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Dunlap, C.E., Steinnes, E. and Flegal, R.A. (1999) A Synthesis of Lead Isotopes in Two Millennia of European Air. Earth and Planetary Science Letters, 167, 81-88.
https://doi.org/10.1016/S0012-821X(99)00020-5

has been cited by the following article:

• TITLE: Trace Metal Concentrations in Pine Needles at Varying Elevation in Proximity to Roadways in an Urban Environment

  AUTHORS: Graham Brown, Isabella Luu, Gwen O’Sullivan

  KEYWORDS: Trace Metal Deposition, Biomonitoring, Non-Point Sources, Atmospheric Deposition

  JOURNAL NAME: Journal of Environmental Protection, Vol.8 No.6, June 28, 2017

  ABSTRACT: Conifer needles bioaccumulate atmospheric pollutants, including trace metals, and may be used to monitor variations in atmospheric concentration. Needles were analyzed to determine whether a correlation exists between elevations and trace metal concentrations in proximity to roadways and other non-point sources. Composite samples of white spruce (Picea glauca) and balsam fir (Abies balsamea) needles were collected along hillsides in eastern and western Calgary, respectively. A combined total of 11 sites was sampled along two transects of increasing elevation. Qualitative and quantitative analysis of trace metal concentrations was completed using inductively coupled plasma-mass spectrometry (ICP-MS) and synthesized using regression analysis. The concentrations of cobalt, nickel, and calcium in the samples were found to exhibit a significant (P