Background

Wood treatments are used to protect lumber from fungi, insects, UV damage and general wear. In recent years, the US EPA has asked for voluntary compliance to restrict the use of chromated copper arsenate (CCA), due to concerns of Cr and As leaching into soils. Lumber treated with CCA is used in a limited number of situations, such as in roofing shingles, permanent building foundations, and certain commercial applications. When treating wood, the proper balance of treatment solution must be monitored to ensure the highest quality while minimizing waste and excess cost due to treatment usage or product rejection. Cr, Cu and As levels are monitored in solution prior to treatment, and then in the wood to ensure proper retention. A quick, simple, reliable means of analysis is required throughout the quality control process. XRF is an ideal tool for such analysis.