Direct and simultaneous determination of copper, manganese and molybdenum in seawater with a multi-element electrothermal atomic absorption spectrometer

Abstract

A simple method is described for the determination of trace metals (Cu, Mn and Mo) in seawater directly and simultaneously using a multi-element electrothermal atomic absorption spectrometer equipped with a transversely heated graphite atomizer. A mixture of Pd(NO 3 ) 2 and Mg(NO 3 ) 2 with the special gas (5% H 2 and 95% Ar) was used as the chemical modifier. Matrix interferences were removed completely, so a simple calibration curve method could be used. The relative standard deviations (RSD) for the simultaneous determination of Cu, Mn and Mo in CASS-3 (near shore seawater) were 2-12% and the detection limits were 0.42 mg l 21 for Cu, 0.68 mg l 21 for Mn and 1.2 mg l 21 for Mo. The accuracy of the method was confirmed by the analysis of certified reference saline waters (CASS-3, SLEW-2 and NASS-5). The analytical results were compared with those obtained using pure Ar as the purge gas. Scanning electron micrographs were used to investigate the physical form of Pd on the surface of the platform in the graphite furnace.

Developments in the Determination of Trace Elements by Atomic Spectroscopic Techniques

“…So this layer could promote a better dissociation of the CoO, improving sensitivity. Chen et al (2001) reported that when a mixture of Pd and Mg with a special gas (5% H 2 in Ar) was used as the chemical modifier, Cu, Mn, and Mo in seawater samples could be determined simultaneously using calibration curves with simple aqueous standards. Using Pd with the special gas (5% H 2 in Ar) as the chemical modifier also can determine Cu, Cr, Al, and Mg in urine directly and simultaneously using a multielement GFAAS (Chiu et al 2003).…”

Quantitation of Toxic Elements in Various Water Samples by Multi-element Graphite Furnace Atomic Absorption Spectrometry

“…It is to be noted that due to the excellent sensitivity and the multielement capability of some commercially available GFAAS systems (27)(28)(29)(30), several papers report simultaneous GFAAS methods for the quantitation of trace elements in complex matrices, for instance, foodstuff (31), wine (32)(33)(34), honey (35), mineral water (36), seawater (37)(38)(39)(40), aerosol (41), human brain (42), blood (43,44), and urine (45)(46)(47)(48), Al-alloy (49), and optical crystal (50) samples.…”

A novel on-line preconcentration method for trace molybdenum determination by USN–ICP OES with biosorption on immobilized yeasts

“…However, the cost of the instrumentation is not affordable to many laboratories. Trace molybdenum determination in water samples has been carried out by atomic absorption with electrothermal atomization (ETAAS) [9], atomic emission spectrometry with inductively coupled plasma (ICP OES) [10]. The concentration of molybdenum is too low to be directly determined with the se technique in well water, tap water [11], seawater samples [12], etc.…”