Patterns of accumulation of airborne organochlorine contaminants in lichens from the Upper Great Lakes region of Ontario

Article Abstract:

Lichen samples from 35 sites in Ontario have been used to look at the possibility of using lichen to monitor airborne deposition of PCB congeners and organochlorine pesticides. The dispersal of semivolatile organic contaminants is thought to be closely linked with terrestrial vegetation, but the study showed that lichen samples can only indicate significant spatial trends, with temporal trends requiring a longer study period than the three years in question. However, air-plant bioconcentration factors could be generally useful in predicting air concentrations of semivolatile organochlorines.

Lichens

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Measurement of complexation of methylmercury(II) compounds by freshwater humic substances using equilibrium dialysis

Article Abstract:

A study aimed at investigating the binding properties of humic substances (HS) in relation to methylmercury(II) through the use of equilibrium dialysis technique is presented. The experiment made use of the technique primarily to differentiate between bound fractions and unbound fractions of MeHg(II). The results of the experiments indicate that there is no significant loss of MeHg(II) from solutions containing 0.5-100 ng/L MeHg(II) and 10 mg/L humic substances over a 24-h time interval.

All Other Basic Inorganic Chemical Manufacturing, Measuring & controlling devices, not elsewhere classified, Other Measuring and Controlling Device Manufacturing, Water Treatment Analyzers, Industrial inorganic chemicals, not elsewhere classified, Inorganic Mercury Compounds, Methods, Analysis, Water, Filters (Separation), Water treatment equipment, Water pollution testing equipment, Methylmercury, Methylmercury compounds, Water analysis

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Observation of unusual organic mercury species in soils and sediments of industrially contaminated sites

Article Abstract:

Several industrially contaminated sites in Germany and Slovenia were studied to determine the presence of organic mercury compounds. The results showed that significant concentrations of methylmercury and organomercury compounds were present in all the sites. The main organomercury species detected in the sites were ethylmercury, methoxyethylmercury, ethoxyethylmercury and phenyl-mercury.

All Other Basic Organic Chemical Manufacturing, Organomercury Compounds, Industrial sites, Organic compounds, Mercury, Mercury (Metal), Organometallic compounds

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