Browsing by Subject "buffer capacity"

Now showing 1 - 3 of 3

Access status: Restricted ,
Ocena potencjalnej migracji $Cd$, $Zn$ i $Pb$ w glebach aluwialnych w dolinie środkowego odcinka rzeki Białej Przemszy
(Data obrony: 2017-07-14) Stroińska, Paulina
Wydział Geologii, Geofizyki i Ochrony Środowiska
Celem pracy było sprawdzenie w jakim stopniu właściwości fizyczno-chemiczne gleb aluwialnych mogą wpływać na migrację cynku, kadmu oraz ołowiu w środowisku wodno-gruntowym. Pobrane zostały dwa głębokościowe profile glebowe zlokalizowane w środkowym odcinku rzeki Białej Przemszy w miejscowości Sławków. Rdzenie poddane zostały analizie laboratoryjnej. Sprawdzono zawartość substancji organicznej i węglanów oraz określono pH – zarówno potencjalne jak i czynne. W kolejnym etapie analizy gleby zbadano pod kątem ich buforowości. Otrzymane wyniki pozwoliły na odnalezienie zależności pomiędzy badanymi czynnikami.
Access status: Open Access ,
Potential effect of pH on the leaching of heavy metals from sediments of the Carpathian dam reservoirs
(Wydawnictwa AGH, 2014) Szarek-Gwiazda, Ewa
Eutrophication processes occurring in the Carpathian dam reservoirs (southern Poland) have resulted in a drastic increase of incidences of decrease of pH and oxygen content in near-bottom water, which may affect metal remobilization from the sediment. The study is aimed to determine the buffer capacity and effects of decreasing pH on the remobilization of heavy metals (Cd, Pb, Cu, Zn, Mn and Fe) from sediments of the Dobczycki Reservoir (DR), the Czorsztyński Reservoir (CR), and the Rożnowski Reservoir (RR), the right side tributary of the Vistula River. Buffering capacity and the leaching of heavy metals from sediments accompanied with an increase in acidity were analyzed in 0.00-0.24 M $HNO_{3}$ solutions. Studied sediments had a high buffer capacity. Buffer capacity of sediments at studied sites of the DR and CR was different due to differences in the composition of sediments. The reservoir sediments had a variable ability to release heavy metals with increasing acidity. At pH ~5 and pH ~3, a considerable leaching of Mn (up to 60% and 85% of the total amount, respectively), Cd (up to 35% and 56% respectively), Pb (up to 25% and 39%), the lower leaching of Cu (up to 18% and 30%) and Zn (up to 14% and 20%), and the lowest leaching of Fe (below 5%) were found. The decrease of pH of the water-sediment system caused by eutrophication processes may affect the mobilization of certain heavy metals (mainly Mn, Cd and Pb) from sediment into the water column of the studied Carpathian reservoirs.
Access status: Open Access ,
The content and composition of organic matter in bottom sediments of the Rybnik reservoir - preliminary studies
(Wydawnictwa AGH, 2018) Baran, Agnieszka; Mierzwa-Hersztek, Monika; Gondek, Krzysztof; Szara, Magdalena; Tarnawski, Marek
Organic matter has important influences on the fate of environmental pollution in water dam reservoirs. The aim of the studies was to assess content of organic matter fractions in Rybnik reservoir bottom sediments, and to determine their influence on the content of heavy metals and PAHs. In three sediment samples, the content of C organic (Corg), C extracted (Cex), C humic acid (Cha), C fulvic acid (Cfa) and C non-hydrolyzed (Cnh), buffer capacity, and content of heavy metals and PAHs was analyzed. We found the highest content of Corg, Cex, Cha, Cfa and Cnh in sample 3 (the outlet, near the dam), while the lowest content was found in sample 2 (middle). The fraction of Cnh was dominant in sediment sample 3 (outlet, near dam) and 1 (inlet), whereas the fraction of Cha dominated in sample 2 (middle). Rybnik bottom sediments are characterized by their high buffer capacities (samples 3, 1) shaped among others by the high content of organic matter. The high organic matter content in samples 3 (outlet) and 1 (inlet) and also high total contents of heavy metals and PAHs in these sediments demonstrate that these pollutants have a strong affinity for organic matter in the sediments. Moreover, the highest mobility of metals, from sample 2 (middle), is connected with the low content of organic matter substances and the low buffer capacities of sediments.