Spectrofluorometric determination and chemical speciation of trace concentrations of chromium (III & VI) species in water using the ion pairing reagent tetraphenyl-phosphonium bromide

Chromatographic Separation, Total Determination and Chemical Speciation of Mercury in Environmental Water Samples Using 4-(2-Thiazolylazo) Resorcinol-Based Polyurethane Foam Sorbent-Packed Column

“…With reference to the data reported previously [25], a dual sorption (involving absorption related to "solvent extraction" and an added component for "surface adsorption") is the most probable retention mechanism for mercury(II) ion uptake by the TAR-loaded foams. Such a proposed model can be written as follows: C r = C abs + C ads = DC aq + SKLC aq ________ 1 + KLC aq (20) where C r and C aq are the equilibrium concentrations of mercury(II) ions onto the solid sorbent and in the aqueous media, respectively. The parameters C abs and C ads are the equilibrium concentrations of mercury(II) ions onto the tested solid sorbents as absorbed and adsorbed species, respectively.…”

“…Polyurethane foams (PUFs) and foams immobilized with supporting solvent extractants, chelating agents, liquid ion exchangers, anchored extracting groups and powdered ion exchangers sorbents have been reported for pre-concentration and separation of various inorganic and organic species from different media [16][17][18][19][20][21][22]. The most distinctive features of PUFs as solid sorbents are their membrane-like structure which differentiates them from others [20][21][22]. The foam membranes act as sorbents, i.e.…”

“…The volume-to-surface ratio of quasi-spherical membrane geometry in comparison with cylindrical or planar one are the most advantageous characteristics of PUFs. Moreover, the PUFs membranes offer a wider range of chemical modifications than normal bulky (granular) solids [17,20]. The potentialities of the PUF solid quasi-spherical membrane geometry sorbent have been reported [21,22].…”

Novel catalytic fluorescence method for speciative determination of chromium in environmental samples

“…have been used. Methods such as solidified floating organic drop microextraction (SFODME) in combination with graphite furnace atomic absorption spectrometry (GFAAS) (Moghadam et al 2011), cloud point extraction (CPE) using diethyldithiocarbamate (DDTC) as the chelating agent (Yildiz et al 2011), solid phase extraction procedure using ICP-MS (Guerrero et al 2012), fluorescence method using tetraphenylphosphonium bromide (TPP + ·Br − ) (El-Shahawi et al 2011), EPA methods 3060A and 3052 (Martone et al 2013), a disposable dual screen-printed electrode method using batch and flow analysis (Sánchez-Moreno et al 2010), p-aminoacetophenone and phloroglucinol (Parmar et al 2010), ultrasoundassisted cloud point extraction (UACPE) (Hashemi and Daryanavard 2012), electrospray ionization mass spectrometry using CYDTA (Hotta et al 2012), HPLC and preconcentration by CPE with 1-(2-thiazolylazo)-2-naphthol (TAN) as the chelating agent (Wang et al 2010), ytterbium (III) hydroxide (Duran et al 2009), mixed-micelle cloud point extraction using electrothermal atomic absorption spectrometry (ET-AAS) (Ezoddin et al 2010), room temperature ionic liquids (RTILs) for hollow fiber liquid phase microextraction (HF-LPME) combined with flame atomic absorption spectrometry (FAAS), etc., have been developed (Zeng et al 2012).…”

Highly sensitive procedure for the determination of ultra-trace amounts of bromate ions in water by dispersive liquid-liquid microextraction combined with UV-Vis spectrophotometry

“…One of these complexes, formed between tetraphenyl phosphonium bromide (TPP + Br − ) and halochromate (CrO3Cl − ), has been employed for developing a simple, convenient, and low cost spectrofluorimetric and spectrophotometric methods for the determination and speciation of chromium (III, VI) in water samples [19,20]. One of these complexes, formed between tetraphenyl phosphonium bromide (TPP + Br − ) and halochromate (CrO3Cl − ), has been employed for developing a simple, convenient, and low cost spectrofluorimetric and spectrophotometric methods for the determination and speciation of chromium (III, VI) in water samples [19,20].…”