Quantification of spatial and seasonal variations in the proportional contribution of nitrate sources using a multi-isotope approach and Bayesian isotope mixing model

硝酸盐 环境科学 分水岭 空间变异性 稳定同位素比值 同位素分析 环境化学 水文学(农业) 土壤科学 化学 生态学 地质学 统计 量子力学 生物 计算机科学 机器学习 物理 数学 有机化学 岩土工程
作者
Aminreza Meghdadi,Narmin Javar
出处
期刊:Environmental Pollution [Elsevier]
卷期号:235: 207-222 被引量:128
标识
DOI:10.1016/j.envpol.2017.12.078
摘要

Spatial and seasonal variations in nitrate contamination are a globally concern. While numerous studies have used δ15N-NO3 and δ18O-NO3 to elucidate the dominant sources of nitrate in groundwater, this approach has significant limitations due to the overlap of nitrate isotopic ranges and the occurrence of nitrate isotopic fractionation. This study quantitatively assessed the spatial and seasonal variations in the proportional contributions of nitrate sources from different land uses in the Tarom watershed in North-West Iran. To achieve this aim, orthogonal projection of the hydrochemical and isotopic dataset of the principal component analysis (PCA) as well as correlation coefficient matrix (Corr-PCA) were evaluated to reduce the dimensionality of the inter-correlated dataset. Next, a nitrate isotopic biplot accompanied with a Bayesian isotope mixing model (SIAR) were applied to specify the spatial and seasonal trends in the proportional contribution of three dominant sources of nitrate (fertilizers, animal manure and residential waste) in the watershed. Finally, in order to provide a sensitive framework for nitrate source appointment and overcome the associated limitations of dual nitrate isotope application, the integration of boron isotope (δ11B) and strontium isotopic ratio (87Sr/86Sr) was introduced. The results revealed that the mean contribution of residential sewage increased (17%–27.5%), while the mean contribution of fertilizers decreased (28.3%–19%), from late spring to early autumn. Also, fertilizer was the highest contributor (42.1% ± 3.2) during late spring, especially in regions with more than 75% agricultural land. Meanwhile, the mean contribution of sewage was highest in early autumn (32.1% ± 2.8) in the areas with more than 20% residential land. These results were confirmed by coupled application of δ11B and 87Sr/86Sr. This study provides a useful insight for environmental managers to verify groundwater pollution contributors and to better apply remedial solutions.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
金阿垚在科研应助小小智采纳,获得10
刚刚
SX0000完成签到 ,获得积分10
1秒前
王汐完成签到,获得积分10
1秒前
GSQ完成签到,获得积分10
3秒前
mikebai完成签到,获得积分10
4秒前
医生小白完成签到 ,获得积分10
4秒前
常葶完成签到,获得积分10
6秒前
方半仙完成签到,获得积分10
11秒前
顾矜应助常葶采纳,获得10
11秒前
Dawn完成签到 ,获得积分10
13秒前
13秒前
mojomars完成签到,获得积分10
16秒前
柠萌完成签到 ,获得积分10
16秒前
Fei发布了新的文献求助30
20秒前
精明秋完成签到,获得积分10
22秒前
Qiancheni完成签到,获得积分10
23秒前
流沙无言完成签到 ,获得积分10
23秒前
小小智完成签到,获得积分10
25秒前
七七完成签到 ,获得积分10
25秒前
Minjalee完成签到,获得积分10
27秒前
xyzlancet完成签到,获得积分10
27秒前
Ida完成签到 ,获得积分10
31秒前
Tonald Yang完成签到,获得积分10
33秒前
Beyond095完成签到,获得积分10
36秒前
苦行僧完成签到 ,获得积分10
38秒前
自信放光芒~完成签到 ,获得积分10
38秒前
轩仔完成签到 ,获得积分10
38秒前
鱼儿忆流年完成签到 ,获得积分10
39秒前
认真的焦完成签到 ,获得积分10
42秒前
44秒前
44秒前
daisy完成签到 ,获得积分10
47秒前
菜芽君完成签到,获得积分10
47秒前
丽莉发布了新的文献求助10
49秒前
Fei发布了新的文献求助30
51秒前
我是老大应助丽莉采纳,获得10
56秒前
行走在科研的小路上完成签到,获得积分10
57秒前
浩浩完成签到 ,获得积分10
57秒前
人类繁殖学完成签到 ,获得积分10
57秒前
59秒前
高分求助中
Sustainability in Tides Chemistry 2000
Microlepidoptera Palaearctica, Volumes 1 and 3 - 13 (12-Volume Set) [German] 1122
Дружба 友好报 (1957-1958) 1000
The Data Economy: Tools and Applications 1000
Regression-Based Normative Data for Psychological Assessment 700
Mantiden - Faszinierende Lauerjäger – Buch gebraucht kaufen 700
PraxisRatgeber Mantiden., faszinierende Lauerjäger. – Buch gebraucht kaufe 700
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3099819
求助须知:如何正确求助?哪些是违规求助? 2751281
关于积分的说明 7612331
捐赠科研通 2403098
什么是DOI,文献DOI怎么找? 1275171
科研通“疑难数据库(出版商)”最低求助积分说明 616276
版权声明 599053