Distribution of particulate, colloidal, and dissolved mercury in San Francisco Bay estuary. 2. Monomethyl mercury

...Partition coefficients (Kd) for Hg have been consistently reported as very high in San Francisco Bay [17,18] and estuarine systems elsewhere [19,20]...
...Conaway et al. [17] reported HgT concentrations of 1.2 to 46 ng/L in the North Bay and the lower end of the Sacramento and the San Joaquin Rivers, and Choe et al. [18] found HgT concentrations ranging from 4.0 to 20 ng/L also in the northern part of San Francisco Bay...

...Previous studies have employed tangential flow ultrafiltration, which requires several liters of water, and have used membranes with a molecularweight cutoff of 1,000 Da [26] or 10,000 Da [27]...
...This is supported by the observation that a significant fraction of dissolved Hg is associated with large organic complexes or colloidal matter [26,37], which is more hydrophobic than Hg associated with small organic molecules...

...Choi et al., 1998; Cain et al., 2000), water (e.g. Choe et al., 2003), and sediment (e.g...

...Historic inputs of mercury are chronicled in radiocarbon-dated sediment cores and surface sediment distributions, which are reflected in surface water distributions (Choe and Gill, 2003; Choe et al., 2003; Conaway et al., 2003)...
...The distribution of mercury in surface sediments mirrors the distribution of mercury in surface waters of San Francisco Bay (Choe and Gill, 2003; Choe et al. 2003; Conaway et al., 2003) (Fig. 6). Concentrations of dissolved (<0.45 lm) mercury are relatively high in the northern region (� 10 pM), relatively low in the Central Bay (� 2 pM), and relatively high in the southern region (� 10 pM)...
...Others have reported on the biogeochemical cycling and/or speciation of chromium (Abu-Saba and Flegal, 1995, 1997; Abu-Saba et al., 2000), cobalt (Tovar Sanchez et al., 2004), lead (Kozelka et al., 1997); manganese (Roitz and Bruland, 1997; Roitz et al., 2002), mercury (Thomas et al., 2002; Choe and Gill, 2003; Choe et al., 2003), and silver (Smith and Flegal, 1993; Miller and Bruland, 1995) in the Bay, as well as on some multi-elemental ...

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