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REE geochemistry of seawater from Afanasy-Nikitin Seamount in North Central Indian Ocean by high resolution inductively coupled plasma mass spectrometry

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Title REE geochemistry of seawater from Afanasy-Nikitin Seamount in North Central Indian Ocean by high resolution inductively coupled plasma mass spectrometry
 
Creator Balaram, V
Roy, Parijat
Subramanyam, K.S.V.
Durai, L.
Mohan, Ram M.
Satyanarayanan, M.
Sawant, S.S.
Kamal, Kalyan S. S.
Vani, K.
 
Subject Sea water
Rare earth elements
Afanasy-Nikitin Seamount
Indian Ocean
HR-ICP-MS
HDEHP
Ce-anomaly
 
Description 339-347
REE (Rare Earth Elements)  and yttrium in sea water samples, from the
Afanasy-Nikitin Seamount (ANS) located around 3o South latitude and
83o East longitude in the north central Indian Ocean were precisely
determined by high resolution inductively coupled plasma mass spectrometry
(HR-ICP-MS) method. A modified procedure has been designed for determination of
REE and yttrium wherein the water samples were subjected to a pre-concentration
step using bis-2-ethylhexyl phosphoric acid (HDEHP) complexing agent. Sea water
reference materials such as NASS-5 and SLEW-3 were used for calibration as well
as to check the accuracy of the procedure adopted.  Samples were analyzed for REE and yttrium by
HR-ICP-MS. Precisions achieved for various rare earths and yttrium is better
than 8% RSD with comparable accuracies. Limit of detection (3σ) were generally
in the range of 0.02-1.2 pg/ml range for all these elements. This method facilitates rapid and interference-free
determination of REE and yttrium from relatively small volume of sea water (10
ml).  Recoveries for different REE and Y
were better than 5%, and accuracy and precision of the determinations are
within 8% RSD. The Ce-negative anomalies with
smooth normalized-REE patterns obtained for both certified reference materials
and samples further substantiate that the procedure adopted and the data
generated are extremely accurate. A slight enrichment of heavy REE were
observed in the central Indian Ocean waters
which might be attributed to the river flows containing more dissolved trace
elements including REE. A sharp negative Ce-anomaly in the normalized REE
distribution patterns indicates that the source of REE in particular Ce in
marine sediments is seawater. Results of the variation in REE concentrations
with depth indicated that the physico-chemical conditions of bottom ocean water
follow a very complex mechanism.
 
Date 2016-07-05T09:40:53Z
2016-07-05T09:40:53Z
2015-03
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34687
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(03) [March 2015]