Characteristics of precipitates from Terme Tuhelj thermal water supply pipes

Termalna voda u Tuheljskim Toplicama s izvora do kompleksa bazena dolazi pomoću dovodnih cijevi unutar kojih se taloži precipitat. Precipitat ili talog netopljiva je čvrsta tvar koja je nastala reakcijom u otopini. Precipitat u Termama Tuhelj nastao je na stijenkama dviju različitih dovodnih cijevi, jedna željeznog, a druga plastičnog sastava. Za potrebe ovog rada i istraživanja precipitata korištene su metode: određivanja sadržaja karbonata volumetrijskim mjerenjem Schieblerovim kalcimetrom, kompleksometrija, infracrvena spektroskopija s Ferierovom tranformacijom (FTIR) i rendgenska difrakcija na prahu (XRPD). Cilj ovog istraživanja je uočiti razlike između precipitata istaloženog u dvije različite cijevi. Rezultati pomoću četiri različite analize potvrdili su da su precipitati izgrađeni od kalcijevog karbonata, da sadrže sličan udio magnezija i kalcija te da su po sastavu i strukturi jednaki. Thermal water in Tuheljske Toplice comes from the spring to the pool complex by means of supply pipes within which the precipitate settles. A precipitate is an insoluble solid formed by a reaction in solution. The precipitate in Terme Tuhelj was formed on the walls of two different supply pipes, one of iron and the other of plastic composition. For the purposes of this work and precipitate research, the following methods were used: determination of carbonate content by volumetric measurement with a Schiebler calcimeter, complexometry, infrared spectroscopy with Ferier transformation (FTIR) and X-ray powder diffraction (XRPD). The aim of this study is to observe the differences between the precipitate precipitated in two different supply pipes. The results using four different analyzes confirmed that the precipitates were composed of calcium carbonate, that they contained a similar proportion of magnesium and calcium, and that they were identical in composition and structure.