2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 9:45 AM - 10:00 AM | HANDHELD PHOTOMETERS: OPEN SOURCE, SMARTPHONE-BASED, AND LOW COST COMMERCIAL OPTIONS | 301B

HANDHELD PHOTOMETERS: OPEN SOURCE, SMARTPHONE-BASED, AND LOW COST COMMERCIAL OPTIONS

NECi was founded in 1992 based on academic research into the biochemistry and molecular biology of nitrogen metabolism in plants. Our lab developed commercial-scale production methods for the enzyme Nitrate Reductase (NaR). NaR reduces nitrate to nitrite – making it a great reagent for nitrate detection, replacing cadmium in standard methods. The SBIR program of the USDA funded development of simplified versions of the method for accurate on site, or field, test kits. Nitrate results are pink, detectable by eye, but users wanted data in digital format: numbers. And then we developed an enzyme-based method for phosphate, with results in the UV. We could not find a handheld, low cost, portable, easy to use photometer that read standard cuvettes. NSF funded development of a smartphone-based, handheld photometer with a real “optical bench”. The “brains” of the photometer are an Android app; data is transmitted via Bluetooth. Instructions to fabricate this beta-tested, single wavelength version were published in 2015 in an open source journal. A dual wavelength version for nitrate and phosphate with improved data handling is commercially available.

C34 Science and Policy
C36 Water Resource Management
S07 Conducting freshwater science with open-source, inexpensive technologies

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Presenters/Authors

Ellen R Campbell (), NECi, ellenr@nitrate.com;