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Cited by 400

The DOI matches its Crossref record; 38 of the 38 references it cites were found in a registry or an index.

Detection and Spatial Mapping of Mercury Contamination in Water Samples Using a Smart-Phone

Open access
Wei, Qingshan, Nagi, Richie, Sadeghi, Kayvon, Feng, Steve, Yan, Eddie, Ki, So Jung, Caire, Romain, Tseng, Derek, Ozcan, Aydogan·2014·ACS Nano

Abstract

Detection of environmental contamination such as trace-level toxic heavy metal ions mostly relies on bulky and costly analytical instruments. However, a considerable global need exists for portable, rapid, specific, sensitive, and cost-effective detection techniques that can be used in resource-limited and field settings. Here we introduce a smart-phone-based hand-held platform that allows the quantification of mercury(II) ions in water samples with parts per billion (ppb) level of sensitivity. For this task, we created an integrated opto-mechanical attachment to the built-in camera module of a smart-phone to digitally quantify mercury concentration using a plasmonic gold nanoparticle (Au NP) and aptamer based colorimetric transmission assay that is implemented in disposable test tubes. With this smart-phone attachment that weighs <40 g, we quantified mercury(II) ion concentration in water samples by using a two-color ratiometric method employing light-emitting diodes (LEDs) at 523 and 625 nm, where a custom-developed smart application was utilized to process each acquired transmission image on the same phone to achieve a limit of detection of ∼ 3.5 ppb. Using this smart-phone-based detection platform, we generated a mercury contamination map by measuring water samples at over 50 locations in California (USA), taken from city tap water sources, rivers, lakes, and beaches. With its cost-effective design, field-portability, and wireless data connectivity, this sensitive and specific heavy metal detection platform running on cellphones could be rather useful for distributed sensing, tracking, and sharing of water contamination information as a function of both space and time.

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Crossref · 10.1021/nn406571t

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Metadata

Authors
Wei, Q., Nagi, R., Sadeghi, K., Feng, S., Yan, E., Ki, S. J., Caire, R., Tseng, D., & Ozcan, A.
Venue
ACS Nano
Published
2014-01-28
Volume
8
Issue
2
Pages
1121-1129
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W2016736813
Cited by
400
References
38
FWCI
28.47
Type
journal article
Language
en
Open access
hybrid

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