INFLUENCE OF FIRE IN NATURAL ECOSYSTEMS ON MIGRATIVE ABILITY OF HEAVY METALS, METHODS OF SORPTION-SPECTROPHOTOMETRIC DETERMINATION

Abstract

Purpose. Development of methods for sorption-spectrophotometric and atomic-emission determination of hazardous toxicants in order to increase the reliability of monitoring pollution parameters and assess possible future adverse consequences for humans and the environment. Methodology. Sorption-spectrophotometric and atomic-emission determination of Cu (II), Ni (II), Cd (II), Pb (II), Al (III), Fe (III), in soils degraded due to fires, using sorbents based on silica gel, sequentially modified with polyhexamethylene guanidine and arsenazo-I salts, which can be used for simple and fast methods for the determination of heavy and transition metals. Findings. Identification of chemical pollution by heavy metals in degraded soils as a result of tegogenic activity, fires, climate change for making the necessary management decisions. Originality. Sorbents for the group extraction of heavy metal ions were obtained by the method of non-covalent modification of the silica gel surface with polyhexamethylene guanidine and a triphenylmethane sulfonyl dye. Practical value. Techniques have been developed for the sorption-spectrophotometric and atomic-emission determination of Cu (II), Ni (II), Cd (II), Pb (II), Al (III), Fe (III) using silica gel, sequentially modified with salts of polyhexamethylene guanidine and arsenazo I, which can be used for simple, rapid test methods for determining the migration capacity of heavy and transition metals in technogenically polluted ecosystems and will make it possible to make scientifically based decisions on the priority of the implementation of environmental protection measures. To determine the microquantities of the ions under study, it is advisable to use fine-grained silica gel, and coarse-grained silica gel – to determine higher concentrations of the tested ions. Сonclusions. The paper proposes methods for the group sorption - spectrophotometric determination of Cu (II), Ni (II), Cd (II), Pb (II), Al (III), Fe (III) in the main components of the environment (soil and natural waters) on based on sorbents modified with specific analytical reagents, which is one of the promising directions for increasing the sensitivity and selectivity of analysis. References 15, tables 2, figures 5.