title: Evaluation of chloropyromorphite stability in the rhizosphere of  and  in a sand culture.
abstract: Chloropyromorphite (Pb(PO)Cl), CP, is the most stable lead (Pb) mineral under normal environmental conditions and precipitates in Pb-contaminated soils by addition of phosphorous (P). A sand culture experiment was conducted to evaluate the efficiency of  and  roots to dissolve CP in the presence and in the absence of P source. The results showed that the rhizosphere of the plants had lower soluble P and Pb compared with the bulk, which can be attributed to a higher pH in the rhizosphere. Mineralogical transformations of CP in the root surface of the plants including lanarkite (PbSO.PbO) has been confirmed by X-ray diffraction and scanning electron microscopy techniques. Decrease in soluble P in the rhizosphere as a consequence of P uptake by the plant roots may be a reason for CP dissolution. This study indicates that the dissolution of CP can be promoted by rhizosphere processes.
authors.affiliation: Department of Soil Science, Shahrood University of Technology, Shahrood, Iran. abbaspour2008@gmail.com
authors.forename: Ali
authors.initials: A
authors.lastname: Abbaspour
authors.forename: Joselito M
authors.initials: JM
authors.lastname: Arocena
mesh_terms: D007854:Lead / Q000378:metabolism; D000455:Medicago sativa / Q000378:metabolism*; D008903:Minerals / Q000378:metabolism*; D009149:Mustard Plant / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D012822:Silicon Dioxide
chemical_list: D008903:Minerals; D010710:Phosphates; C469846:chloropyromorphite; D010758:Phosphorus; D007854:Lead; D012822:Silicon Dioxide