Phosphorus speciation in coastal sediment of Osaka Bay: Relation to anthropogenic phosphorus loading

Muhammad Shahinur Shahinur Rahman, S. Onodera, Mitsuyo Saito, Takuya Ishida, Kunyang Wang, Takahiro Hosono, Yu Umezawa
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Abstract

This study assessed the effect of increased anthropogenic phosphorus (P) loading on P speciation in coastal sediments in Osaka Bay, an urbanized enclosed bay, and one of Japan's most industrialized regions. The study analyzed Total P (TP) and determined the accumulations of five different P species Exchangeable P (Ex-P), Iron-bound P (Fe-P), Calcium-bound P (Ca-P), Detrital P (Det-P) and Organic P (Org-P)in the sediment using the sequential extraction method. We also estimated the historical P loading into Osaka Bay from major river catchments (the Yodo and Yamato Rivers) using the Soil and Water Assessment Tool. This study identified peak P loading values for the Yodo River in 1965 and the Yamato River in 1968, with the Yodo River being the primary anthropogenic source of P inflow for Osaka Bay. The concentration of TP ranges from 290.5 to 353.1 mg/Kg respectively, and the order of concentrations of the different P species is Org-P > Det-P > Ca-P > Fe-P > Ex-P. The results indicate a positive relationship between total P loading and Ca-P during the rapid growth period. We examined two potential mechanisms (adsorption-precipitation process and sink switching) for Ca-P formation and hypothesized that the adsorption-precipitation process is the dominant process, indicating that high anthropogenic P loading causes the accumulation of immobile Ca-P species in coastal sediments and serves as a permanent sink for P, as well as for water quality restoration. This result also suggests the possibility of reconstructing historical human-induced P loadings based on Ca-P in coastal sediments.
大阪湾沿岸沉积物中磷的种类:与人为磷负荷的关系
大阪湾是一个城市化的封闭海湾,也是日本工业化程度最高的地区之一,这项研究评估了人为磷(P)负荷增加对大阪湾沿岸沉积物中磷的种类的影响。该研究分析了总磷(TP),并采用顺序提取法测定了沉积物中五种不同磷物种的累积量:可交换磷(Ex-P)、铁结合磷(Fe-P)、钙结合磷(Ca-P)、碎屑磷(Det-P)和有机磷(Org-P)。我们还使用土壤和水评估工具估算了主要河流流域(淀川和大和川)历史上排入大阪湾的 P 负荷。这项研究确定了 1965 年淀川和 1968 年大和川的 P 负荷峰值,淀川是大阪湾 P 流入的主要人为来源。总磷酸盐的浓度范围分别为 290.5 至 353.1 毫克/千克,不同磷酸盐种类的浓度顺序为 Org-P > Det-P > Ca-P > Fe-P > Ex-P。结果表明,在快速生长期,总磷负荷与 Ca-P 之间呈正相关。我们研究了 Ca-P 形成的两种潜在机制(吸附-沉淀过程和水槽转换),推测吸附-沉淀过 程是最主要的过程。这一结果也为根据沿岸沉积物中的 Ca-P 重建历史上人为 P 负荷提供了可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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