典型城市河流硝态氮污染来源的氮氧同位素解析

国秋艳; 张秋英; 舒旺; 柏杨巍; 李兆; 卫毅梅; 刘丹妮

doi:10.12153/j.issn.1674-991X.20221288

典型城市河流硝态氮污染来源的氮氧同位素解析

doi: 10.12153/j.issn.1674-991X.20221288

国秋艳^{1, 2,},
张秋英^1, ,,
舒旺³,
柏杨巍¹,
李兆³,
卫毅梅¹,
刘丹妮¹

1.
中国环境科学研究院
2.
武汉工程大学化学与环境工程学院
3.
中国科学院地理科学与资源研究所

基金项目: 国家自然科学基金项目（41271047）

详细信息

作者简介:
国秋艳（1998—），女，硕士研究生，主要从事流域环境污染源解析研究，15030805843@163.com

通讯作者:
张秋英(1972—)，女，副研究员，主要从事流域环境污染源解析与控制研究，zhangqy@craes.org.cn

中图分类号: X522
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出版历程
- 收稿日期: 2022-12-29

Nitrogen and oxygen isotope analysis of nitrate-nitrogen pollution sources in a typical urban river

GUO Qiuyan^{1, 2
,},
ZHANG Qiuying^{1
, ,},
SHU Wang³,
BAI Yangwei¹,
LI Zhao³,
WEI Yimei¹,
LIU Danni¹

1.
Chinese Research Academy of Environmental Sciences
2.
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology
3.
Institute of Geographic Sciences and Nature Resource Research, Chinese Academy of Sciences

摘要

摘要:
城市河流硝态氮（NO₃-N）污染已经成为快速城市化发展中备受关注的水环境问题。以西安市皂河为例，于2021年的5月（旱季）和9月（雨季）采集其河流水体、排口出水和污水处理厂进出水，测定水质参数，并利用氮氧稳定同位素和Iso Source模型解析NO₃-N来源。结果表明：5月和9月皂河NO₃-N的δ¹⁵N分别为−26.43‰~32.29‰和−2.81‰~20.85‰，δ¹⁸O分别为−23.42‰~53.02‰和−5.26‰~21.53‰；粪污是皂河NO₃-N的主要来源，皂河不同污染源NO₃-N来源的平均贡献率，河流水体为粪污>土壤中氮>化肥>大气沉降，排口出水为粪污>土壤中氮>化肥>大气沉降，污水处理厂进水为大气沉降>粪污>土壤中氮>化肥，污水处理厂出水为粪污>土壤中氮>化肥>大气沉降；土壤中氮和粪污合计对皂河流域NO₃-N的贡献率大于70%。控制居民生活污水排放、加强管网建设、强化畜禽粪污管理以及加强土地施肥监督等，有利于减轻城市河流NO₃-N污染。
- 城市河流 /
- 硝态氮(NO₃-N) /
- 水化学 /
- 氮氧同位素 /
- Iso Source模型
Abstract:
Nitrate-nitrogen (NO₃-N) pollution in urban rivers has become a water environment problem of great concern in the context of rapid urbanization. Taking the Zaohe River in Xi'an City as an example, the river water body, discharge wastewater and inlet and outlet water of wastewater treatment plants were sampled in May (dry season) and September (rainy season) in 2021 to determine the water quality parameters and to resolve their nitrate-nitrogen sources using nitrogen and oxygen stable isotope and Iso Source models. The results showed that δ¹⁵N values of nitrate-nitrogen in the Zaohe River ranged from −26.43‰ to 32.29‰ and −2.81‰ to 20.85‰ in May and September, respectively, and δ¹⁸O values ranged from −23.42‰ to 53.02‰ and −5.26‰ to 21.53‰, respectively. Manure was the main source of nitrate pollution in the Zaohe River, and the average contribution rate of different nitrate sources in the river was in the order as follows: for river water, manure > soil organic nitrogen > fertilizer > atmospheric deposition; for discharge water, manure > soil organic nitrogen > fertilizer > atmospheric deposition; for sewage treatment plant influent water, atmospheric deposition > manure > soil organic nitrogen > fertilizer; for sewage treatment plant effluent, manure > soil organic nitrogen > fertilizer > atmospheric deposition. The combined contribution of soil organic nitrogen and manure to the Zaohe River watershed was greater than 70%. Therefore, controlling the discharge of residential sewage, strengthening the construction of pipeline networks, enhancing the management of livestock and poultry manure and strengthening the supervision of land fertilization were conducive to reducing the pollution of nitrate-nitrogen in urban rivers.
- urban rivers /
- nitrate-nitrogen /
- water chemistry /
- nitrogen and oxygen isotopes /
- Iso Source model

