Synthesis of carboxymethyl kappa-Carrageenan coated nanomagnetite and its application as preconcentration medium for water samples containing Pb(II)-Cu(II) and Pb(II)-Co(II)

CMKC coated nanomagnetics were developed for the application of preconcentration of metal ions in water samples, through an adsorption-desorption mechanism. The preconcentration method is needed in the analysis of metal ion levels in water, if the metal ion concentration in the sample is very low. Water samples from environmental compartments generally consist of more than one contaminant metal ion, and the threshold is very low, therefore a multi-metal ion preconcentration method needs to be developed. The density of competitor metal ions can affect the absorption of metal ions by the surface of the CMKC relieved nanomagnetite which is used as a preconcentration medium. This study aims to synthesize nanomagnetite coated with carboxymethyl kappa-carrageenan, and study its use as a preconcentration medium in water samples containing a mixture of lead (Pb (II)) and copper (Cu (II)), or Cobalt (Co (II))) through the adsorption-desorption process. The stages of this research were (1) synthesis of CMKC coated nanomagnetites and characterization of the synthesized results using FTIR, XRD, SEM-EDX and VSM analysis data (2) study of the application of CMKC coated nanomagnetites as preconcentration media of water samples containing Pb (II) (II) and Cu (II) then Pb (II) (II) and Co (II) at the variation of the adsorption pH and the concentration ratio of each metal mixture in the sample. The ability of CMKC-coated nanomagnetite as a preconcentration medium was measured based on the ability of metal adsorption (Aads) and desorption as well as the percentage increase in metal concentration (% pre) in the sample after the preconcentration process. The results showed that the CMKC coated nanomagnetite could be used as a preconcentration medium for metal ions in water samples containing Pb (II) (II) -Cu (II) and Pb (II) (II) -Co (II). The optimal conditions for adsorption for Pb (II) and Cu (II) ions occur at pH 6, the optimal conditions for adsorption of Pb (II) and Co (II) ions occur at pH 6. The greater the concentration ratio of one type of metal in the sample to the ion For other metals, the greater the absorption by the CMKC-coated nanomagnetite, the absorption is indicated by the value of Cads. The percentage increase in concentration (% pre) Pb (II) in each mixture is always lower than% pre Cu (II) and Co (II) at each concentration ratio of the composition of the samples tested.