The main components of heavy metal chelating agents are usually one or more compounds that can form stable complexes with heavy metal ions. Common components of heavy metal chelating agents include organic acids, organic amines, and phosphine compounds.
Organic acids are one of the common components in heavy metal chelating agents. They usually contain acidic functional groups, such as carboxyl groups (- COOH). Organic acids can form stable complexes with heavy metal ions through acidic functional groups. Common organic acids include oxalic acid (such as disodium oxalate), oxalic acid (such as disodium oxalate) and citric acid (such as Trisodium citrate).
Organic amines are also common components in heavy metal chelating agents. They usually contain amino (- NH2) or amino (- NR2) functional groups. Organic amines can form stable complexes with heavy metal ions through amino or amino groups. Common organic amines include Ethylenediamine (such as Ethylenediaminetetraacetic acid), triethylenetetramine and polyamine (such as Polyethylenimine).
Phosphine compounds are also common components in heavy metal chelating agents. They usually contain phosphorus atoms (P). Phosphine compounds can form stable complexes with heavy metal ions through phosphorus atoms. Common phosphine compounds include Triphenylphosphine (such as Triphenylphosphine hydrochloride) and di Ethylenediamine tetra Methylphosphine (such as di Ethylenediamine tetra Methylphosphine hydrochloride).
In addition to the above components, heavy metal chelating agents can also include other auxiliary components, such as additives, stabilizers, and buffering agents, to improve chelating effect and stability.