Yiziphi Izindlela Ezihlukile Ze-Penta Wood Preservative?

Ingabe ushintsha i-Penta iye ku-DCOI?

I-Penta (i-Pentachlorophenol) yokulondoloza izinkuni iyingxube ye-Pentachlorophenol namafutha (imvamisa i-AWPA P9a uwoyela). Kuyisilondolozi sokhuni esifakazelwe futhi esisunguliwe esesisetshenziswe iminyaka engaphezu kwengama-30 cishe kuma-80% wezigxobo e-USA.

Njengoba kungenzeka ukuthi uyazi, i-EPA (i-ejensi yokuvikela imvelo) isanda kuvimbela ukusetshenziswa kwe-Penta ngenxa yokukhathazeka kwemvelo nempilo. Ngenxa yalokhu, izinsiza eziningi eNyakatho Melika manje sezibheka ezinye izindlela zokulondoloza izinkuni ukuze zivikele izigxobo zazo zokhuni ekuboleni nasekuhlaselweni komhlwa. 

Kulesi sihloko esifushane, sigijima ngokusebenzisa ezinye izindlela ze-Pentachlorophenol nokuthi ungazisebenzisa kanjani ngokuhambisana nesistimu yokuvimbela egcwele ukuvimbela ukubola, ukufeza okufanayo, uma kungenjalo ukuvikela okungcono kunokusebenzisa i-Pentachlorophenol nje.

Ezinye izindlela zePentachlorophenol

Ezinye izinto zokulondolozwa kwezinkuni zihlukaniswa izigaba ezimbili: ezisekelwe emanzini nezisekelwe ku-oyela. 

Izilondolozi zezinkuni ezisekelwe emanzini njenge-CCA (Chromated copper arsenate) ACQ. (ama-alkaline copper quaternary compounds) I-CuAz (i-azole yethusi) kanye ne-ACZA (i-ammoniacal copper zinc arsenate) itholakala kabanzi. Lezi zivimbelakuvunda zokhuni zingenza isigxobo sibe yinselele kakhulu ukukhuphuka ngamabhuzu anama-spiked njengoba evame ukwenza ukhuni lube nzima. Zingaphinda zandise amathuba okuthi izigxobo zezinsiza ziphuke esimweni sezulu esibi/ekubanda futhi zikhuthaze ukwehluleka kwezigxobo lapho zivezwe emlilweni wasendle/ehlathini.

Izilondolozi zezinkuni ezisekelwe kuwoyela/ezixosha amanzi njenge-Penta, i-creosote, i-copper naphthenate kanye ne-DCOI esanda kuthuthukiswa (4,5-Dichloro-2-n-Octyl4-Isothiazolin-3-One) ayinakho ukonakala kwezinto ezilondoloza izinkuni ezisekelwe emanzini. 

Njengoba i-Penta ivinjelwe ngokuphumelelayo futhi i-creosote inomthelela ofanayo wemvelo nempilo njenge-Penta, i-DCOI ivela njengesilondolozi esithandwayo sokhuni esizothatha indawo ye-Penta emakethe yaseNyakatho Melika.

I-DCOI iyisilondolozi sokhuni esiphephile uma kuqhathaniswa, futhi ukuhlolwa kwenkundla kubonisa ukuthi singasetshenziswa cishe engxenyeni yezinga lokugcinwa kwe-Penta kuyilapho kunikeza isikhathi eside sokuphila kwesigxobo kune-Penta. Nakuba ngokomlando yayingasetshenzisiwe kabanzi, i-DCOI manje isikhuthazwa abakhiqizi abaningi bezigxobo njengokungena esikhundleni se-Penta wood preservative.

Injani i-DCOI uma iqhathaniswa nePenta?

Amagrafu amabili alandelayo avela ku-a umbiko oshicilelwe yi-Mississippi State University qhathanisa ukusebenza kokumelana nokubola kwe-Penta ne-DCOI ezindaweni ezimbili zokuhlola, i-Dorman ne-Saucier.

Amagrafu abonisa ukuthi i-DCOI iyasebenza ekwehliseni izinga lokubola kwezinkuni. 

Iziteki zokuhlola ezilashwe i-DCOI zinesilinganiso sokubola esingu-7.3 kwezingu-10 ngemva kweminyaka engu-28.5 yokuchayeka endaweni yase-Dorman kanye nesilinganiso sokubola kokungu-3 kwezingu-10 ngemva kweminyaka engu-25 yokuchayeka endaweni yokuhlola ye-Saucier enolaka kakhulu. 

Umfanekiso we-1. Ukuqhathanisa i-AWPA (1992) E7 ukusebenza kokubola kweziteki zasensimini eziphathwe nge-DCOI ne-penta ngemva kokuchayeka endaweni yokuhlola ye-Saucier.

Umfanekiso we-2. Ukuqhathanisa i-AWPA (1992) E7 ukusebenza kokubola kweziteki zasensimini eziphathwe nge-DCOI ne-penta ngemva kokuchayeka endaweni yokuhlola yase-Dorman.

Nakuba idatha yokuhlola ibonisa ukuthi i-DCOI iyindlela esebenzayo kune-Penta, iphinde ibonise ukuthi, njengazo zonke izilondolozi zezinkuni, i-DCOI ilahlekelwa ukusebenza kahle ngokuhamba kwesikhathi. Ngokubola kwezinkuni kuqala ngemva kweminyaka emi-4.

Idatha yokuhlolwa kwenkundla evela eyunivesithi yesifunda saseMississippi iqhathanisa ukusebenza kahle kwePenta ne-DCOI ekuvimbeleni ukubola kwezinkuni (Ukuqhathanisa ukusebenza kwenkambu ye-Pentachlorophenol ephethwe uwoyela ngokuqhathaniswa ne-isothiazolone DCOI efakwe esikhundleni njengezilondolozi zezinkuni, u-Darrel D. Nicholas, uMnyango Wemikhiqizo Yezinto Ezisimeme, i-Mississippi State University, i-Starkville, i-MS, e-USA) ebonisa ukusebenza kahle kwe-DCOI uma kuqhathaniswa ne-Penta.

Kukanjani Polesaver efanele?

Noma ngabe yiluphi uhlobo lwesilondolozi olukhethile, Polesaver iyisengezo esifanelekile kunoma yisiphi isigxobo njengoba sikhulisa ukuphila kwezigxobo ngeminyaka engama-20 kusukela ekuqaleni kungakhathaliseki ukuthi kuyini okokugcina ukhuni okushiwo. Uzobona kugrafu engezansi ukuthi umkhono womugqa waphansi onesithiyo esigcwele njengokuthi Polesaver +20 Ukuvikelwa kuvimbela ukuqala kokubola kwezinkuni okungenani iminyaka engu-20, okwandisa kakhulu ukuphila kwezigxobo.