Effect of herbicide pH on archaeological stones
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The document discusses testing the effect of herbicide pH levels on archaeological stones. It outlines plans to measure the pH of soil samples from a historic villa site, compare it to herbicide pH, add herbicide to soil samples, and test pH over time. It also describes procedures to measure the pH of stone washings before and after applying herbicide, and to examine changes in a stone's mass and appearance before and after herbicide application. The goal is to understand how herbicide acidity impacts historic building materials.
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Effect of herbicide pH on archaeological stones
- 1. The effect of the pH of herbicides on archaeological stones The Zejtun Roman Villa
- 2. The Acidity of Soil and Herbicides • Test pH of soil sample taken from site • Test pH of herbicides • Compare pH with data • Add herbicide to soil • Test pH • Leave to stand until day of decay • Test pH
- 3. pH of stone • Wash stone with small volume of distilled water • Keep washings and test the pH • Add herbicide • Wash the stone again and test the pH
- 4. Stone and herbicide • Find mass of stone • Take the appearance of stone using USB microscope • Apply herbicide • Allow decay time • Check change in mass and change in appearance of stone
- 5. Set-up
- 6. Thank You
Editor's Notes
- Ahna group ta studenti tal-kimika gejjin mill-iskola Santa Margerita Sekondarja Zejtun. Bhalissa qeghdin nahdmu fuq progett li ser insemmuh ‘ The effect of the pH of herbicides on archaeological stones’ b’ referenza partikulari ghall- villa Rumana gewwa z-Zejtun. Dan il –progett ser ikun esibit fil- gimgha tax-xjenza li issir ghall- habta ta April go Villa Bighi, li hi ic-centru tax-xjenza u t-teknologija. Kif kulhadd jaf il- villa Rumana tinsab go l-iskola b’hekk rajna li tkun opprtunitata tajba biex nahdmu ma l-arkeologi biex insibu l-ahjar soluzzjoni ghal- haxix hazin li jikber f’dan is-sit. Dan hu ta sgombru kbir ghall- dawn l-arkeologi minhabba l-fatt li ta kull sena ikollhom jaqghilhu dawn il-pjanti b’idejhom minhabba li ma hawn l-ebda ricerka li taghti widen jekk l-herbicidi jaghmlux hsara fuq it-tip ta gebel li insibu f’din is-sit. B’hekk idecidejna li ninvestigaw l- effett li ghandhom il-herbicidi fuq il-gebla.
- L-ewwel ghan taghna hu li naraw il-persistenza tal –pH tal- herbicida fil- hamrija. Biex nilhqu dan l-ghan, ser inkunu qeghdin nittestjaw l-pH tal- hamrija u herbicida ghalihom. It –tipi ta herbicidi ser ikunu qeghdin jigu itestjati b’concentrazzjoni specifika u b’ammont kif hemm indikat fuq id-direzzjoni tal-uzu mahrug mill-manifattur tal- herbicida. Dan umbghad ser ikun segwit billi nitestjaw l-pH tal hamrija ezatt wara li inzidu l –herbicida kif ukoll wara l-perjodi tad-dikomponiment, hekk kif inhu indikat mill-manifattur. Huwa impossibli li nittestjaw kull herbicida li hawn fis suq, b’hekk idecidejna li nittestjaw zewg tipi ta herbicidi : Monsanto Round up glyphosate, li jintuza f’siti arkeologici maltin u Lunor Flo li ghandu bazi kimika differenti minn dak ta qabel, b’hekk jista jkun li jkollu effetti differenti. L- pH ser qed ikun irekordjat b’ data loggers li huma sensittivi hafna ghall-tibdil fil-pH.
- It- tieni ghan hu li insibu jekk l-pH tal gebla jigix affetwat wara li l-herbicida jigi uzat. B’ Hekk ser inkunu qeghdin nahslu l-gebla qabel u wara l-applikazjoni tal- herbicida b’ilma distillat. Dan umbghad jigi t-testjat ghall-pH. Fil- progett ser inkunu qeghdin nuzaw erbgha tipi ta gebel differenti. Il- Franka, Zonqor, Gibs u Gir, li kollha insibuhom fil- Villa Rumana taz-zejtun.
- Ir-rizultati li ser nigbru qabel ser ituna indikazzjoni ahjar ghall-ahhar ghan ta l-esperiment. Ser naraw it-tibdil fit-toqol u l-apparenza fil- gebel wara li il-herbicida ikun applikat. It-tibdil fl-apparenza ser ninutawha billi nuzaw Usb microscope li jtina stampa cara ta l-effet li ser ikun hemm.
- Dan hu L-apparat principali li ser nuzaw waqt l- esperiment. Ridna li kemm jista jkun noholqu l-istess sitwazzjoni li hemm fil – Villa, dik li il-hamrija tkun pogguta fuq l- gebel, biex b’hekk il- herbicida qatt ma jkun mitfuh direttament fuq il – gebla. Ser ikunu qeghdin nuzaw bicca minn flixkun tal-plastic bil qiegh imtaqqab. Dan ghaliex ahna hsiebna li jkun idea tajba li kieku nhallu l- herbicida jiffiltra , bhal ma issoltu jigri f’ hamrija normali. Il-’filtrate’ jigi itestjat kif spjegaw shabi aktar il- quddiem
- L-esperiment ghadu fil bidu tieghu minhabba li l-iskola bdiet il gimgha li ghaddiet. Pero, ahna qed inharsu il-quddiem biex nipprezentaw ir-rizultati taghna waqt il-gimgha tax-xjenza. Tifmhu li ghandna studenti fis-sekondarja b’hekk l-ammont ta kimika li nafu hu kemxejn limitat… pero nisperaw li dak li insibu minn dan l-esperiment ikun ta indikazzjoni ahjar ghar-ricerki futuri. Nixtieq nirringrazjaw b’ mod specjali lill- Dr. Vella, Prof. Cassar and Ms. De Angelis ghas- support kontinwu li qeghdin jaghtuna. Grazzi ta l-attenzjoni.