-6to ˜10-1mass.

2. The method according to claim 1, wherein the pre-injected isotope in the portion of the molecule at the stage of manufacture marking additives.

3. The method according to claim 1, characterized in that impose several additives of the same substance with different isotopic composition.



 

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