Copper speciation in size-fractionated aerosol samples using TXRF-XANES
نویسندگان
چکیده
The health effects of aerosol depend on the size distribution and the chemical composition of the particles. Heavy metals of anthropogenic origin are connected to the fine aerosol fraction (PM2.5). The composition and speciation of aerosols can be variable in time, due to the time-dependence of anthropogenic sources as well as meteorological conditions. Synchrotron-radiation total-reflection X-ray fluorescence (SR-TXRF) provides very high sensitivity for aerosol characterization [1]. Xray absorption near-edge structure (XANES) spectrometry in conjunction with TXRF detection can deliver speciation information on heavy metals in aerosol particles collected directly on the reflector surface. The suitability of TXRF-XANES for zinc speciation in size-fractionated aerosols from a short sampling period was previously tested. Information on Zn speciation could be obtained from air concentration of Zn as low as 100 pg/m for a 20-min sampling time in the 0.5-1 μm aerosol fraction [2]. The measurements were extended to speciation of copper, another environmentally important element.
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