@article {Ince:November 2008:1061-4303:2104,
	author = "Ince, Muharrem",
	author = "Kaplan, Olcay",
	author = "Yaman, Mehmet",
	title = "Solid-Phase Extraction and Preconcentration of Copper in Mineral Waters with 4-(2-Pyridyl-Azo) Resorcinol-Loaded Amberlite XAD-7 and Flame Atomic Absorption Spectrometry",
	journal = "Water Environment Research",
	volume = "80",
	year = "November 2008",
	abstract = "A simple, sensitive, accurate, and selective method for determination of ultratrace levels of copper is modified. The method is based on preconcentration of copper on the 4-(2-pyridyl-azo) resorcinol-loaded amberlite XAD-7 (non-ionic copoly[styrene-acrylic compound]) at pH 5.0 to 6.5 for contact time as low as 45 minutes. The adsorbed copper was eluted with concentrated nitric acid and measured by flame atomic absorption spectrometry. Recoveries of up to 90% were achieved. The optimized preconcentration method was applied to copper determination in various water samples. The detection limit was found to be 0.09 ng mL <SUP>&#8722;1</SUP>. The relative standard deviation was found to be 9% using 300 mL of 5.0 ng mL <SUP>&#8722;1</SUP> for 10 replicate preconcentration procedures. Copper concentrations in the studied water samples were found to be in the ranges of 0.4 to 18.0 ng mL <SUP>&#8722;1</SUP>.",
	pages = "2104-2110(7)",
	url = "http://www.ingentaconnect.com/content/wef/wer/2008/00000080/00000011/art00003"
	doi = "doi:10.2175/106143008X266805"
}