* Wittbrodt BT, Squires DA, Walbeck J, Campbell E, Campbell WH, Pearce JM. (2015) [http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134989 Open-Source Photometric System for Enzymatic Nitrate Quantification]. ''PLoS ONE'' '''10'''(8): e0134989. doi: 10.1371/journal.pone.0134989 [open access]
* This project derived from: [[Open-source mobile water quality testing platform]]
* OpenSCAD code:
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[[Nitrate]], the most oxidized form of nitrogen, is regulated to protect people and animals from harmful levels as there is a large over abundance due to anthropogenic factors. Widespread field testing for nitrate could begin to address the nitrate pollution problem, however, the Cadmium Reduction Method, the leading certified method to detect and quantify nitrate, demands the use of a toxic heavy metal. An alternative, the recently proposed [[Environmental Protection Agency]] Nitrate Reductase Nitrate-Nitrogen Analysis Method, eliminates this problem but requires an expensive proprietary spectrophotometer. The development of an inexpensive portable, handheld photometer will greatly expedite field nitrate analysis to combat pollution. To accomplish this goal, a methodology for the design, development, and technical validation of an improved open-source water testing platform capable of performing Nitrate Reductase Nitrate-Nitrogen Analysis Method. This approach is evaluated for its potential to i) eliminate the need for toxic chemicals in water testing for nitrate and nitrite, ii) reduce the cost of equipment to perform this method for measurement for water quality, and iii) make the method easier to carryout in the field. The device is able to perform as well as commercial proprietary systems for less than 15% of the cost for materials. This allows for greater access to the technology and the new, safer nitrate testing technique.
==Bill of Materials==
Cost breakdown of the photometer case and electronics (Digikey part # unless externally referenced).
|left]][[image:nitraates2.png|600px |left]]< br>
==How to use it==
| OS spectrometer being used to test soil with simplified nitrate test kit.
For more information on the test kits, contact NECi Superior Enzymes at 888.NITRATE or visit [http://www.nitrate.com nitrate.com].
* [[Open-source hardware]]
[[Category:MOST completed projects and publications]]