New application of lanthanum-modified bentonite (Phoslock®) for immobilization of arsenic in sediments

October 10, 2020

Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, use EasySensor DGT devices (probes) and HR-Peeper to publish the article as below:


Lanthanum-modified bentonite (LMB, Phoslock®) is a well-known capping agent for phosphorus immobilization in sediments.
Herein, LMB was used to immobilize As in sediments. Batch capacity experiments for arsenate and arsenite adsorption were
carried out to obtain adsorption isotherms and kinetics using the Langmuir and Freundlich model calculations. High-resolution
(HR) diffusive gradients in thin films (DGT) were applied to monitor the changes of weakly bound As fraction near sediment–
water interface (SWI). The interaction of As(III) and As(V) with LMB was influenced by pH and initial mineral composition.
As(V) was more obviously adsorbed than As(III) at pH 4 to 9, with mean adsorption of 3.89 mg g−1 and 0.04 mg g−1
respectively, while at pH > 9 As(III) was preferentially adsorbed. After LMB amendment for 2 months, the maximum As
removal efficiency in the pore and overlying water reached 84.5% and 99.3%, respectively. The capping agent remained stable
in the top sediments, while the maximum DGT labile As content decreased to 0.89 and 0.51 μg L−1 in dosage-and timetreatments. The As concentration inflection point moved down to a deeper layer. As species changed from labile
exchangeable–As to Fe–oxide–bound and residual As. The proportion of mobile As finally decreased to 10.5% of the total As
in the upper 20-mm layer sediment. The increase of Kd (the distribution coefficient at SWI) and k1 (adsorption rate constant) and
the decrease of Tc (response time of (de)sorption) in the DGT–induced fluxes model (DIFS) indicated the time-dependent
impediment of As release from the sediment due to LMB immobilization.

Keywords Arsenic . Phoslock® . Sediment . Zr-oxide DGT . Capping

Writers: Jingzhen Cui, Dan Wang, Juan Lin, Yan Wang, Mingyi Ren, Youwei Yang, Pengling Shi