Magnetic dispersive micro-solid-phase extraction for the preconcentration and extraction of lead (II) and cadmium ions from environmental samples using magnetic CoFe2O4 @ SiO2@4-aminobenzoic acid-functionalized graphene oxide as a green and efficient sorbent

A magnetic dispersive micro-solid-phase extraction as a simple and efficient sample preparation procedure was developed to extract lead (II) and cadmium (II) ions. The microextraction method was enhanced using an ultrasonic bath as a suitable device and a surfactant as a dispersion agent to disperse a sorbent into a low volume of distilled water before injecting it into the sample solution. This procedure increases the sorbent dispersion...