Improved Slurry Sampling Electrothermal Vaporization System Using a Tungsten Coil for Inductively Coupled Plasma Atomic Emission Spectrometry

Abstract

An improved ETV system for the determination of trace vaporizers, a much lower current is sufficient to reach very high heating rates and temperatures of up to 3000 °C. elements in diverse samples by slurry sampling ETV-ICP-AES is presented. It consists of a tungsten coil vaporizer, a simple Therefore, inexpensive and small power supplies are adequate. Sample volumes of up to 40 ml can be pipetted on to the coil computer controlled power supply with high reproducibility of the output voltage and a fast and efficient data acquisition and and, by using the slurry sampling technique, the direct analysis of powdered solids is possible. processing system for the short transient signals. Coupling the ETV system with the spectrometer and control of additionalThe tungsten-coil vaporizer in combination with slurry sampling has already been applied to the determination of functions were performed by means of an interface connected to the ETV computer, allowing operation with a high degree of trace impurities in silicon carbide by ETV-ICP-AES18 and silicon dioxide by ETV-ICP-MS.19 Although the experimental automation. The ablation of tungsten in the vaporization step could be significantly reduced by coating the coil with tungsten set-up used for ETV-ICP-AES worked satisfactorily and provided accurate results,18 improvements concerning power carbide and by a decrease in the concentration of traces of oxygen in the Ar-H 2 carrier gas using a high-voltage supply, data acquisition and processing, spectrometer coupling, automation and tungsten ablation were necessary. In this discharge cell. The tungsten ablation was investigated for aqueous solutions and also for silicon carbide as an example of paper, the improved ETV system is described. In addition, the transport losses of several elements were determined by means a refractory matrix. The transport losses of the analyte elements Au,

Tungsten Coil Devices in Atomic Spectrometry: Absorption, Fluorescence, and Emission

“…For solid samples, slurry sampling can be used. 12,23,24 This is of great interest particularly for the analysis of materials that are difficult to decompose. As an ETV device, W-Coil is a good alternative to the graphite furnace.…”

Analysis of Silicon Dioxide and Silicon Nitride Powders by Electrothermal Vaporization Inductively Coupled Plasma Atomic Emission Spectrometry Using a Tungsten Coil and Slurry Sampling

“…the carrier gas, and TCC of the coil. 48 In the following, tungsten The significance of this interference depends on the amount ablation and the effect of a HVDC and TCC in the presence of tungsten ablated from the coil during vaporization. As has of silicon nitride and silicon dioxide are discussed in detail.…”

Determination of natural Sr and 90Sr in environmental samples by ETV-ICP-MS

“…However, few publications can be found relating to its use in conjunction with the ICP. [22][23][24][25][26][27][28][29][30] This device offers a high melting point, low power requirement, substantial chemical inertness, high heating rate, low cost and no need for a dedicated cooling system.…”