發佈日期 2026-09-04
Hach NT3100sc UV 硝酸鹽感測器協助美國農業流域管理單位之營養鹽監測
Leveraging the Hach NT3100sc UV Nitrate Sensor for Data-Driven Nutrient Management
Continuous Nitrate Monitoring in Agricultural Watersheds
Source : Hach US
由於農業流域中的硝酸鹽濃度容易受到降雨、地表逕流、地下排水及施肥活動影響而產生快速變化，傳統人工採樣難以掌握污染高峰與實際營養鹽負荷。Hach 新一代 NT3100sc UV Nitrate Sensor 透過無試劑、連續線上監測技術，即時精確量測河川與天然水體中的硝酸鹽濃度變化，提供高解析度數據，協助建立更準確的營養鹽負荷模型與污染趨勢分析。
NT3100sc UV 硝酸鹽感測器 成功應用於美國愛荷華州水質資訊系統 (IWQIS)、明尼蘇達州水質資訊系統 (IWQIS) 及 田納西州 (United States Geological Survey美國地質調查局)等大型流域監測計畫，長期部署於河川與集水區，並可另外結合流量、水位、導電度、溶氧及溫度等水文參數感測器進行綜合分析。實際監測結果顯示，Hach NT3100sc UV 硝酸鹽感測器能有效捕捉暴雨及農業逕流造成的短期硝酸鹽濃度變化，協助使用者了解營養鹽的來源、轉移及分布情形。
Hach NT3100sc UV 硝酸鹽感測器採用雙波長UV量測技術、內建自動刮刷清潔系統及低濃度量測能力，可降低濁度與懸浮固體干擾，適合長期戶外監測應用。透過持續且可靠的監測數據，流域管理單位得以更精準評估減污措施成效、強化水源保護策略，並為營養鹽管理與環境永續提供科學決策的依據。
Hach SC4500 Digital Controller and NT3100sc UV Nitrate sensor (5mm path length configuration)
Agricultural watersheds are a dominant source of nitrate loading to rivers, reservoirs, and downstream drinking water supplies.
Because nitrate transport is highly dynamic and event driven, traditional grab sampling often fails to capture peak loading conditions and short-duration runoff events.
The Hach NT3100sc UV Nitrate Sensor provides continuous, reagent-free nitrate monitoring, enabling high-resolution measurement of nitrate concentrations in streams, rivers, and edge-of-field applications. When combined with other hydrological data via connectivity provided by the SC4500 digital controller, the NT3100sc supports accurate nutrient load calculations, real-time event detection, and defensible watershed management decisions.
NT3100sc User Experience Spotlight 使用者體驗亮點
Iowa Water Quality Information System (IWQIS) 愛荷華州水質資訊系統 (IWQIS)
The IWQIS program seasonally deploys a fleet of several dozen Hach nitrate sensors into natural waterways across the state, alongside sensors operated by the U.S. Department of Agriculture and the U.S. Geological Survey. The resulting deployment coverage represents one of the largest water quality sensor network in the country. *5
The IWQIS program seasonally deploys a fleet of several dozen Hach nitrate sensors into natural waterways across the state, alongside sensors operated by the U.S. Department of Agriculture and the U.S. Geological Survey. The resulting deployment coverage represents one of the largest water quality sensor network in the country. *5
This information is aggregated with other hydrologic parameters including pH, dissolved oxygen concentration, discharge rates and temperature. Data are incorporated into models maintained by the University of Iowa’s IIHR—Hydroscience and Engineering and the Center for Health Effects of Environmental Contamination. These models support evaluation of nutrient reduction strategies under Iowa’s Nutrient Reduction Strategy framework. *6
The data collected by nitrate sensors are also made available in real-time on a public website to help researchers, agencies, and landowners directly monitor the impact of land-use strategies/changes on downstream water quality. This enables watershed stakeholders to understand the fate and transport of nutrients in the state’s waterways. *7
Minnesota Pollution Control Agency (MPCA) 明尼蘇達州污染控制署 (MPCA)
The Minnesota Pollution Control Agency has installed a network of Hach nitrate sensors in areas of the state where elevated nitrate concentrations and nutrient loading have historically been observed. Sensors are typically deployed between February and November each year. Water quality data collected through the Continuous Nitrate Sensor Network is publicly available through collaborative efforts among state and federal agencies, providing stakeholders with a valuable tool to identify, monitor, and manage sources of elevated nutrient loading in surface waters.
