FN Archimer Export Format
PT J
TI Assessing exchangeable phosphate and related data in coastal sediments: Theoretical and practical considerations
BT 
AF ANDRIEUX-LOYER, Francoise
   AMINOT, Alain
AS 1:1;2:1;
FF 1:PDG-ODE-DYNECO-PELAGOS;2:;
C1 Ifremer, DYNECO, F-29280, Plouzané, France
C2 IFREMER, FRANCE
SI BREST
SE PDG-ODE-DYNECO-PELAGOS
IN WOS Ifremer UPR
IF 2.8
TC 1
UR https://archimer.ifremer.fr/doc/00815/92698/99004.pdf
LA English
DT Article
DE ;Exchangeable phosphate;Sediment;Langmuir;Adsorption;Desorption
AB This article deals with the adsorption-desorption processes of phosphate on sediments according to the Langmuir theory. The theoretical developments are described and applied to the experiments which enable the determination of phosphate that is exchangeable with surrounding water (exch-P). Langmuir equation parameters such as the partition coefficient and the maximum adsorption capacity for exchange of phosphate between solid and water are assessed and discussed. The dataset consisted of contrasting sediments gathered over fifteen years from a large number of coastal and estuarine areas. The determination of exch-P was carried out with linear and asymptotic computations. The values, ranging from a few tenths of μmol g−1 in sandy sediments up to approximately 9 μmol g−1 in muddy sediments, are slightly more precise by using the linear computation. Partition coefficients (Kp: 0.03–3.8 L g−1), increasing with the proportion of fine particles, are likely related to the Fe content. It is proposed to use Kp as a criterion for the examination of the potential exchange of phosphate with the surrounding water. The maximum phosphate adsorption capacity of sediments (Qo) derived from the Langmuir equations exhibits large confidence interval. So, it is not found significantly higher than the exchangeable phosphate, as expected from published sediment saturation experiments. 
PY 2023
PD FEB
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Elsevier BV
VL 281
UT 000976251300001
DI 10.1016/j.ecss.2023.108218
ID 92698
ER

EF