NDLI: Effect of pH and salinity on flocculation process of heavy metals during mixing of Aras River water with Caspian Sea water

Content Provider	Springer Nature Link
Author	Karbassi, A. R. Heidari, M. Vaezi, A. R. Samani, A. R. Valikhani Fakhraee, M. Heidari, F.
Copyright Year	2013
Abstract	The flocculation process of metals can play an effective and important role in self-purification of metals during the mixing of freshwater with seawater in estuary. Such processes are of highly ecological and biological importance. The present study deals with the effect of pH and salinity on the flocculation process of dissolved Cu, Mn, Ni, Zn and Pb on a series of mixtures with salinities ranging from 0.5 to 2.5 ‰ with various pHs values (pH 7, 7.5 and 8) during the mixing of the Aras River water with the Caspian Sea water. The flocculation trend of Pb (100 %) > Ni (62.5 %) > Zn (30.43 %) > Mn (25 %) > Cu (18.18 %) at different salinity regimes (0.5–2.5 ‰) at pH 7, indicates well that Pb, Ni, Zn and Mn have non-conservative behavior and Cu has relatively conservative behavior. At various salinity ranges (0.5–2.5 ‰) and pH 7.5, the flocculation trend of Pb (100 %) > Ni (62.5 %) > Mn (37.5 %) > Cu (24.24 %) > Zn (17.39 %) indicates that Pb, Ni, Mn and Cu have non-conservative behavior and Zn has relatively conservative behavior. Also, the flocculation trend of Pb (100 %) > Zn (78.26 %) > Ni (62.5 %) > Mn (37.5 %) > Cu (15.15 %) at different salinities (0.5–2.5 ‰) and pH 8, indicates that Pb, Zn, Ni and Mn have non-conservative behavior and Cu has relatively conservative behavior. Cluster analysis indicates Mn and Ni are mainly governed by salinity. According to the mean annual discharge of the Aras River (5,323 × 10$^{6}$ m$^{3}$/year), the annual discharge of dissolved Cu, Mn, Ni, Zn and Pb into the Caspian Sea would reduce from 175.66, 85.17, 85.17, 1,224.29 and 53.23 to 149.04, 53.23, 31.94, 266.15 and 0.00 ton/year, respectively.
Starting Page	457
Ending Page	465
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	72
Issue Number	2
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-12-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Element Concentration Purification Mechanisms Conservative Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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