本数据来源于甘肃省环境监测中心站，数据包含网络上公开的三个观测要素，即 PH、高锰酸盐指数、氨氮。
\n数据格式为文本文件，第一栏为城市名称，第二栏为PH，第三栏为高锰酸盐指数，第四栏为氨氮，第五栏为观测日期。
\n包含固水子、牛背村、五佛寺、什川桥、新城桥、碧口6个断面的数据。
\n黄河甘肃段：新城桥（兰州上游断面）、什川桥（兰州—白银交界断面）、五佛寺（甘肃—宁夏交界断面）、牛背村（甘肃—陕西交界断面）。白龙江武都段：（固水子村断面）。
", "ds_source": "甘肃兰州新城桥水质自动监测站位于兰州市西固区，建在兰州市第一自来水厂区内。点位坐标东经103度35分02秒,北纬36度07分20秒。黄河水系（黄河干流），国控省界断面。由兰州市环境监测站托管。距离35公里。建于2001年3月。
\n\npH：表征水体酸碱性的指标，pH值为7时表示为中性，小于7为酸性，大于7为碱性。天然地表水的pH值一般为6~9之间，水体中藻类生长时由于光合作用吸收二氧化碳，会造成表层pH值升高。
\n\n高锰酸盐指数（CODMn）：以高锰酸钾为氧化剂，处理地表水样时所消耗的量，以氧的mg/L来表示。在此条件下，水中的还原性无机物（亚铁盐、硫化物等）和有机污染物均可消耗高锰酸钾，常被作为地表水受有机污染物污染程度的综合指标。也称为化学需氧量的高锰酸钾法，以别于常作为废水排放监测的重铬酸钾法的化学需氧量（COD）。
\n\n氨氮（NH3-N）：氨氮以溶解状态的分子氨（又称游离氨，NH3）和以铵盐（NH4+）形式存在于水体中，两者的比例取决于水的pH值和水温，以含N元素的量来表示氨氮的含量。水中氨氮的来源主要为生活污水和某些工业废水（如焦化和合成氨工业）以及地表径流（主要指使农田使用的肥料通过地表径流进入河流、湖库等）。
", "ds_process_way": "人工监测
", "ds_quality": "为尊重知识产权、保障数据作者的权益、扩展数据中心的服务、评估数据的应用潜力，请数据使用者在使用数据所产生的研究成果中（包括公开发表的论文、论著、数据产品和未公开发表的研究报告、数据产品等成果），明确注明数据来源和数据作者。对于转载（二次或多次发布）的数据，作者还须注明原始数据来源。
", "ds_acq_start_time": "2012-11-26 00:00:00", "ds_acq_end_time": "2013-12-01 00:00:00", "ds_acq_place": "兰州，甘肃，中国", "ds_acq_lon_east": 109.0, "ds_acq_lat_south": 32.166666666666664, "ds_acq_lon_west": 92.0, "ds_acq_lat_north": 33.35, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 83467, "ds_files_count": 2, "ds_format": "txt", "ds_space_res": null, "ds_time_res": "日", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "cf4188c3-f5ff-4944-88c9-f01c68bf95d4.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "52b7b79b-860c-49a5-9083-9a70cf8bed5a", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596 ", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.5515" ], "quality_level": 3, "publish_time": "2021-03-23 09:43:37", "last_updated": "2023-06-08 11:20:37", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.2020.1565", "i18n": { "en": { "title": "Automatic water quality station monitoring dataset for Gansu Province", "ds_format": "txt", "ds_source": "Lanzhou xinchengqiao water quality automatic monitoring station is located in Xigu District of Lanzhou City, which is built in the first tap water plant of Lanzhou city. The coordinates of the point are 103 degrees 35 minutes 02 seconds east longitude and 36 degrees 07 minutes 20 seconds north latitude. The Yellow River System (the main stream of the Yellow River) is a state-controlled provincial boundary section. It is entrusted by Lanzhou environmental monitoring station. The distance is 35 kilometers. It was built in March 2001.
\nPH: an index to characterize the acidity and alkalinity of water body. When pH value is 7, it is neutral; when it is less than 7, it is acidic; if it is greater than 7, it is alkaline. The pH value of natural surface water is generally between 6 and 9. When algae grow in the water body, the surface pH value will rise due to the absorption of carbon dioxide by photosynthesis.
\nPermanganate index (CODMn): with potassium permanganate as oxidant, the consumption of surface water samples is expressed in mg / L of oxygen. Under these conditions, potassium permanganate can be consumed by reducing inorganic substances (ferrous salts, sulfides, etc.) and organic pollutants in water, which is often used as a comprehensive indicator of the pollution degree of surface water by organic pollutants. The potassium permanganate method, also known as chemical oxygen demand, is different from the chemical oxygen demand (COD) of potassium dichromate method, which is often used as waste water discharge monitoring.
\nAmmonia nitrogen (NH3-N): ammonia nitrogen exists in water in the form of dissolved molecular ammonia (also known as free ammonia, NH3) and ammonium salt (NH4 +). The ratio of the two depends on the pH value and water temperature of the water. The content of ammonia nitrogen is expressed by the amount of n element. The main sources of ammonia nitrogen in water are domestic sewage and some industrial wastewater (such as coking and synthetic ammonia industry) and surface runoff (mainly refers to the fertilizer used in farmland entering rivers, lakes and reservoirs through surface runoff).
", "ds_quality": "In order to respect intellectual property rights, protect the rights and interests of data authors, expand the services of the data center, and evaluate the application potential of data, data users are requested to clearly indicate the data source and data author in the research results (including published papers, monographs, data products and unpublished research reports and data products) generated by the use of data. For the reprinted data (published twice or more), the author should also indicate the source of the original data.
", "ds_ref_way": "", "ds_abstract": "The data comes from Gansu environmental monitoring center station, which contains three observation elements, namely pH, permanganate index and ammonia nitrogen.
\nThe data format is text file, the first column is city name, the second column is pH, the third column is permanganate index, the fourth column is ammonia nitrogen, and the fifth column is observation date.
\nIt includes the data of 6 sections of gushuizi, Niubei village, Wufosi, Shichuan bridge, Xincheng bridge and Bikou.
\nGansu section of the Yellow River: Xincheng bridge (Lanzhou upstream section), Shichuan bridge (Lanzhou Baiyin junction section), Wufosi (Gansu Ningxia junction section), Niubei Village (Gansu Shaanxi junction section). Wudu section of Bailong River: (section of gushuizi Village).
", "ds_time_res": "日", "ds_acq_place": "Lanzhou, Gansu, China", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Manual monitoring
", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "ds_topic_tags": [ "高锰酸盐指数", "水质", "氨氮", "PH" ], "ds_subject_tags": [ "水文化学" ], "ds_class_tags": [], "ds_locus_tags": [ "甘肃省", "新城桥", "五佛寺", "碧口", "兰州", "什川桥", "牛背村", "固水子" ], "ds_time_tags": [ 2012, 2013 ], "ds_contributors": [ { "true_name": "王亮绪", "email": "", "work_for": "甘肃省环境监测中心站", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "王亮绪", "email": "", "work_for": "甘肃省环境监测中心站", "country": "中国" } ], "ds_managers": [ { "true_name": "王亮绪", "email": "", "work_for": "甘肃省环境监测中心站", "country": "中国" } ], "category": "水文" }