U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of
the Technical Meeting Charleston South Carolina March 8-12, 1999--Volume 1 of
3--Contamination From Hard-Rock Mining, Water-Resources Investigations Report
99-4018A
Development of a Passive Integrative Sampler for Labile Metals in Water
By William G. Brumbaugh, Jimmie D. Petty, James N. Huckins, and
Stanley E. Manahan
ABSTRACT
A Stabilized Liquid Membrane Device (SLMD) is described for potential
use as an in-situ passive integrative sampler for Cd, Cu, Ni, Pb,
and Zn in natural waters. The SLMD (patent pending) consists of a 15
cm long strip of low-density polyethylene (LDPE) layflat tubing
containing 1 mL of an equal mixture (v/v) of oleic acid
(cis-9-octadecenoic acid) and Kelex-100®
(7-[4-ethyl-1-methyloctyl]-8-quinolinol]). The reagent mixture
diffuses in a controlled manner to the exterior surface of the
LDPE membrane, which results in a relatively constant
sequestration rate of several divalent metals for at least four
weeks. Concentration factors of several thousand can be realized
after just a few days allowing for extraction and quantitation of
extremely low elvels of these metals by common spectroscopic
methods. Data is presented for field deployment of SLMDs at two
sites impacted by hard rock mining. Effects of pH and flow-rate on
the SLMD sampling rate is discussed.
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