The content of some essential micronutrients and heavy metals in potting substrates

Rastni substrat predstavlja medij, v katerem se vzgajajo različne rastline. Namen raziskave je bil določiti vsebnosti nekaterih esencialnih mikrohranil in neesencialnih kovin v rastnih substratih. Za kislinski razklop vzorcev v mikrovalovni pečici smo uporabili mešanico HNO3, HCl in HF. Koncentracije Fe, Zn in Mn smo izmerili s plamensko atomsko absorpcijsko spektrometrijo (FAAS) in koncentracije Cu, Cr, Cd ter Pb z elektrotermično atomsko absorpcijsko spektrometrijo (ETAAS). Vsebnosti Fe, Zn, Mn, Cu, Cr, Cd in Pb so bile 0,10-2,51 % na suho snov (SS), 14,1- 213 mg/kg SS, 11,5-715 mg/kg SS, 3,99-61,4 mg/kg SS, 2,87-341 mg/kg SS, 0,100-1,142 mg/kg SS in 4,73-46,2 mg/kg SS. Vse substrate, razen substrata za zasaditev balkonskega cvetja lahko glede na izmerjene vrednosti Cd, Cr, Cu, Pb in Zn uvrstimo v prvi kakovostni razred.Potting substrate is a medium used for growing different plants. The aim of the presented research was to determine the content of certain essential micronutrients and non-essential metals in the potting substrates. Microwave assisted acid digestion of samples was performed using a mixture of HNO3, HCl and HF. The concentrations of Fe, Zn and Mn were measured via flame atomic absorption spectrometry (FAAS) and the concentrations of Cu, Cr, Cd and Pb were determined via graphite furnace an atomic absorption spectrometry (ETAAS). The contents of Fe, Zn, Mn, Cu, Cr, Cd and Pb ranged between 0,10-2,51 % on a dry weight basis (DW), 14,1-213 mg/kg DW, 11,5-715 mg/kg DW, 3,99-61,4 mg/kg DW, 2,87-341 mg/kg DW, 0,100-1,142 mg/kg DW, and 4,73-46,2 mg/kg DW, respectively. All analysed potting substrates, except the substrate for planting balcony flowers, can be classified as first class, depending on the measured Cd, Cr, Cu, Pb and Zn values