Oral bioaccessibility tests to measure potentially toxic elements in inhalable particulate matter collected during routine air quality monitoring

摘要: The simplified bioaccessibility extraction test (SBET) and the stomach phase of unified method (UBM) have been modified for use in assessing potentially toxic elements samples PM10 collected during routine air quality monitoring. Arsenic, Cd, Cr, Cu, Fe, Mn, Ni, Pb Zn were measured by inductively coupled plasma mass spectrometry extracts synthetic PM prepared loading candidate soil reference material BGS102 onto TX40 (Teflon-coated borosilicate) filters widely used standard commercial tapered element oscillating microbalance/filter dynamics measurement system (FDMS) ambient particulate monitors. Analysis blanks revealed two important sources contamination that had to be controlled order achieve reproducible results. syringe SBET released Cu into sample filtration washed with 80 mL 0.4 M glycine at pH 1.5 immediately prior use, whilst FDMS collect found contain sufficient extractable (ca. 3 μg per filter) almost double concentration soil. latter is a consequence filter manufacture so could not eliminated, but was successfully overcome means blank-subtraction. A ten-fold miniaturisation six-fold UBM allowed 0.1 g processed, analyte recoveries generally within ±10% those obtained when conventional procedures used. Comparison between results applied alone, loaded filters, indicated presence no effect on efficiency, except provided blank-correction performed. Results As, Cd 4.40 ± 0.04, 0.224 0.002 17.3 0.8 mg kg−1, respectively (n = 3), all recommended ranges.