Determination of lead in fine particulates by slurry sampling electrothermal atomic absorption spectrometry.
A simple method for determining lead in fine particulates (PM2.5) by using electrothermal atomic absorption spectrometry (ETAAS) has been developed. Particulates collected on Nuclepore filter by using a dichotomous sampler were suspended in diluted nitric acid after ultrasonic agitation. The dislodging efficiency is nearly 100% after agitation for 5 min. In order to study the suspension behavior of PM2.5 in solvents, a Brookhaven ZetaPlus Particle Size Analyzer was used to determine the particle size distribution and suspension behavior of air particulates in the solvent. The pre-digestion and modification effect of nitric acid would be discussed. Palladium was added as a chemical modifier and the temperature program of ETAAS was changed in order to improve the recovery. The slurry was introduced directly into a graphite tube for atomization. The metal content in the sample was determined by the standard addition method. In addition, a conventional acid digestion procedure was applied to verify the efficiency of the slurry sampling method. It offers a quick and efficient alternative method for heavy metal characterization in fine particulates.
Department of Chemistry, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
J C
JC
Yu
K F
KF
Ho
S C
SC
Lee
D004787:Environmental Pollution / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D010165:Palladium; D015203:Reproducibility of Results; D012997:Solvents; D013054:Spectrophotometry, Atomic / Q000379:methods
D012997:Solvents; D007854:Lead; D010165:Palladium