[快闪报告]The Overlooked Role of Manganese Driving Phosphorus Mobilization in Sediment

The Overlooked Role of Manganese Driving Phosphorus Mobilization in Sediment
编号:452 稿件编号:3356 访问权限:私有 更新:2023-04-20 22:30:10 浏览:295次 快闪报告

报告开始:2023年05月07日 10:39 (Asia/Shanghai)

报告时间:5min

所在会议:[4A] 4A、生态与可持续发展 » [4A-2] 4A-2 生态与可持续发展

演示文件

提示:该报告下的文件权限为私有,您尚未登录,暂时无法查看。

摘要
Iron (Fe) is identified to play a crucial role in driving phosphorus (P) mobilization in sediment. However, the role of manganese (Mn) on P mobilization is poorly understood. Herein, P mobilization mechanism influenced by Mn was investigated both in filed investigation and incubation experiment. In field investigation, significant positive correlations (r2>0.63, p<0.01) and synchronize distributions between DGT-P(Ⅴ) and DGT-Mn(Ⅱ) in sediment profile suggest that P cycle is couple with Mn cycle. This finding is further confirmed by similar results of DGT-P(Ⅴ) and DGT-Mn(Ⅱ) in sediment profile from incubation experiments. Concentration of DGT-Fe(Ⅱ) is low (mean<0.18 mg L-1) in top 6 cm sediment and high (mean>0.36 mg L-1) in the depth of -6 to -9.4 cm sediment while DGT-S(-Ⅱ) have opposite concentration pattern, indicating that reduced Fe(Ⅱ) in top 6 cm sediment were co-deposited with S(-Ⅱ). The possible mechanism of Mn affected P mobilization in sediments, evidenced from X-ray photoelectron spectroscopy (XPS) and Mn XANES spectra results, is P was mainly trapped by Mn(Ⅲ) to form P-bearing Mn oxides then coated on sediment nodule surface under aerobic conditions, and those P-bearing Mn oxides were preferentially reduced under hypoxic environment led P cycle couple with Mn cycle. Fe XANES spectra and 57Fe Mössbauer spectra demonstrated that goethite and pyrite are the dominate Fe phases (range from 60 to 95%) in sediments, this leads weak influence of Fe on P cycle. Overall, this work indicate that Mn(Ⅲ) oxides strongly influence fate and cycle of P, and provides new insights into the coupled cycles of Mn and P in reducing sediments.
关键字
Phosphorus mobilization, Manganese, Iron, Eutrophication, Freshwater sediments.
报告人
陈权
中国科学院地球化学研究所

稿件作者
陈权 中国科学院地球化学研究所
王敬富 中国科学院地球化学研究所
发表评论
验证码 看不清楚,更换一张
全部评论

联系我们

会务总协调、疫情防控:

沈焕锋(13163235536;shenhf@whu.edu.cn)

管小彬(18007973663;guanxb@whu.edu.cn)

魏秀琴(15871750333;weixiuqin@whu.edu.cn)

会场安排:

沈焕锋(13163235536;shenhf@whu.edu.cn)

李长冬(15327198910;lichangdong2008@126.com)

张 亮(15827200707;lzhang@whigg.ac.cn)

徐 鹏(13554674258;xupengwhu@whu.edu.cn)

学术安排:

王伦澈(13349889828;wang@cug.edu.cn)

庄艳华(13349889826;zhuang@apm.ac.cn)

李星华(15527964369;lixinghua5540@whu.edu.cn)

会议注册:

管小彬(18007973663;guanxb@whu.edu.cn)

赵 林(18071070948;linzhao@whu.edu.cn)

会议财务:

张传喜(13627137374;zhangchuanxi@whu.edu.cn)

石玉婷(13476286537;yutingshi@vip.qq.com)

商业赞助:

阮志敏(15871826028;ruanzm@whu.edu.cn)

黄文丽(13693626212;wenli.huang@whu.edu.cn)

会议服务,酒店预定,网站、注册系统服务:

曹雪峰(18971567453;carol@chytey.com)

金钰壹(18271358859;jinyuyi@whu.edu.cn)

会务总协调、疫情防控:
沈焕锋(13163235536;shenhf@whu.edu.cn)
管小彬(18007973663;guanxb@whu.edu.cn)
魏秀琴(15871750333;weixiuqin@whu.edu.cn)
会场安排:
沈焕锋(13163235536;shenhf@whu.edu.cn)
李长冬(15327198910;lichangdong2008@126.com)
张 亮(15827200707;lzhang@whigg.ac.cn)
徐 鹏(13554674258;xupengwhu@whu.edu.cn)
学术安排:
王伦澈(13349889828;wang@cug.edu.cn)
庄艳华(13349889826;zhuang@apm.ac.cn)
李星华(15527964369;lixinghua5540@whu.edu.cn)
会议注册:
管小彬(18007973663;guanxb@whu.edu.cn)
赵 林(18071070948;linzhao@whu.edu.cn)
会议财务:
张传喜(13627137374;zhangchuanxi@whu.edu.cn)
石玉婷(13476286537;yutingshi@vip.qq.com)
商业赞助:
阮志敏(15871826028;ruanzm@whu.edu.cn)
黄文丽(13693626212;wenli.huang@whu.edu.cn)
会议服务,酒店预定,网站、注册系统服务:
曹雪峰(18971567453;carol@chytey.com)
金钰壹(18271358859;jinyuyi@whu.edu.cn)
注册缴费 提交稿件