<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jiang, Xulin</style></author><author><style face="normal" font="default" size="100%">Juntao Zhao</style></author><author><style face="normal" font="default" size="100%">Zhou, Zehao</style></author><author><style face="normal" font="default" size="100%">Liu, Chuan</style></author><author><style face="normal" font="default" size="100%">Jianhong Huang</style></author><author><style face="normal" font="default" size="100%">Yandi* Hu</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Low-Molecular-Weight Organics Regulate the Composition and Stability of Calcium/Lead Phosphate Coprecipitates: Implications for Lead Remediation</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science &amp;amp; Technology</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2025</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://pubs.acs.org/doi/abs/10.1021/acs.est.5c10391</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">59</style></volume><pages><style face="normal" font="default" size="100%">23519-23529</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Calcium phosphate is widely used for the remediation of lead-contaminated sites, where calcium/lead phosphate coprecipitates (Ca/Pb CoPs) form. This research investigated such coprecipitation with model low-molecular-weight organics (LMWOs), produced in the rhizosphere with representative functional groups, which were found to regulate both the composition (Ca/Pb and C/Pb ratios) and stability (aggregation and transformation) of Ca/Pb CoPs. The strong complexation ability of –SH in&amp;nbsp;l-cysteine with aqueous Ca2+/Pb2+&amp;nbsp;ions inhibited coprecipitation to a great extent. Meanwhile, coprecipitates with lysine containing both –NH2&amp;nbsp;and –COOH had a higher Ca/Pb ratio than those with citrate containing only –COOH, probably due to the elevated local supersaturation caused by both –NH2&amp;nbsp;and –COOH in lysine that attracted phosphate ions and cations, promoting Ca doping in CoPs. Also, the strong binding of both –NH2&amp;nbsp;and –COOH with coprecipitates resulted in a higher C/Pb ratio for the CoPs with lysine than citrate. The oriented aggregation of nano-CoPs formed needle-shaped hydroxylpyromorphite crystals without organics. Unexpectedly, lysine/citrate disrupted and&amp;nbsp;l-cysteine promoted such oriented aggregation, resulting in inhibited and promoted crystallinity, respectively. This study provided new mechanistic insights on LMWO effects on Ca/Pb CoP formation and their stability and can help understand Pb speciation and availability in the rhizosphere.</style></abstract><issue><style face="normal" font="default" size="100%">43</style></issue></record></records></xml>