科研之友
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摘要
A microanalytical method based on small-sized electrothermal vaporization low power (15 W) and low Ar consumption (150 mL min(-1)) capacitively coupled Ar plasma microtorch and detection by optical emission spectrometry using a low-resolution microspectrometer was characterized for determination of As, Ag, Cd, Cu, Hg, Pb, Sb, Sn and Zn. Elements requiring usually either hydride (As, Sb, Sn) or cold vapor generation (Hg) were determined along with other elements using the completely miniaturized analytical system. A volume of 10 lL sample was vaporized on a Rh coil (1500 degrees C, 10 s), introduced into the plasma with the Ar flow followed by recording of 20 spectra episodes using the QE65 Pro microspectrometer. The emission spectrum of elements is simple, so that the coupling microtorch-microspectrometer with 0.4 nm fullwidth half maximum was adequate. The detection limits were in the range 1.5-40 ng mL(-1), similar or better compared to those found in the reference method, inductively coupled plasma optical emission spectrometry. The new method complies with the requirements for environmental analyses and has been applied to determine elements in soil and sediment samples using the standard addition method with recovery and precision in the range 92-104% and 0.4-11.6%, respectively. The miniaturized instrumentation including the plasma microtorch is a promising alternative to inductively coupled plasma optical emission spectrometry with pneumatical nebulization.
- 出版日期2017-1
