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Traditionally a complex of operations is required for estimating an ecological situation, namely, sampling in a region, preparing samples for analys,is, analysing samples in a laboratory, processing the analysed data and presenting a conclusion on the presence of the substance of interest in the examined sample. As a result we have a considerable interval between the time of ingress of a specific substance into a monitored region and the statement of this fact with determination of the value of concentration. Meanwhile, during the considered interval of time the situation in the region may change and the previously taken sample will not correspond to a new sample, and so on. Such situation dictates the necessity of continuous monitoring of the ecological situation allowing at any moment of time to judge about the appearance of one or another substance which is a product of technological discharge. As a rule, methods of monitoring and determining concentration of substances in laboratory or field conditions are based on using the results of measuring transmission through an examined medium or scattering of radiation propagating in it. The methods of monitoring with the usage of mirror reflection for natural investigations are far from being well-developed, though their potential possibilities are great. In fact, while considering deposition of condensate of a substance mixture upon mirror-reflecting surfaces of transparent crystals (glasses) or of a solid phase of this condensate upon mirror surfaces of a metal, the known methods [1,21 can be used to determine, the optical constant n(A) and K(A), i.e. indices of refraction and absorption, on the basis of the coefficient of mirror reflection under normal radiation incidence with the wavelength ).
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