Despite the great progressmade in the
development ofmodernmicroextraction techniques, only a few related
studies focused on phosphate determination were found in the literature,
namely cloud point extraction of phosphomolybdenum blue
using the nonionic surfactant Triton X-114 [22], extraction of the ion
pair formed between 12-molybdophosphate and malachite green into
a methyl isobutyl ketone followed by microvolume spectrophotometry
[23], directly suspended droplet microextraction combined with
energy-dispersive X-ray fluorescence spectrometry [24], and dispersive
micro-solid phase extraction of ortho-phosphate ions onto magnetite
nanoparticles followed by determination as its molybdenum blue
complex