Towards citizen science. On-site detection of nitrite and ammonium using a smartphone and social media software

Zheng, Shulu; Li, Hangqian; Bo, Guangyong; Yuan, Dongxing; Ma, Jian

doi:10.1016/j.scitotenv.2021.152613

Cited by 31 publications

(11 citation statements)

References 34 publications

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“…These observations show that the vSEA–pH method has high reproducibility and is robust when used with different types of smartphones, making vSEA suitable for widespread promotion and use among public citizens and scientists. Nevertheless, calibration and measurements must be performed using the same smartphone in order to achieve accurate measurements, which is consistent with previously reported findings on the use of vSEA for nutrient quantification. , …”

Section: Resultssupporting

confidence: 88%

“…The vSEA–pH method exhibits the advantages of being low-cost, simple, highly precise, and potentially suitable for public citizen science and educational applications. The easy-to-operate vSEA system provides an opportunity for nonprofessionals to participate in scientific research, promoting the implementation of practical and meaningful citizen science . Future work will include (1) the investigation of more pH indicators or mixed indicator solutions to widen the methods analytical range and meet environmental monitoring requirements in different sample matrices; (2) developing paper filters impregnated with a pH indicator dye to increase the potential application range of the system and improve the convenience of indicator storage; (3) updating the WeChat-based miniprogram or constructing a new app for both Android and iOS system to show the pH map; and (4) integrating the vSEA system into the popular “GOA-ON in a Box” kit, used widely for instruction, outreach, and citizen science (GOA-ON Web site, ).…”

Section: Discussionmentioning

confidence: 99%

“…The vSEA system has previously been reported to exhibit excellent performance for nutrient quantification, with convenient operation during field-study applications. 36,37 However, the mechanism of pH measurement is fundamentally different from that of nutrients. For nutrient determination, the concentration of a single absorbent substance changes, resulting in a change in the color intensity.…”

Section: Vsea Algorithm For Ph Measurementmentioning

confidence: 99%

“…Recently, a versatile smartphone-based environmental analyzer (vSEA) algorithm and instrument were developed for the field determination of nutrient salts. , This study investigates the use of an algorithm to achieve rapid, easy, and accurate measurements of seawater pH based on a change in indicator color during pH measurements. First, the applicability of the vSEA algorithm was explored, and second, the vSEA device was applied to avoid the influence of external light conditions.…”

Section: Introductionmentioning

confidence: 99%

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Toward Citizen Science-Based Ocean Acidification Observations Using Smartphone Devices

Li,

Zheng,

Tan

et al. 2023

Anal. Chem.

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pH is a key parameter in many chemical, biological, and biogeochemical processes, making it a fundamental aspect of environmental monitoring. Rapid and accurate seawater pH measurements are essential for effective ocean observation and acidification investigations, resulting in the need for novel solutions that allow robust, precise, and affordable pH monitoring. In this study, a versatile smartphone-based environmental analyzer (vSEA) was used for the rapid measurement of seawater pH in a field study. The feasibility of the use of the vSEA algorithm for pH quantification was explored and verified. When used in conjunction with a three-dimensional (3D)-printed light-proof shell, the quality of captured images is guaranteed. The quantitative accuracy of vSEA pH measurements reached 0.018 units with an uncertainty of <0.01, meeting the requirements of the Global Ocean Acidification Observing Network (GOA-ON) for "weather" goals (permitting a maximum pH uncertainty of 0.02). The vSEA−pH system was successfully applied for on-site pH measurements in coastal seawater and coral systems. The performance of the vSEA−pH system was validated using different real-world samples, and t-test results showed that the vSEA−pH system was consistent with pH measurements obtained using a state-of-the-art benchtop spectrophotometer (t = 1.986, p = 0.7949). The vSEA−pH system is applicable to different types of smartphone devices, making it possible for vSEA−pH to be widely promoted for public citizen use. The vSEA−pH system offers a simple, accurate, and applicable method for the on-site measurement of seawater pH, assisting the large-scale monitoring of ocean acidification by allowing the contribution of citizen science-based data collection.

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Section: Resultssupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Vsea Algorithm For Ph Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toward Citizen Science-Based Ocean Acidification Observations Using Smartphone Devices

Li,

Zheng,

Tan

et al. 2023

Anal. Chem.

Self Cite

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“…WFD or SDG 6.3.2). Newly developed, easy-to-use technologies for evaluating nutrient tests (as described in Zheng et al, 2022, based on a smartphone app and digital image colorimetry) could also help to improve CS physicochemical data accuracy.…”

Section: Assessment Of Physicochemical Statusmentioning

confidence: 99%

Citizen science for assessing pesticide impacts in agricultural streams

Gönner

Bowler

Gröning

et al. 2023

Science of The Total Environment

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Ultrasensitive and On‐Site Detection of Nitroaromatic Explosives Through a Dual‐Mode Hydrogel Sensor Utilizing Portable Devices

Zhang,

Xiong,

Gao

et al. 2024

Adv Funct Materials

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The development of straightforward and dependable explosive sensors for on‐site identification is essential to preserving public safety concerns and lowering the safety risks related to explosions. However, one of the main barriers to the advancement of on‐site explosives detection in the future is the complexity of detection process. Here, a flexible hydrogel‐based sensing platform based on 3,4‐bis (4‐(1,2,2‐triphenylvinyl) phenyl) thiophene (TPE‐Z) and a methyl red design concept is shown that simultaneously achieves all targeted properties, including being quick, portable, reliable, and resistant to external interference. This composite fluorescent probe demonstrates outstanding detection capabilities, including low detection limits (0.48 mg L−1) and rapid response times (<5 s), which can be combined with smartphones for on‐site 2,4,6‐trinitrophenol (picric acid, PA) detection. Two independent fluorescence and colorimetric channels on the sensor showed selective response to PA under fluorescence and visible light irradiation, respectively. Meanwhile, the hydrogel sensor's distinct “turn on” and “turn off” response modes to PA can be utilized to construct “YES” and “NO” logic gates, which subsequently proves that they can be employed to differentiate PA on‐site. This sensing platform based on hydrogel is envisaged to offer in‐depth insights in advancing the on‐site detection of nitroaromatic explosives.

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Towards citizen science. On-site detection of nitrite and ammonium using a smartphone and social media software

Cited by 31 publications

References 34 publications

Toward Citizen Science-Based Ocean Acidification Observations Using Smartphone Devices

Toward Citizen Science-Based Ocean Acidification Observations Using Smartphone Devices

Citizen science for assessing pesticide impacts in agricultural streams

Ultrasensitive and On‐Site Detection of Nitroaromatic Explosives Through a Dual‐Mode Hydrogel Sensor Utilizing Portable Devices

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