Lead and zinc concentration in genetic horizons of Terra rossa soil at a local scale. How these concentrations differ?
Koncentracije olova i cinka u genetskim horizontima crvenice na lokalnoj razini. Kako se te koncentracije razlikuju?

Boško Miloš, Aleksandra Bensa
2020 Journal of Central European Agriculture  
Koncentracije olova i cinka u genetskim horizontima crvenice na lokalnoj razini. Kako se te koncentracije razlikuju? ABSTRACT The goals of this study were to (i) determine the concentration of the Pb and Zn in Terra rossa soil, (ii) reveal its origin and (iii) establish how the concentration of these elements between genetic horizons differ. In a total of 128 soil samples collected from the genetic A and B horizon of 64 Terra Rossa soil profiles were analyzed for aqua regia soluble
more » ... oluble concentration of lead (Pb A and Pb B ) and zinc (Zn A and Zn B ) as well as soil properties: pH in KCl, CaCO 3 , soil organic carbon (SOC) and particle size distribution. The median value of Pb A , Pb B , Zn A , and Zn B were 41.6, 33.8, 106.1 and 103.8 mg/ kg, respectively. The principal component analyses have shown that the Pb and Zn contribute most to the variability of A horizon and have the same and natural origin -they are accumulated by geochemical weathering and soil-forming processes. Using non-parametric techniques (the two-sided Kolmogorov-Smirnov test (K-S) and a shift function (SF) we estimated that (i) the Pb A and Pb B distribution differ in spread and median and (ii) the Pb B distribution need to be progressively shifted, at the whole range starting from 2.8 mg/kg for the first decile; 7.2 mg/kg for the fifth decile (median) to 12.2 mg/kg for the ninth decile to match Pb A distribution. In the case of Zn, there is no evidence that the distribution of Zn A is in any way different than the distribution of Zn B . This implies that the Zn A and Zn B have a remarkably similar shape of their distribution functions and a noticeable slight shift with a value of 2.3 mg/kg at fifth decile. The analysis presented here illustrated why detailed statistical descriptions can help to better understand how and by how much lead and zinc distributions in Terra rossa genetic horizon differ. SAŽETAK Ciljevi ovog istraživanja bili su (i) odrediti koncentracije olova i cinka u crvenici, (ii) otkriti njihovo porijeklo i (iii) utvrditi kako se koncentracije tih elemenata razlikuju između genetskih horizonata. Analizirano je ukupno 128 uzoraka tla sakupljenih iz genetskog A i B horizonta u 64 profila crvenica, na koncentracije olova (Pb A i Pb B ) i cinka (Zn A and Zn B ) u zlatotopki, kao i na svojstva tla: pH u KCl-u, CaCO 3 , organski ugljik i mehanički sastav tla. Vrijednosti medijane za Pb A , Pb B , Zn A , i Zn B iznosile su: 41,6, 33,8, 106,1 i 103,8 mg/kg. Analiza glavnih komponenti pokazala je da varijabilnosti A horizonta najviše doprinose Pb i Zn koji imaju isto, prirodno porijeklo -akumulirani su geokemijskim trošenjem i pedogenetskim procesima. Korištenjem neparametrijskih tehnika (dvostranog Kolmogorov-Smirnov testa (K-S) i funkcije pomaka) ustanovljeno je (i) da se raspodjele Pb A i Pb B razlikuju u disperziji i medijani i (ii) da Pb B distribuciju treba postupno pomaknuti po cijelom rasponu počevši od 2,8 mg/kg na prvoj decili preko 7,2 mg/kg na petoj decili (medijani) do 12,2 mg/kg na devetoj decili da bi se podudarala s Pb A raspodjelom. U slučaju cinka, nema dokaza da se raspodjela Zn A na zamjetan blagi pomak od 2,3 mg/kg na petoj decili. Ovdje prikazana analiza ilustrira zašto detaljni statistički opisi mogu pomoći u boljem razumijevanju kako i koliko se razlikuju distribucije olova i cinka u genetskim horizontima crvenice. Ključne riječi: kumulativna funkcija raspodjele, porijeklo teških metala, potencijalno toksični elementi, funkcija pomaka
doi:10.5513/jcea01/21.3.2588 fatcat:n3pknex6fjak3iz6j2nn3o43zy