Insoluble trivalent and tetravalent elements Sample Clauses

Insoluble trivalent and tetravalent elements. Within the Vostochniy watershed, Al concentration steadily decreases by a factor of 2 downstream from soil solution (OR-9) until the river mouth (OR-1) and further by a factor of 6 towards the terminal lake (OR-8). Ga concentration varies non-systematically between 0.004 and 0.02 µg/L with the minimal values observed in humic lakes (OR-2, OR-6). Likewise, REE concentrations are similar among all samples with the values in the terminal lake OR-8 being a factor of 4 to 5 smaller than in the others. Along the Palojoki profile, concentrations of Al, Ga, Y, XXXx change systematically, increasing from the upper clear water Kivakkalampi lake (KAR-7), through intermediate lake (KAR-6) towards the feeding bog (KAR-2), and further decreasing from the middle course (KAR-1) towards the river mouth (KAR-3). Similar to Fe, the tributary KAR-4 likely fed by the groundwaters exhibits the highest Al, Ga, Y, and XXXx concentrations. The tetravalent elements (Ti, Zr, Hf, Th) exhibit the evolution of the concentration that is similar to that of XXXx both within the components of Palojoki river (KAR series) and Vostochniy stream (OR series). The tetravalent elements (Ti, Zr, Hf, Th) concentrations remain fairly constant (±10%) between OR-9 and OR-1 decreasing by 30-50% in the terminal lake OR-8. Similar to Fe, variations of tetravalent element concentrations in the Palojoki stream are significant, increasing from KAR-7 tо KAR-2 by a factor of 3 to 5, and further decreasing, by a factor of 1.5 to 2.0, towards the middle course (KAR-2) and the river mouth (KAR-3).
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