Photometer for Nitrate Testing
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BOM and instructions are available at http://www.appropedia.org/Open-Source_Photometric_System_for_Enzymatic_Nitrate_Quantification. Technical details can be found in the paper Wittbrodt BT, Squires DA, Walbeck J, Campbell E, Campbell WH, Pearce JM published in 2015 as Open-Source Photometric System for Enzymatic Nitrate Quantification with a DOI of 10.1371/journal.pone.0134989 and accessed freely through https://www.academia.edu/14702947/Open-Source_Photometric_System_for_Enzymatic_Nitrate_Quantification
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