Release:Bulletin of Tyumen State University. Ecology (№12). 2014
About the authors:Tatyana A. Kremleva, Dr. Sci. (Chem.), Professor, Department of Organic and Ecological Chemistry, University of Tyumen; firstname.lastname@example.org
Abstract:The aim of this work is to determine the stability of small lakes concerning the processes of acidification by calculating the buffering capacity of natural water. The decrease of pH in natural waters is caused by the arrival of acidifying sulfur and nitrogen oxides in the atmosphere and in water. Acidification of reservoirs has extremely negative consequences, promotes admission of heavy metals, changes the ionic composition of water, and reduces the ability of natural waters to self-regeneration. The low-mineralized water of small lakes of the northern regions is particularly vulnerable to acidification processes. The criteria for stability of natural waters are the indicator of acid-neutralizing capacity, the level of hydrocarbons, and the value of the buffer capacity of natural waters. To calculate the buffer capacity in this paper we use the following indicators of the chemical composition of water: the pH value (pH), organic content (TOC) and inorganic (TIC) forms of carbon. Concentrations of conjugated forms of natural components of acid-base systems are calculated on the basis of representations of the acid-base equilibria in solutions of carbonic acid and humic acids. The total buffer capacity of natural waters is calculated as the sum of humic and hydrocarbonate buffer capacity. The paper shows that the critical value is the value of the buffer capacity of 15-20 μeq/dm3. For 9 lakes of Purovsky region (Yamalo- Nenets Autonomous Okrug) buffer capacity is calculated. On the basis of these data we determine which reservoirs are the most stable and vulnerable to acidification.
1. Lurie, Yu.Yu. Spravochnik po analiticheskoi khimii. Izd. 4-e [A handbook of analytical chemistry. 4th ed.]. Moscow, 1971. 456 p. (in Russian).
2. Potapova, I.Yu., Lozovik, P.A. Assessment of the resistance of water bodies of Karelia to acidification according to buffer capacity and acid-neutralizing capacity [Otsenka ustoichivosti vodnykh ob,,ektov Karelii k zakisleniiu po bufernoi emkosti i kislotoneitralizuiushchei sposobnosti]. (Vodnaia sreda Karelii: issledovanie, ispol'zovanie, okhrana. M-ly II respublikanskoi shkolykonferentsii molodykh uchenykh (20–21.02.2006) (Water environment of Karelia: research, industry, protection. Proceedings of the II Republican school-conference of young scientists (20-21.02.2006)). Petrozavodsk, 2006. Pp. 93-98. (in Russian).
3. Dinu, M.I. Vliianie funktsional'nykh osobennostei gumusovykh veshchestv na formy nakhozhdeniia metallov v prirodnykh vodakh [The influence of functional characteristics of humic substances on the deportment of metals in natural waters]. Tyumen, 2012. 168 p.(in Russian).
4. Evans, C.D., Monteith, D.T., Reynolds, B., Clark, J.M. Buffering of recovery from acidification by organic acids. Sci. Total Environ. 404. 2008. Pp. 316-325.
5. Vasiliev, V. P. Analiticheskaia khimiia: v 2 kn. Kn. 1: Titrimetricheskie i gravimetricheskii metody analiza [Analytical chemistry: in 2 vols. Vol. 1: Titrimetric and gravimetric methods of analysis]. Moscow, 2002. 368 p. (in Russian).
6. Oliver, B.G., Thurmann, E.M., Malcom, R.L. The Contribution of Humic Substances to the Acidity of Natural Waters. Geochim. Cosmochim. Acta. 1983. 47. Pp. 2031-2035.7. Osnovy analiticheskoi khimii: v 2 kn. Kn. 1. Obshchie voprosy. Metody razdeleniia [Fundamentals of analytical chemistry: in 2 vols. Vol. 1. General issues. Separation methods] / Ed. by Yu.A. Zolotov. Moscow, 2000. 351 p. (in Russian).
8. Lozovik, P.A. Gidrokhimicheskie kriterii sostoianiia poverkhnostnykh vod gumidnoi zony i ikh ustoichivosti k antropogennomu vozdeistviiu (Avtoref. diss. dokt.) [Hydrochemical criteria of condition of surface water humid zone and their resistance to anthropogenic impact (Extended Abstract of Doct. Diss.)]. Moscow, 2006. 59 p. (in Russian).9. Lozovik, P.A. Resistance of water reservoirs to acidification depending on their specific catch land, by the example of lakes and rivers of the basin of the river Shui (Onega). Vodnye resursy — Water resources. 2006. Vol. 33. № 2. Pp. 188-194. (in Russian).
10. Moiseenko, T.I., Gashkina, N.A. Formirovanie khimicheskogo sostava vod ozer v usloviiakh izmenenii okruzhaiushchei sred [The formation of the chemical composition of lake waters in terms of environmental change]. Moscow, 2010. 268 p. (in Russian).
11. Nenonen, M. Report on acidification in the arctic countries: Man-made Acidification in a World of Natural Extrems / The State of the Arctic Environment. Rovaniemi, Finland. 1991. Pp. 7-81.