tms - Speciation and analysis of trace metals in aquatic...

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Speciation and analysis of trace metals in aquatic systems Trace metal speciation: description of the physical or chemical forms of an element or compound in an aquatic system A. physical-chemical forms particulate: adsorbed intracellular mineral solid dissolved: (passes through 0.2 μm filter) free metal ion: Fe 3+ , Zn 2+ , Hg 2+ , Ag + “inorganic” species inorganic complexes: CuCO 3(aq) , CdCl - organic complexes: CuEDTA 2- , Cu L –––> less bioavailable than inorganic metal complexes redox states: Fe 2+ , Fe 3+ Hg 2+ , Hg° B. Analysis of trace metals in aquatic systems 1. sample collection and handling: “trace metal clean techniques” acid-leached, plastic or teflon bottles acid-leached, plastic or teflon pumps acid-leached, plastic or teflon filters vinyl gloves rubber boat clean room or laminar flow hood with HEPA (high efficiency particulate air) filter; removes 99.99% particles 0.3 μm 2. sample preparation: total metal concentration (dissolved + particulate)
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tms - Speciation and analysis of trace metals in aquatic...

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