Remediation of soil from a former zinc smelter area with stabilization with cement | Remediacija zemljine z območja stare cinkarne v Celju z metodo stabilizacije s cementom

English. Five representitative samples of heavily polluted soil from a former industrial area in Celje (Slovenia) containing 7300 - 17200 mg kg-1 total Pb, 6000 - 63600 mg kg-1 total Zn and 24 - 250 mg kg-1 total Cd were remediated with the stabilization method with 15 % (w/w) portland cement. After 4 months of stabilization the mobility of Pb, Zn and Cd assessed with Toxicity Characteristic Leaching Procedure (TCLP) decreased by factors 5.8 - 17.4, 8.1 - 35.8 and 4.3 - 7.3, respectively. Potential availability of Pb, Zn and Cd for plants assessed with dietilentriaminpentaacetic acid (DTPA) extraction decreased by factors 1.6 - 9.8, 1.1 - 2.1 and 1.3 - 4.1 after stabilization, respectively. Bioacessibility of Pb assessed with a physiologically based extraction test (PBET) decreased after stabilization by factors up to 11.3 in the small intestine fraction.

Slovenian. Pet reprezentančnih vzorcev močno onesnažene zemljine z območja stare cinkarne v Celju (Slovenija), ki so vsebovali od 7300 do 17200 mg kg-1 celokupnega Pb, od 6000 do 63600 mg kg-1 celokupnega Zn in od 24 do 250 mg kg-1 celokupnega Cd, smo remedirali z metodo stabilizacije s 15 ut.% portland cementa. Po 4 mesecih stabilizacije se je mobilnost Pb, Zn in Cd določena s TCLP metodo ("Toxicity Characteristic Leaching Procedure") 5,8 - 17,4, 8,1 - 35,8 oz. 4,3 - 7,3-krat zmanjšala. Potencialna dostopnost Pb, Zn in Cd za rastline, določena z ekstrakcijo z dietilentriaminpentaocetno kislino (DTPA), se je po stabilizaciji 1,6 - 9,8, 1,1 - 2,1 oz. 1,3 - 4,1-krat zmanjšala. Biodostopni delež Pb določen s fiziološko osnovanim ekstrakcijskim testom ("Physiologically Based Extraction Test"; PBET) se je v črevesni frakciji po stabilizaciji 5,9 - 11,3-krat zmanjšal.