Research Article

Magnetic Solid-Phase Extraction Using Fe3O4@SiO2 Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples

Table 1

Effect of contaminants for detecting 40 μg/L PQ.

ContaminantsTolerance limits

K+, Na+, Zn2+1000
Chlorophyll, lutein600
Cd2+, Mg2+, 500
2,4-D, 2,4,5-T, DDT, Kelthane, lindane200
Cu2+, Ni2+, Ca2+, Fe2+, Mn2+100
Al3+40
Fe3+, Pb2+20
Aquacide5

DDT: dichlorodiphenyltrichloroethane.