Human-driven global nutrient imbalances increase risks to health

Penuelas, Josep; Sardans, Jordi

doi:10.1016/j.eehl.2023.08.003

Cited by 7 publications

(1 citation statement)

References 71 publications

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“…Soil nitrate nitrogen serves as a primary reservoir of vital nitrogen for the flourishing of crops [1][2][3]. Inadequate levels of soil nitrate nitrogen could have a significant detrimental effect on grain productivity, whereas excessive application of nitrogen fertilizers may result in resource inefficiency and environmental contamination [4][5][6][7]. Therefore, it is of great theoretical and practical significance to monitor the accurate content and dynamic distribution in the formation of nitrate nitrogen [8,9].…”

Section: Introductionmentioning

confidence: 99%

Multi-Sample Detection of Soil Nitrate Nitrogen Using a Digital Microfluidic Platform

Hong,

Xia,

et al. 2023

Agriculture

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The rapid quantification of nitrate nitrogen concentration plays a pivotal role in monitoring soil nutrient content. Nevertheless, the low detection efficiency limits the application of traditional methods in rapid testing. For this investigation, we utilized a digital microfluidic platform and 3D-printed microfluidics to accomplish automated detection of soil nitrate nitrogen with high sensitivity across numerous samples. The system combines digital microfluidics (DMF), 3D-printed microfluidics, a peristaltic pump, and a spectrometer. The soil solution, obtained after extraction, was dispensed onto the digital microfluidic platform using a micropipette. The digital microfluidic platform regulated the movement of droplets until they reached the injection area, where they were then aspirated into the 3D-printed microfluidic device for absorbance detection. Implementing this approach allows for the convenient sequential testing of multi-samples, thereby enhancing the efficiency of nitrate nitrogen detection. The results demonstrate that the device exhibits rapid detection (200 s for three samples), low reagent consumption (40 µL per sample), and low detection limit (95 µg/L). In addition, the relative error between the detected concentration and the concentration measured by ultraviolet spectrophotometry is kept within 20%, and the relative standard deviation (RSD) of the measured soil samples is between 0.9% and 4.7%. In the foreseeable future, this device will play a significant role in improving the efficiency of soil nutrient detection and guiding fertilization practices.

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