Study of sedimentary organic carbon using δ13C, δ15N and TOC/TN as indicator in sediment core samples from Mumbai Harbor Bay

IF 2.9 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Monitoring and Assessment Pub Date : 2025-04-15 DOI:10.1007/s10661-025-13980-0

V. B. Yadav, Vandana A. Pulhani, A. Vinod Kumar

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Abstract

Elemental [Total Organic Carbon (TOC) and Total Nitrogen (TN)] compositions and stable isotope ratio of carbon (δ¹³C), and nitrogen (δ¹⁵N) compositions were measured in four sediment core samples from Mumbai Harbour Bay (MHB), Mumbai, India, to assess the impact of anthropogenic discharges on organic matter in the area and to identify the contribution of terrestrial and marine sources to sedimentary organic carbon. The average values for TOC (%), TN (%) and TOC/TN ratio at different sampling locations in the study area ranges from 1.86% to 2.29%, 0.16% to 0.22%, and 10.49 to 12.01, respectively. Similarly, the average values for δ¹³C and δ¹⁵N were found to vary from - 23.53‰ to - 21.12‰ and from 1.22‰ to 3.14‰, respectively. The sediment from regions impacted by anthropogenic activities had a higher terrestrial organic matter. Application of a two end-member mixing model indicated the contribution of marine sources to organic matter increased from 53.40 ± 11.24% at the northern end to 90.51 ± 6.91% at the southern end of the bay. The correlation between the measured parameters indicates that the organic matter in the region has undergone significant diagenesis and bacterial decomposition. Overall, this study highlights the importance of stable isotope ratios in understanding the complex dynamics of marine ecosystems and the source of organic matter.

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以δ13C、δ15N和TOC/TN为指标研究孟买港湾沉积物岩心中沉积有机碳

通过测定印度孟买港湾（MHB） 4个沉积物岩心样品的元素[总有机碳（TOC）和总氮（TN）]组成以及碳（δ13C）和氮（δ15N）组成的稳定同位素比值，评估了人为排放对该地区有机质的影响，并确定了陆源和海源对沉积有机碳的贡献。研究区不同采样点TOC（%）、TN（%）和TOC/TN比值的平均值分别为1.86% ~ 2.29%、0.16% ~ 0.22%和10.49 ~ 12.01。δ13C和δ15N的平均值分别在- 23.53‰~ - 21.12‰和1.22‰~ 3.14‰之间变化。受人类活动影响地区的沉积物陆源有机质含量较高。两端元混合模型表明，海源对海湾有机质的贡献从北端的53.40±11.24%增加到南端的90.51±6.91%。测量参数的相关性表明，该区有机质经历了明显的成岩作用和细菌分解作用。总的来说，本研究强调了稳定同位素比率在理解海洋生态系统的复杂动态和有机物来源方面的重要性。

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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来源期刊

Environmental Monitoring and Assessment 环境科学-环境科学

CiteScore

4.70

自引率

6.70%

发文量

1000

审稿时长

7.3 months

期刊介绍： Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.