Ed Navarre - Development of an N-methyl pyrrolidone based method of analysis for lead in paint

Version 1

      Publication Details (including relevant citation   information):

      Navarre, Edward C., Bright, Leonard Kofi, Osterhage, Amanda,   Lada, Bryan, Anal. Methods, 2012,   4 (12), pp 4295-4302

      Abstract:

      A method suitable for the field determination of lead-containing   paint by atomic absorption was developed. N-Methyl pyrrolidone   (NMP) was used as a pretreatment to soften the paint samples. No   heating, mechanical grinding, or other chemical treatments were   necessary prior to final sample dilution. Addition of 2% nitric   acid was sufficient to dissolve the lead species in as little as   30 minutes. The total sample preparation time was 60 minutes.   Using FAAS, ICP-MS, and portable ETAAS, the proposed method was   found to give results equivalent to the NIOSH 7082 acid digestion   method for a lead paint SRM and several laboratory samples. The   proposed method used only two reagents (NMP and dilute nitric   acid) to prepare the sample for analysis which makes it   specifically suited for determinations performed outside of a   traditional laboratory. The presence of NMP in solution required   the use of an internal standard to avoid positive bias in ICP-MS   analysis. FAAS showed a small negative bias from NMP in solution.   Accurate ETAAS determinations required the use of a phosphate   matrix modifier. Raman spectroscopy of acidic NMP solutions   revealed that the NMP was not chemically degraded under the   conditions used for lead determination. However, at higher acid   concentrations, loss of the N-methyl was observed.

      Address (URL): http://dx.doi.org/10.1039/C2AY25926E