130 An Exposure Assessment of dust- and Respirable Quartz Levels During Indoor Renovations

Abstract Construction workers are exposed to a complex mix of inorganic dust and other components. Workers doing interior demolition and renovation work are particularly at risk as the work operations can produce large quantities of dust in areas with low ventilation. The aim of this work is to assess the dust- and respirable quartz levels that workers in the construction industry are exposed to. An additional goal with the study is to investigate the inorganic components present in the respirable dust fraction using Rietveld as a multicomponent analysis with XRD. Workers in the construction industry have been carrying personal respirable air samplers during work with concrete and building bricks. Quartz content in respirable air samples is determined by X-ray powder diffraction (XRD) by using the NISOH 7500 method. Gravimetric analysis of 67 respirable dust samples gave a mean of 1.34 mg/m3 (min 0.028 mg/m3 to max 6.0 mg/m3). Initial determination of quartz content by XRD revealed a mean of 0.109 mg/m3 (n=52) respirable quartz, with a minimum, maximum and median of 0.0074 mg/m3, 0.60 mg/m3 and 0.045 mg/m3 respectively. The X-ray diffractograms show a complex mixture of inorganic components. These results show that construction workers may be exposed to levels above the current OEL for respirable quartz. It is therefore important to measure the quartz levels in this industry.