The Minnesota Pollution Control Agency has installed a network of Hach nitrate sensors in areas of the state where elevated nitrate concentrations and nutrient loading have historically been observed. Sensors are typically deployed between February and November each year. Water quality data collected through the Continuous Nitrate Sensor Network is publicly available through collaborative efforts among state and federal agencies, providing stakeholders with a valuable tool to identify, monitor, and manage sources of elevated nutrient loading in surface waters.
明尼蘇達州污染控制署已在該州在歷史紀錄中硝酸鹽濃度和營養物負荷較高的地區安裝了Hach 硝酸鹽感測系統。感測器通常在每年2月至11月期間部署。經由州和聯邦機構的合作，連續硝酸鹽感測器網路收集的水質數據是向公眾開放，作為一個重要的資訊工具，讓有關人員得以辨識、監測和管理地面水中營養物負荷過高的來源。
MPCA staff utilize custom-fabricated mounting systems to deploy and immerse sensors into surface water while allowing for seasonal depth adjustments as water levels change throughout the year. In addition to the NT3100sc sensor’s integrated automated wiper system for debris removal, operators routinely perform maintenance, cleaning, and calibration checks on the nitrate sensor. Cleaning solutions include water, diluted vinegar solution, and diluted acid solutions as part of regular field servicing procedures. Calibration checks are performed using factory standards, and the freshly maintained sensor is verified against a portable field meter in the river to confirm proper operation and accuracy.
MPCA 工作人員使用客製化的安裝系統將感測器部署並浸入地表水中，同時允許根據全年水位變化進行季節性深度調整。除了 NT3100sc 感測器用於清除雜物的自動刮水系統外，操作人員還會定期對硝酸鹽感測器進行維護、清潔和校正檢查。作為常規現場維護程序的一部分，清潔溶液包括水、稀釋的醋溶液和稀釋的酸溶液。校正檢查按照出廠標準進行，並將維護後的感測器與攜帶式現場儀表進行驗證，以確認其運作正常且準確。
Tennessee (United States Geological Survey) 田納西州(美國地質調查局 USGS）
The USGS monitors nitrate in two locations along the Harpeth River in Tennessee. The river flows through the Franklin metropolitan area before meeting the Cumberland River which provides drinking water to over 2 million people in the Nashville metropolitan area.
The USGS monitors nitrate in two locations along the Harpeth River in Tennessee. The river flows through the Franklin metropolitan area before meeting the Cumberland River which provides drinking water to over 2 million people in the Nashville metropolitan area.
美國地質調查局在田納西州哈珀斯河沿岸的兩個地點監測硝酸鹽。哈珀斯河流經富蘭克林都會區，最終匯入坎伯蘭河，後者為納許維爾都會區超過200萬人提供飲用水。
The Harpeth River is used primarily as a recreational area for boating and fishing; the presence of agricultural land within the river’s watershed drives stakeholder interest in nutrient monitoring.*9
哈珀斯河主要用作划船和釣魚的休閒場所；流域內農業用地的存在促使利益相關者關注營養物質監測。
The NT3100sc sensors are mounted horizontally from the riverbank, and staff adjust the positioning to ensure even mixing through the deepest portion of the river channel. Nitrate is monitored along with dissolved oxygen, conductivity and temperature.
NT3100sc感測器以水平方式安裝在河岸上，工作人員會調整其位置，以確保河道最深處的水體能夠均勻混合。除了硝酸鹽濃度，同時另外監測的指標包括、溶氧、導電度和溫度。
Nitrate concentration (as NO3+NO2) rises immediately and proportionally following each spike in the river’s gage height and trends with changes in conductivity and river flow. While measured nitrate concentration and conductivity levels shift with changes in river stage they do not trend together.
硝酸鹽濃度（NO3+NO2）會隨著河水水位的每次峰值而立即成比例上升，並隨電導率和河川流量的變化而變化。雖然測得的硝酸鹽濃度和導電度濃度會隨著河流水位的變化而變化，但它們的變化趨勢並不一致。
Complete article content and references is available here :
NT3100 Environmental White PaperDOC183.53.30891
White Papers (2.17 MB) Apr26