Sequential leaches (sequential extractions) experiment of 62 elements were carried out for assessing the mobility of contaminated heavy metals and metalloids contaminated in natural sediments; river sediments of Oued El Harrach (Algeria) and lagoon sediments of Bizerte (Tunisia), North African Mediterranean coast. Applied extractants for the sequential leaches are: (A) distilled water for extra...

the concentrations of potentially toxic elements (as, sb, and hg) and some trace elements in 36 topsoil samples and 18 agricultural soil samples were measured at the aq-darreh river watershed, nw iran. based on the results of the chemical analysis and comparing them with different standards, it seems that the soils of the aq-darreh river watershed are polluted with as and sb. this pollution res...

Single and sequential extractions are current useful tools for estimating the availability of metals in soils or sediments. Many chemical extraction procedures have been proposed literature, making comparison difficult. This study compares data consistency potential given by four commonly found literature: two single (using dilute HCl EDTA as reactant) (the modified standardized 3-steps procedu...

Riverine suspended particulate matter (SPM) is essential for the delivery of micronutrients such as iron (Fe) to oceans. SPM known consist multiple phases with differing reactivity, but their role in elements oceans poorly constrained. Here we provide new constraints on source and composition reactive from Mackenzie River, largest sediment Arctic Ocean. Sequential leaching shows that river sedi...

Trace element profiles for common divalent cations (Sr, Zn, Ba), rare-earth elements (REE), Y, U, and Th were measured in fossil bones and teeth from the c. 25 ka Merrell locality, Montana, USA, by using laser-ablation ICP-MS. Multiple traverses in teeth were transformed into 2-D trace element maps for visualizing structural influences on trace element uptake. Trace element compositions of diff...

Bisphenol A is a very high volume chemical with estrogenic activity that is used in a wide range of products, including medical equipment such as hemodialyzers. Virtually all people have measurable amounts of BPA, since this chemical readily leaches out of products that contain it. BPA is associated with a wide range of diseases because it alters programming of the expression of genes that are ...

For maximum sucrose production by sugarbeets (Beta vulgaris L.) in southern Idaho, the available soil nitrogen (N) level should be highest during early July, when the plant N uptake (N u p) rate is highest, and lowest by the latter part of August ( 1, 12r. Inadequate N during the early growth stages limits root and sucrose yield, whereas excess N stimulates top growth, increases root impurities...

abstract background iron overload is a major problem in patients with major thalassemia. an effective and safe iron chelator protocol with high compliance rate plays an important role in treatment of these patients. this study was done to assess the efficacy and safety of the sequential deferoxamine and deferasirox protocol in major thalassemia patients in khuzestan province, iran. material and...