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<cfResPublDate>2016</cfResPublDate>
<cfVol>Ediția a 19-a,  Book of abstracts</cfVol>
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<cfTitle cfLangCode='EN' cfTrans='o'>Influence of the interaction of calcium carbonate nanoparticles with surface-active substances on the degree of pollution of waters in small rivers</cfTitle>
<cfKeyw cfLangCode='EN' cfTrans='o'>Anionic and cationic surface-active substances; calcium
carbonate; Cetyltrimethylammonium; laurylsulfate; toxicity</cfKeyw>
<cfAbstr cfLangCode='EN' cfTrans='o'><p>This paper presents a continuation of our research of the water pollution in<br />Nistru and Prut Rivers with a series of surface-active substances<br />(surfactants, SASs) for small river sections with a different urban influence.<br />The influence of the interaction of CaCO3 and SAS with different chain<br />lengths and cationic and anionic hydrophilic centers has been analyzed.<br />UV VIS spectra of mixtures of laurylsulfate with cetyltrimethylammonium in<br />a ratio of 2:1 and 1:1 and separately the cationic SAS, treated by fine<br />particles of CaCO3, show significant decreasing in the amount of<br />cetyltrimethylammonium in analyzed solutions and its transfer on the<br />surface of carbonate calcium nanoparticles. Fixing laurylsulfate on the<br />surface of CaCO3 particles causes a decrease of the amount of cationic<br />SAS in analyzed solution. As a result of the cationic and anions SASs<br />interaction, a combination (or so-called complex) with a chemical<br />composition [anionic SAS * cationic SAS], electrostatically bonded, is<br />formed. UV-VIS spectra reveal the decomposition of this complex in<br />solution in the case of calcium carbonate adding. On the surface of CaCO3<br />particles, cetyltrimethylammonium can be bonded by laurylsulfate through<br />hydrophobic chains. Calcium carbonate adding changes the nature of<br />interaction of laurylsulfate with cetyltrimethylammonium along with the<br />spatial orientation of molecules on the SAS solid phase surface. This<br />phenomenon leads to increased degree of toxicity of cationic SAS in<br />aquatic environment. The obtained results have been confirmed both by<br />current published papers, as well as laboratory simulations in waters taken<br />from small rivers (Isnovat, Raut and Bac).</p></cfAbstr>
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