I have measured the concentration of major elements in lagoon sediment using neutron activation analysis, and I had found that Mn was significantly correlated with all elements except Fe (-0.40%). how do i explain this result ?
Dear Nezha,
Typically Fe and Mn are indeed (positively) correlated. However, when dissolved Fe(II) is introduced in a Mn-oxide containing zone, the reduction of these oxides by Fe(II) results in a depletion of Mn-oxides and enrichment in Fe-oxide in the sediment. If this process is significant it would distort the Mn-Fe correlation till the point where all Mn-oxides have depleted. I'm attaching a recent publication where we observed this process. Not knowing the conditions in your lagoon, this might or might not be a usefull explanation for your observation. Let me know what you think :)
Good luck with your research,
Niels
Dear Niels
Thank you, I really appreciate your help.
We had explain this result in our first paper (Mejjad & al, 2016) that this behavioural difference between Fe and Mn is mainly due to changes in the formation and precipitation of Fe and Mn oxyhydorxides, and also to their different degree of redissolution in prevailing redox conditions in sediment depth (Lavilla, & al; 2006). But i need to know, to search and to find the good explanation.
- Lavilla I, Filgueiras AV, Valverde F, Millos J, Palanca A, Bendicho C (2006) Depth profile of trace elements in a sediment core of a high-altitude lake deposit at the Pyrenees, Spain. Water Air Soil Pollut 172(1–4):273–293
- Mejjad N, Laissaoui A, El-Hammoumi O, Benmansour M, Benbrahim S, Bounouira H, Benkdad A, Bouthir F. Z, Fekri A, Bounakhla M (2016) Sediment geochronology and geochemical behavior of major and rare earth elements in the Oualidia Lagoon in the western Morocco. J Radioanal Nucl Chem DOI 10.1007/s10967-016-4714-8.
Thank you again :)
My Best regards
Nezha
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