Search results for "Complexone"
showing 4 items of 4 documents
Palladium(II) Complexes of Aminopolycarboxylic Ligands in Aqueous Solution
2011
Thebindingcapacityof fiveaminopolycarboxylicligands(APCs)(nitrilotriacetate(NTA),ethylenediamine-N,N,N 0 , N 0 -tetraacetate (EDTA), (S,S)-ethylenediamine-N,N 0 -disuccinic acid (S,S-EDDS), diethylenetriamine-N,N,N 0 ,N 00 ,N 00 -pentaacetate (DTPA), and triethylenetetraamine-N,N,N 0 ,N 00 ,N 000 ,N 000 -hexaacetate (TTHA)) toward the palladium(II) ion was studied by potentiometric titrations (ISE-H + electrode) in NaNO3 and in NaClO4/NaI (at different molar ratios) solutions and by spectrophotometric titrations (only in NaClO4), at I = 0.1 mol 3 kg � 1 and at T = 298.15 K. The high stability of Pd 2+ -complexones species inhibits the formation of sparingly soluble hydroxo species until pH …
Sequestration of alkyltin(IV) cations by complexation with amino-polycarboxylic chelating agents
2013
Abstract The binding capacity of four amino-polycarboxylic ligands (APCs) [nitrilotriacetate (NTA), ethylenediamine- N , N , N′ , N′ -tetraacetate (EDTA), (S,S)-ethylenediamine- N , N ′-disuccinic acid (S,S-EDDS) and diethylenetriamine- N , N , N′ , N″ , N″ -pentaacetate (DTPA)] towards mono-, di- and tri-alkyltin(IV) cations [(CH 3 )Sn 3 + , (CH 3 ) 2 Sn 2 + , (C 2 H 5 ) 2 Sn 2 + , (CH 3 ) 3 Sn + or (C 2 H 5 ) 3 Sn + ] was studied, in aqueous solutions, by ISE-H + potentiometry, at I = 0.1 mol L − 1 (NaCl) and at T = 298.15 K. In all the systems R x Sn (4 − x)+ − APC (R = CH 3 or C 2 H 5 ) a strong 1:1 species is formed together with protonated, hydroxo and dinuclear complexes. The valu…
Use of amino–polycarboxylic chelating agents for the sequestration of (CH3)Hg+ ion in aqueous solution
2012
Among the mercury organic derivatives, mono-methylmercury (MMHg) is by far the most toxic form of mercury because of its high capacity to enter biological membranes and accumulate in living organisms [1], as shown by the biomagnification factors: ~104 from water to edible shell-fish (mussels), and 106 –108 from water to big fishes (e.g. tuna fish) at the top of food chain [2]. The presence of complexing agents in the environment, which form soluble complex species with MMHg, favours the mobility of the ion in the aquatic ecosystems. Among anthropogenic complexing molecules, the most used ones are the aminopolycarboxylic chelating agents (usually called with the acronym APC) which are employ…
Sequestration of (CH3)Hg+ by amino‐polycarboxylic chelating agents
2012
Abstract The speciation of mono-methylmercury(II) cation (MeHg+) in the presence of Nitrilotriacetate (NTA), Ethylenediamine-N,N,N′,N′-tetraacetate (EDTA), diethylenetriamine-N,N,N′,N″,N″-pentaacetate (DTPA) and (S,S)- Ethylenediamine-N,N′-disuccinic acid (S,S-EDDS) was investigated at I = 0.1 mol L− 1 (NaCl) with the aim to assess a trend of sequestering capacity of the amino‐polycarboxylic (APCs) ligand class towards this cation in aqueous solution. The results obtained gave evidence for the formation of a mononuclear [MeHg(APC)] complex species, differently protonated MeHg(HiL) species (i = 1 to 3, depending on the APC considered), a mixed hydroxo species [MeHg(APC)(OH)] and a binuclear …