Correlation of HPLC, XRF NAA Instrumental IPBC Measurement Methods in Wood Materials

摘要

The use of Iodo-Propynyl-Butyl Carbamate (IPBC) is a well-known biocide additive for many wood treatment applications and there are several well-established instrumental analytical methods (extraction HPLC, XRF, and NAA) that have been standardized within AWPA. There have been questions regarding the use of XRF and NAA because they measure Iodine rather than IPBC. There have also been questions regarding measurable limits of IPBC when using extraction high performance liquid chromatography (HPLC). The irreversible molecular interactions, possible hydrogen bonding, and van der Waals interactions, formed between IPBC and hydroxyl groups from wood components, as well as the capillary forces existing in the wood cell lumen, may inhibit the extraction ofIPBC. Solid phase extraction (SPE) concentration, therefore, was used to improve the detection limit of UV-HPLC. Non-destructive X-Ray Fluorescence (XRF) surface analysis can look at either a discrete surface or a ground-up composite of the wood to measure the elemental Iodine part of the IPBC. The "bulk" measurement capabilities of Neutron Activation Analysis (NAA) generally give greater sensitivity than XRF because NAA evaluates the whole wood sample. This paper will compare a preliminary examinationof the relative accuracy, precision, and sensitivity of these various technologies.