**Abbreviations**

The following abbreviations are used in this manuscript:

NTA: Nitrilotriacetic acid (2,2,2-Nitrilotriacetic acid)

EGTA: Ethylene glycol-bis(2-aminoethylether)- *N*,*N*,*N* ,*N*-tetraacetic acid EDTA: Ethylenediaminetetraacetic acid (2,2,2",2-(Ethane-1,2-diyldinitrilo)tetraacetic acid)
