Vpliv lastnosti vode na izpiranje bakrovih pripravkov iz lesa

diplomsko delo (visokošolski strokovni študij)

Aljoša Uhelj (Author), Franc Pohleven (Reviewer), Miha Humar (Mentor)

Abstract

Bakrovi pripravki so že dolgo let v uporabi, vendar še vedno ni alternativnih zaščitnih sredstev, ki bi jih lahko povsem nadomestila. Zelo znana kombinacija aktivnih komponent je CCB (baker, krom, bor), pri kateri je sporen predvsem krom. Baker pa lahko učinkovito veže v les kombinacija etanolamina in oktanojske kisline, kar je bilo dokazano z izpiranji v laboratoriju. Na izpiranje bakra iz lesa imajo prav gotovo vpliv tudi različni tipi vode, ki prihajajo v neposreden stik z lesom. Zato smo v diplomski nalogi vzorce izpirali z različnimi tipi vode: morsko, rečno, vodovodno, destilirano ter simulirano barjansko vodo. Smrekove vzorce smo z metodo polnih celic vakuumsko impregnirali z različnimi bakrovimi pripravki, pri katerih smo si za referenčni pripravek vzeli znano kombinacijo CCB. Po fiksaciji smo pričeli z izpiranjem po prirejeni standardni metodi SIST ENV 1250/2. Delež izpranega bakra smo določili z atomsko absorpcijsko spektroskopijo. Ugotovili smo, da se baker glede na tip vode različno izpira. Pri vodah, ki so imele višji pH, smo opazili večje izpiranje. Simulirana barjanska voda je pri vseh kombinacijah zaščitnega sredstva povzročila največje izpiranje, najmanjše pa smo zabeležili pri destilirani tervodovodni vodi. Poleg nizke vrednosti pH, ki je vplivala na izpiranje bakrovih komponent iz lesa, je imela zagotovo vpliv tudi sama kombinacija pripravka. Opazili smo, da se je baker najbolje vezal v vzorce zaščitene s pripravki na osnovi kroma, najslabše pa v les zaščiten s pripravki na osnovi bakra, etanolamina kvartarne amonijeve spojine, oktanojske kisline in bora.

Keywords

zaščita lesa;bakrovi pripravki;izpiranje;

Data

Language:	Slovenian
Year of publishing:	2006
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[A. Uhelj]
UDC:	630*841
COBISS:	1402761
Views:	1250
Downloads:	279
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of water properties on leaching of copper preservatives from wood
Secondary abstract:	Copper compounds are effective wood preservatives, since there are no other equally protection found on the market. CCB (copper, chrome, boron) is one of the best-known protection agents. Yet chrome used as a binding agent is very much disputed. Currently equally effective substitutes are being sought. Recent research has shown that copper is efficiently binding in combination with ethanolamine acid or octanoic acid. Various types of water coming into direct contact with wood definitely influence the leaching of copper from wood. Hence various types of water were used in the tests, i.e. sea water, fluvial water, tap water, distilled and simulated marsh water. Spruce (Picea abies) wood samples were impregnated according to the full cell treatment, and with different types of protection agents. After binding, the samples were leached according to the modified standard procedure SIST ENV 1250/2. Atomic absorption spectroscopy was used to determine the amount of copper in leachates. The tests showed established that the amount of copper leached varies according to different types of water. Waters having a higher pH-value resulted in more prominent leaching. The simulated marsh water caused the highest copper leaching. Despite of low pH value of leaching solution, composition of preservative solution influence copper fixation as well. The best fixation was determined at wood treated with copper-chromium based solution and the lowest one at the ones treated with copper, ethanolamine, quaternary ammonium compound, octanoic and boron.
Secondary keywords:	wood preservation;copper based preservatives;leaching;
Type (COBISS):	Undergraduate thesis
Pages:	X, 32 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	20999