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Technical Note: Field experiences using UV/VIS sensors for high-resolution monitoring of nitrate in groundwater

机译：技术说明：使用UV / VIS传感器进行地下水硝酸盐高分辨率监测的现场经验

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摘要

Two different in situ spectrophotometers are compared that were used in thefield to determine nitrate-nitrogen (NO3-N) concentrations attwo distinct spring discharge sites. One sensor was a double wavelengthspectrophotometer (DWS) and the other a multiple wavelengthspectrophotometer (MWS). The objective of the study was to review thehardware options, determine ease of calibration, accuracy, influence ofadditional substances and to assess positive and negative aspects of the twosensors as well as troubleshooting and trade-offs. Both sensors aresufficient to monitor highly time-resolved NO3-N concentrationsin emergent groundwater. However, the chosen path length of the sensors hada significant influence on the sensitivity and the range of detectableNO3-N. The accuracy of the calculated NO3-N concentrationsof the sensors can be affected if the content of additional substances suchas turbidity, organic matter, nitrite or hydrogen carbonate significantlyvaries after the sensors have been calibrated to a particular water matrix.The MWS offers more possibilities for calibration and error detection butrequires more expertise compared with the DWS.
机译：比较了两种不同的原位分光光度计，该分光光度计在现场用于确定两个不同的弹簧放电部位的硝酸盐氮（NO 3 -N）浓度。一个传感器是双波长分光光度计（DWS），另一个是多波长分光光度计（MWS）。这项研究的目的是审查硬件选项，确定校准的难易程度，准确性，其他物质的影响并评估两个传感器的正反两方面以及故障排除和权衡。两种传感器都足以监测地下水中高分辨的NO 3 -N浓度。然而，传感器的选择路径长度对NO 3 -N的灵敏度和可探测范围有很大影响。如果将传感器校准至特定的水基质后，浊度，有机物，亚硝酸盐或碳酸氢盐等其他物质的含量发生显着变化，则可能会影响传感器计算的NO 3 -N浓度的准确性。与DWS相比，MWS提供了更多的校准和错误检测可能性，但需要更多的专业知识。

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