b'ENVIOMETC and pHpH plays an important role in the formation of metal complexes and this is a crucialparameter for the chelates efficacy for application in agriculture. We have compiledbelow the pH range, calculated by chemical simulations, for which at least 80% of themetal cation is chelated.Table 2 pH range, calculated by chemical simulations, for which there is at least 80% of metal complexed by EDDS and IDHA,in a medium with Ca and Mg in excess.Cation Biodegradable chelating agentEDDS IDHAFe 27 24.2Cu 114 2.311.3 Mn 612 713Zn 3.812.8 3.810.8Calculated from: Isabel S S Pinto, et al., Environ Sci PollutRes (2014) 21:1189311906In general, ENVIOMETC chelating agents show better pH stability compared to the IDHA chelating agent.'