Determination of trace metals in urine with an on-line ultrasound-assisted digestion system combined with a flow-injection preconcentration manifold coupled to flame atomic absorption spectrometry

Multi-element coprecipitation for separation and enrichment of heavy metal ions for their flame atomic absorption spectrometric determinations

“…The interferic effects of matrix components of real samples especially highly saline samples including seawater, urine are important problem in the determination of heavy metals [36][37][38][39][40][41][42]. The effect of some foreign ions ( Table 2) which interfere with the determination of metal ions by the proposed method or/and often accompany heavy metal ions in various real samples was examined.…”

Speciation of Dissolved Trace Nickel in Environmental Waters by On-Line Sonodigestion-Flow Injection Solid Phase Extraction Coupled to Flame Atomic Absorption Spectrometry

“…Ultrasound can degrade metal organic complexes by means of oxidative reactions, which are increased by the presence of nitric acid because the hydrogen peroxide formed as a result of water sonolysis was found to be about twice that observed in pure water under identical sonochemical conditions [22,23]. As a result, this methodology is used for the treatment of wastewater containing organic compounds to decompose them into highly degradable products [24], for degradation of organomercurials to determine inorganic and total mercury [25] and in a continuous mode to digest urine samples [26] and for sonolysis of seawater samples [27].…”

Coprecipitation of Ni2+, Cd2+ and Pb2+ for preconcentration in environmental samples prior to flame atomic absorption spectrometric determinations

“…The preconcentration factor found for this work is superior to some coprecipitation methods and other preconcentration techniques [29][30][31][32][33][34][35]. The detection limits of analytes are superior to those of preconcentration techniques [29][30][31][32][33][35][36][37][38][39][40]. The method is relatively rapid as compared with previously reported procedures for the enrichment of analyte ions ( Table 5).…”