Aerosol desolvation studies with a thermospray nebulizer coupled to inductively coupled plasma atomic emission spectrometry

Two desolvation systems commonly used in ICP-AES have been evaluated when coupled to a thermospray nebulizer. The desolvation systems are: (i) a thermostated spray chamber (TSC) and, (ii) a two-unit desolvation system (TUDS) in which the first unit is a heated single-pass spray chamber and the second one is a Liebig condenser. Both systems were evaluated with aqueous and organic solutions. The temperature of the chamber in the TSC (–5 to 20 °C) and the temperatures of the heated spray chamber (60 to 140 °C) and the condenser (–5 to 20 °C) in the TUDS were taken as variables. To evaluate the effect of these variables on the performance of the desolvation systems, drop size distribution of the tertiary aerosol, solvent and analyte transport rates and emission signal have been measured. Under optimal desolvation conditions, the values of the solvent transport efficiencies were similar for both systems, ranging from 2.3 to 9.5%. Analyte transport efficiency values ranged from 36 to 77% and from 5 to 8% for TUDS and TSC, respectively. TUDS gives rise to higher signals (6 to 7 fold higher) and lower LOD (2 to 11 times lower) than TSC. As regards the solvent nature, the highest emission intensity and lower LOD are obtained with ethanol, followed by water and butan-1-ol. The LOD values obtained with the combination thermospray–TUDS are 2 to 26 times lower than those obtained with a conventional pneumatic nebulizer coupled to the same desolvation system.

[1]  A. Canals,et al.  A microwave-powered thermospray nebulizer for liquid sample introduction in inductively coupled plasma atomic emission spectrometry. , 1997, Analytical chemistry.

[2]  A. Canals,et al.  Behaviour of a desolvation system based on microwave radiation heating for use in inductively coupled plasma atomic emission spectrometry , 1997 .

[3]  A. Canals,et al.  Behaviour of the thermospray nebulizer as a system for the introduction of organic solutions in flame atomic absorption spectrometry , 1996 .

[4]  J. Koropchak,et al.  Use of a multi-tube Nafion® membrane dryer for desolvation with thermospray sample introduction to inductively coupled plasma-atomic emission spectrometry , 1996 .

[5]  Jia Wan,et al.  Effect of power and carrier gas flow rate on the tolerance to water loading in inductively coupled plasma atomic emission spectrometry , 1996 .

[6]  J. Olesik,et al.  Inductively Coupled Plasma Optical Emission Spectrometry Using Nebulizers with Widely Different Sample Consumption Rates , 1994 .

[7]  A. Canals,et al.  Effect of analyte and solvent transport on signal intensities in inductively coupled plasma atomic emission spectrometry , 1992 .

[8]  A. Montaser,et al.  Argon inductively coupled plasma mass spectrometry with thermospray, ultrasonic, and pneumatic nebulization , 1991 .

[9]  M. Veber,et al.  Thermospray sample introduction to atomic spectrometry , 1987 .

[10]  A. Canals,et al.  Comparative Study of Several Nebulizers in Inductively CoupledPlasma Atomic Emission Spectrometry: Low-pressureversusHigh-pressure Nebulization , 1997 .

[11]  M. V. Holderbeke,et al.  Evaluation of a commercially available microconcentric nebulizer for inductively coupled plasma mass spectrometry , 1996 .

[12]  A. Canals,et al.  Behaviour of a single-bore high-pressure pneumatic nebulizer operating with alcohols in inductively coupled plasma atomic emission spectrometry , 1996 .

[13]  N. Jakubowski,et al.  Thermospray device of improved design for application in ICP-MS , 1995 .

[14]  F. Maessen,et al.  The performance of a low consumption thermospray nebulizer for specific use in micro-HPLC and general use in FT with ICP-AES detection , 1991 .

[15]  R. Browner,et al.  Influence of water on conditions in the inductively coupled argon plasma , 1988 .