a sandwich-type three-dimensional layered double hydroxide nanosheet array as a novel fiber coating for headspace solid-phase microextraction of phenols from water samples

In the present study, graphene oxide nickel-titanium layered double hydroxide (niti-ldh/go) was synthesized. niti-ldh/go was used as a fiber coating for the determination of phenolic compounds for headspace solid‐phase microextraction methods in water samples. these extracted components were introduced into a gas chromatography-mass spectrometry (gc-ms) injection port for further analysis. the following analytical merits were used under optimal conditions: temperature of extraction: 80 ºc, desorption duration: 2 min, extraction time: 40 min, temperature time:  270 oc, salt concentration: 10% (w/v), 0.01–100 µg l-1 and 0.004-0.09 ng ml-1 for dynamic linear rang (dlr) and limit of detection (lod), respectively. the repeatability under optimal conditions for one fiber (n = 3) is given as the relative standard deviation (r.s.d. %) which was between 6.5 % and 9.9% for these compounds. the results of the experiments clearly indicate that the niti- ldh /go nanostructure fiber is an appropriate choice for hs-spme of phenols analysis. by combining hs-spme using niti- ldh /go nanostructure fiber and gc-ms, low lods can be achieved which can be used for determining phenols from water samples.