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Elemental composition of Indian marine algae - A biogeochemical perspective

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Title Elemental composition of Indian marine algae - A biogeochemical perspective
 
Creator Rao, Ch Kesava
 
Description 167-177
Data on elemental composition of 31 elements in about 120 algae (not all elements in all algae) from Indian coast are compiled and their concentration factors (CF) are calculated. Relatively wide spread ranges are recorded for almost all elements in algae. Seasonal data show that the concentrations of Na, K, Ca, Mg, S, F, Cl, Br, I, B, etc. were recorded higher during early growth stages, thereafter they were irregular. C is found to be lower while N and P were minimum during early growth but in senescent period higher C content and lower N and P arc recorded. Accumulation of Mn, Cu, Ni, Co, Zn, etc. were found to be low during early growth and higher in later stages of growth. Trace elements' accumulation is more related to phenological stages of algae rather than ambient medium concentration, if the latter is not limiting for the algal growth in unpolluted waters. The regularity of CF of elements in algae follows the geochemical principles such as residence time (tau) and bond energy (chemical bonding) properties of elements i.e. I(ev) (ionisation energy), e2/Mr (charge to radius and mass), kappa (electronegativity) etc. which control seawater-rock partition coefficients. The relative position of elements is fairly coherent on least square fitting line between CF and the above bond energy functions indicate the unifying concept of bond energy relationship of elements' distribution in algae. Since similar relationship exists with tau in 3 groups of algae, their CF values in terms of Y/Y0 (ratio between the actual CF of an element and that of the theoretical one) can be used as an indication of the characteristic of each element distribution in algal groups. Y/Y0 and ionisation energy plot shows 3 distinct regions. The bulk and basic constituents C, N, O, P, etc. with other polyvalent elements; alkali metals and halides respectively occupied in the region where log I(ev) > 1.4 and < 0.7 are non-toxic and the elements occupied in the region where log I(ev) 0.76-1.4 are divalent metals including certain toxic metals such as Pb, Cd, Cu, etc.
 
Date 2016-12-02T07:14:24Z
2016-12-02T07:14:24Z
1992-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/38088
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.21(3) [September 1992]