Time, characteristic flushing

Effluents from flooded mines are characterised by a more or less constant flow rate but a characteristic decrease of the contaminant load over time, resulting from the initial flush at the time of flooding and a prolonged tail due to the dilution of the mine water body by infiltration water inflow (which is partly overlain by dissolution, adsorption and precipitation processes within the mine)... 

Intoxication results in a characteristic intense, throbbing headache, presumably due to cerebral vasodilation, often associated with dizziness and nausea and occasionally with vomiting and abdominal pain. More severe exposure also causes hypotension, flushing, palpitation, low levels of methemoglobinemia, delirium, and depression of the central nervous system. Aggravation of these symptoms after alcohol ingestion has been observed. On repeated exposure, a tolerance to headache develops but is usually lost after a few days without exposure. At times, persistent tachycardia, diastolic hypertension, and reduced pulse pressure have been observed. On rare occasions, a worker may have an attack of angina pectoris a few days after cessation of repeated exposures, a manifestation of cardiac ischemia. Sudden death due to unheralded cardiac arrest has also been reported under these circumstances. ... 

The estuaries chosen for the studies were the Gironde and Loire estuaries (France) both caracterized by relatively long flushing and residence times (Martin, Mouchel and Thomas, 1984) as well as by a well developped turbidity maximum. Their general characteristics have been described previously (Allen, 1972 Barbaroux, 1980 Elbaz-Poulichet et al., 1982, 1984). 

Stored DDT and dieldrin present in lake trout eggs at spawning time can affect the ultimate survival of the young (ref. 82c). Oyster growth is inhibited even at low concentrations of DDT. This characteristic growth sensitivity of a number of mollusks to DDT, and the rates at which DDT is flushed out when the mollusk is transferred to fresh water, has been used as a pesticide monitoring tool (Butler, ref. 82d). 

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