Is Mehlich 3 soil extraction a suitable screening method for determination of some risk elements?

Legislation limits for risk elements (As, Be, Cd, Co, Cr, Cu, Ni, Pb, V, Zn) in agricultural soil the Czech Republic are given content of extracted by aqua regia. This extraction is time consuming and environmentally unfriendly. The regular survey based on Mehlich 3 universal extractant covers simultaneous determination macronutrients, sulphur, micronutrients inductively coupled plasma optical emission spectrometry (ICP-OES). Our study focused possibility to use also preliminary screening simultaneously with other ICP-OES method. was confirmed as a reliable method Cd regarding sensitivity, specificity precision (> 0.8) when cut-off value 0.27 mg/kg extracts used prediction soils be above or below legislation limit, which turn regia extraction. Very good results were obtained Be promising received As, Cu V. But available data not sufficient values Pb Zn.