Journal
ACS SENSORS
Volume 5, Issue 5, Pages 1381-1388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.0c00090
Keywords
portable and accurate sensor; phosphate detection; PMB method; gradient Fabry-Perot array; nutrient monitoring system
Funding
- Open Financial Grant from Qingdao National Laboratory for Marine Science and Technology [QNLM2016ORP0410]
- National Natural Science Foundation of China [11774274]
- National Key R&D Program of China [2018YFC1003200]
- Foundation Research Fund of Shenzhen Science and Technology Program [JCYJ20170818112939064]
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Here, a portable and accurate phosphate sensor using a gradient Fabry-Perot array (FPA) is proposed. It can form a bidirectional gradient concentration (absorbance) distribution in the gradient FPA, simplifying the complex operations to get a standard curve and saving time. The gradient FPA can effectively filter out the interference (bubbles, light intensity, and salinity) while improving the absorbance, achieving a highly accurate and stable detection. Besides, the smartphone simplifies data processing and makes sensors more portable. In this work, the detection errors of standard solutions (100, 50, and 30 mu M) are 0.39, 1.48, and 1.84%, respectively, and it has also been demonstrated with errors of 2.46 (sample 1, seawater), 2.08 (sample 2, lake water), and 1.83% (sample 3, sewage) for natural samples detection, which is more accurate than a traditional analyzer. The sensor has a good performance when affected by bubbles, light intensity, and salinity. In addition, the detection time is shortened to 80 s, which is more time saving compared with traditional devices, and the limit of detection (LOD) is 0.4 mu M. It can be predicted that the novel optofluidic sensor is conducive to build a smart nutrient monitoring system and will be applied in the field of biochemistry and environmental chemistry.
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