The prepared material contains about 80% of carbon, together with relatively low levels of Al, Ca and heavy metals. Certified values are provided for Al, As, Ca, Cd, Co, Cr, Cu, K, Mg, Na, Ni, Pb, Sb, Sr, V and Zn, while reference values are reported for Ag, Br, Ce, Cs, Eu, La, Lu, Mo, P, Rb, Sc, Se, Sm and Th. The elemental composition of NIES Vehicle Exhaust Particulates is considered typical of automobile emission particulates.
The material for this reference material was collected from electrostatic precipitators in huge ventilators connected to a highway tunnel. The electrostatic precipitators were situated between cloth filters. Preliminary analysis demonstrated that little of the material caused from pavement. keywords: environmental material , particulate material , trace elements , heavy metals |
