Determination of the external soil fraction (ESF) and the outdoor soil lead contribution (OSLC) for Syracuse, New York

The External Soil Fraction (ESF) is an enrichment factor defined as the fraction of indoor dust derived from outdoor soil. ESF is determined for any house in which data are available on the indoor dust mass loading, indoor metal tracer loading and outdoor soil tracer concentration. The Outdoor Soil Lead Contribution (OSLC) is a calculated fraction of lead in the house dust believed to have originated from the local soil surrounding the home based on the ESF.; Values for the ESF ranged from 0.01 to nearly 20 with a median value of 0.27 as determined by Fe as the soil tracer and 0.26 as determined by Mn as the soil tracer. Similarly, the median values for the OSLC were found to be 0.32 and 0.27 as determined by Fe with and without drip line samples, and 0.30 and 0.24 as determined by Mn with and without drip line samples respectively.