@article{fdi:010069348,
  title = {{I}mpact of water-particle interactions on molybdenum budget in humid tropical rivers and estuaries : insights from {N}ethravati, {G}urupur and {M}andovi river systems},
  author = {{G}urumurthy, {G}. {P}. and {T}ripti, {M}. and {R}iotte, {J}ean and {P}rakyath, {R}. and {B}alakrishna, {K}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he study presents the seasonal and inter-annual monitoring of molybdenum ({M}o) distribution and variability in humid tropical riverine and estuarine systems ({N}ethravati, {G}urupur and {M}andovi estuaries) of west coast of {I}ndia. {T}he study investigates the geochemical behaviour of {M}o in the river and estuaries, and their ultimate fluxes into the ocean. {T}he riverine flux of dissolved {M}o ({DM}o) to the {N}ethravati, {G}urupur and {M}andovi estuaries are 1800 mol yr(-1) (4.88 mol day(-1)), 195 mol yr(-1) (0.53 mol day(-1)) and 10.5 x 10(3) mol yr(-1) (28 mol day(-1)) respectively, and the riverine particulate {M}o ({PM}o) flux to {N}ethravati estuary is 10.8 x 10(3) mol yr(-1). {T}he {DM}o in river (similar to 30 to 40%) is scavenged onto particles under oxidized acidic river water conditions and subsequently released in the estuary, impacting the solute budget of {M}o to the sea. {I}n the estuaries, under low salinity conditions, {DM}o is sequestered onto particles during pre-monsoonal season. {T}he {DM}o sequestration in the estuary is estimated to be similar to 2 mol day(-1) in the {N}ethravati estuary and similar to 1.9 mol day(-1) in the {M}andovi estuary. {D}uring this season sequestration in the estuary is higher than the riverine supply, indicating the sequestration of both marine and river borne {DM}o. {H}owever, the mechanisms involved in the removal process are different in these estuaries viz. oxidative adsorption process in the {N}ethravati-{G}urupur estuary and microbial utilization in the {M}andovi estuary. {T}he lower salinity region during monsoon and post-monsoon season shows slight excess of {DM}o, river borne particulate {M}o could release up to 3 to 4 nmol {L}-1 by desorption under alkaline higher ionic strength conditions. {A}t higher salinity (>20 psu) in both the estuaries and in all the seasons, {DM}o gain is systematic (similar to 1 to 37 nmol {L}-1). {M}o release from river borne particles could contribute only up to 3 to 4 nmol {L}-1, which is not sufficient to balance the observed {M}o excess. {O}n the other hand, the reductive {M}o remobilization from bottom sediments ({M}o = 4 mg kg(-1)) during sediment diagenesis and subsequent tidal activity, release up to 28 nmol {L}-1 of {DM}o to the estuarine water. {M}o release to water column is supported by the gradual enrichment of {DM}o with depth in the estuary. {T}herefore, diagenetic release of {DM}o forms the potential source of {DM}o excess in the estuary.},
  keywords = {{M}olybdenum ; {N}on-conservative behaviour ; {M}icrotidal estuary ; {S}cavenging ; {S}outh {I}ndia ; {INDE} {SUD} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {450},
  numero = {},
  pages = {44--58},
  ISSN = {0009-2541},
  year = {2017},
  DOI = {10.1016/j.chemgeo.2016.12.008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069348},
}