HTML全文

图 1 皂河采样点位分布

Figure 1. Distribution of sampling points in Zaohe River

下载: 全尺寸图片幻灯片

图 2 皂河不同类型采样点TN、NH₃-N和NO₃-N浓度分布

Figure 2. Distribution of TN, NH₃-N and NO₃-N concentrations at different types of sampling sites in Zaohe River

下载: 全尺寸图片幻灯片

图 3 皂河不同类型采样点氮氧同位素组成

Figure 3. Nitrogen and oxygen isotopic composition of different types of sampling sites in Zaohe River

下载: 全尺寸图片幻灯片

图 4 皂河水体NO₃-N的氮氧稳定同位素来源解析

Figure 4. Source analysis of nitrogen and oxygen stable isotopes of NO₃-N in Zaohe River water

下载: 全尺寸图片幻灯片

图 5 皂河不同类型采样点NO₃-N来源贡献率

Figure 5. Contribution rate of NO₃-N sources at different types of sampling sites in Zaohe River

下载: 全尺寸图片幻灯片

表 1 NO₃-N不同污染源来源的氮氧同位素特征范围

Table 1. Range of nitrogen and oxygen isotope characteristics of different sources of nitrate-nitrogen pollution ‰　

氮来源	δ¹⁵N-NO₃ ⁻	δ¹⁸O-NO₃ ⁻
大气沉降氮^[25]	−13~13	25~75
土壤中氮^[26]	0~8	−10~10
铵态氮肥^[27]	−7.5~4	−5~15
硝态氮肥^[28-29]	−6~6	17~25
粪污^[30]	6~25	−5~15

下载: 导出CSV

表 2 皂河不同类型采样点NO₃-N来源贡献率分布

Table 2. Distribution of NO₃-N source contribution at different types of sampling sites in Zaohe River %　

采样时间	氮来源		河流水体	排口出水	污水处理厂
采样时间	氮来源		河流水体	排口出水	进水	出水
旱季	大气沉降	平均值	1.67	16.00	52.86	0.67
	大气沉降	标准差	1.83	30.51	13.51	0.75
	化肥	平均值	7.89	5.40	19.14	5.00
	化肥	标准差	6.59	3.01	18.57	3.92
	土壤中氮	平均值	25.89	25.00	24.00	49.00
	土壤中氮	标准差	10.98	15.53	11.34	17.24
	粪污	平均值	64.56	53.60	4.00	45.33
	粪污	标准差	13.64	24.32	6.70	20.99
雨季	大气沉降	平均值	1.00	1.83	9.00	0.71
	大气沉降	标准差	1.32	1.57	13.87	1.03
	化肥	平均值	18.06	11.50	5.00	7.71
	化肥	标准差	6.42	2.57	1.22	3.33
	土壤中氮	平均值	38.00	37.83	22.75	37.00
	土壤中氮	标准差	14.44	17.05	11.14	21.71
	粪污	平均值	42.94	48.83	63.25	54.57
	粪污	标准差	10.33	17.23	11.90	23.39

下载: 导出CSV

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