Vpliv časa fiksacije zaščitnih pripravkov na osnovi bakra in etanolamina na izpiranje

diplomsko delo (visokošolski strokovni študij)

Branko Golež (Author), Marko Petrič (Reviewer), Miha Humar (Mentor)

Abstract

Bakrove spojine so učinkoviti in zelo razširjeni fungicidi. Njihova poglavitna slabost je neustrezna vezava v les. Ta lastnost omejuje uporabo zaščitenega lesa na mestih, kjer prihaja do izpiranja aktivnih komponent. Fiksacijo bakrovih učinkovin lahko močno izboljšamo z dodajanjem aminov in karboksilnih kislin. Ugotavljali smo kako čas vezave vpliva na fiksacijo baker-etanolaminskih pripravkov v les. Smrekove vzorce smo, v skladu s postopkom polnih celic, impregnirali s 3 različnimi kombinacijami in koncentracijami zaščitnih pripravkov na osnovi bakra, etanolamina, oktanojske kisline, kvartarnih amonijevih spojin in bora ter jim gravimetrično določili mokri navzem. Po določenem času (0, 3, 7, 14, 28 dni) kondicioniranja smo jih, v skladu s standardno metodo SIST ENV 1250/2, izpirali. Delež izpranega bakra v izpirkih smo določili z atomsko absorpcijsko spektroskopijo (AAS). Ugotovili smo, da se delež izpranega bakra prvih 14 dni zmanjšuje, nato pa zopet narašča. Prvi teden poteka vezava Cu preko etanolamina v les. Po 2 tednih pa pride bolj do izraza depolimerizacija lesnih polimerov: to povzroči etanolamin, ki na ta način vpliva na izpiranje bakrovih učinkovin iz lesa.

Keywords

zaščita lesa;bakrovi pripravki;izpiranje;vezava;

Data

Language:	Slovenian
Year of publishing:	2006
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[B. Golež]
UDC:	630*841.1
COBISS:	1446281
Views:	1251
Downloads:	242
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of time of fixation of copper-ethanolamine based wood preservatives on leaching
Secondary abstract:	Copper compounds are very effective and frequently used fungicides. Their most important disadvantage is their low fixation in wood, which decreases possibilities of use of copper impregnated timber, particularly in places where leaching of active ingredients occurs. Fixation of copper can be significantly improved with addition of amines and carboxylic acids. To find out how time influences the fixation of copper into spruce-wood samples were impregnated with 3 different preservatives in 3 different concentrations: based on copper, ethanolamine, octanoic acid, quaternary ammonium compound and boron; according to the full cell procedure. Then their retention was gravimetrically determined. After pre-determined periods of conditioning (0, 3, 7, 14, and 28 days), samples were leached according to the standard method SIST ENV 1250/2. The percentage of the leached copper in the leachates was determined with the atomic absorption spectroscopy. The results show that the percentage of the leached copper decreases in the first 14 days of fixation, later the percentage begins to increase again. In the first week copper binds via ethanolamine into wood. But after 2 weeks, depolymerisation of wood polymers caused by ethanolamine becomes more prominent and thus influences leaching.
Secondary keywords:	wood preservation;copper based preservatives;leaching;fixation;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univerza v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	VIII, 35 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:	21033