Trace Metals in the Waters of the Gulf of St. Lawrence

Abstract

Concentrations of the trnce elements iron. cobalt. nickel. copper, zinc, cadmium, and lead were measured in samples collected from the waters of the Gulf of Sr. Lawrence. Cobalt, cztdmii~m, and lead occurred at or beIow rhe delection limits of the analytical method. The mean concentrations of nickel, copper, and zinc were 0.4 rgl-'. 0.6 figl-' and 1.8 rgl-l respectively, and there was no evidence that local conditions influence their distrihution. The distribution of dissolved and colloid:tl iron is related to dilution and precipitation processes which occur as fresh and saline waters are mixed. The particulate iron distribution is largely governed by water circulation patterns and settling. Les concentrations des 616ments en trace, fer, cobalt, nickel, cuivre, zinc, cadmium, et plomb, dans des Cchantillons recueillis dans les eaux du Golfe du Saint-Laurent ont ttC mesurks. Le cobalt, le cadmium, et le plomb se trouvent prks ou en dessous des limites de detection des mkthodes analytiques. Les concentrations moyennes du nickel, cuivre, et zinc sont 0.4 pgl-', 0.6 figl-' et 1.8 figl-' respectivement, et il n'y a pas d'kvidence que les conditions locales influencent leurs distributions. La distribution du fer dissous et colloide est like aux prockdks de dilution et de prkcipitation qui prennant place lors du mklange des eaux douces et salines. La distribution du fer particulaire est largement fonction de la circulation et de la sedimentation.[Traduit par le journal]

Metals removal during estuarine mixing of Arvand River water with the Persian Gulf water

“…Many researchers have reported rapid flocculation in the earlier stages (at a salinity of about 2‰) of the mixing process [21][22][23] ,which is in agreement with the results of this study. On the other hand, more distributed removal in terms of salinity has been reported for studies on the riverine mixings with the Caspian Sea as a lake [12][13][14]20].…”

Nickel sorption and speciation in a marine environment

“…The concentrations of total dissolved Ni in seawater were calculated using Eqs . 8 and 9 and are in agreement with the reported literature (Bewer et al, 1974 ;Boyle et al, 1981 ;Rutzel et al ., 1982 ;Sclater et al, 1976). The concentrations of chloro-complexes of Ni increased as the salinity of seawater increased .…”

Flocculation of dissolved Mn, Zn, Ni and Cu During the mixing of tadjan river water with caspian sea water

“…In the case of Mn, flocculation occurs rather late in the mixing process (salinity 5.5%). Many researchers have reported rapid flocculation in the earlier stages (at salinity about 2%) of the mixing process [17][18][19]. The relationship between metals and the physical/chemical characteristics of mixtures was investigated (Fig.…”