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lead and zinc
Test Determination of Lead and Zinc in Water with the Use of Xylenol Orange Immobilized on Silica
      
The results obtained in determining ions of lead and zinc in the case of their simultaneous presence in solution and comparative characteristics of various calibration models are presented.
      
Geology and structural features of vein-type lead and zinc deposits
      
Part of lead and zinc in fluids can be transported by organic complexes, while their precipitation is caused by organic reduction.
      
Increased sister chromatid exchanges in workers exposed to occupational lead and Zinc
      
Understanding relationships between cationic metals such as cadmium, copper, nickel, lead and zinc, and amorphous iron sulfides, measured as acid volatile sulfide (AVS), is key to predicting metal bioavailability and toxicity insediments.
      
clearly demonstrates such temporal trends for three commonly occurring heavy metals (copper, lead and zinc) within saltmarshes whose accretion period has spanned the last few centuries.
      
The mechanisms of paragenesis and separation of silver, lead and zinc in hydrothermal solutions
      
On the basis of an experimental study and thermodynamic calculation, the mechanisms of paragenesis and separation of silver, lead and zinc in the hydrothermal system have been studied.
      
With decreasing temperature, [Cl-],fo2 and increasing pH, the solubilities of silver, lead and zinc will decrease, leading to their deposition and separation.
      
Investigation of lead and zinc dispersion from an abandoned mine site at Tyndrum, Scotland, using tree bark measurements
      
Distribution of gold, silver, copper, lead and zinc in the productive Marysville stock, Montana
      
125 whole rock samples from the productive Marysville, Montana, granodiorite and the surrounding metamorphic rocks were analyzed by neutron activation analysis for gold and silver, and by atomic absorption for copper, lead and zinc.
      
An evaporitic environment which favoured dolomite formation concentrated lead and zinc in the overlying solutions.
      
It is postulated that during sedimentation, formation of lead and zinc sulphides depleted an already limited sulphur supply to the point where the field of FeS stability was entered.
      
Present-day precipitation of lead and zinc from groundwaters
      
Geochemical dispersion of lead and zinc around a gossan in a carbonate environment at Heure (Belgium)
      
Soils with anomalous values in lead and zinc lying adjacent to the gossan contain fragments of ferruginous material which possess dimensions ranging from hundreds of microns to several centimeters.
      
Lead and zinc anomalies can be explained partly by the occurrence of limonitic microfragments in the anomalous soils.
      
Already evoked by others authors for mainly non-carbonate environments, the results weight to the hypothesis that the dispersion of lead and zinc is partly mechanical.
      
 

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