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Continuous-Flow Analysis for Determination of Nitrate Using Hydrazine-Copper Method in Plan  

Park, Yang-Ho (National Institute of Agricultural Science and Technology)
Park, So-Hyeon (National Institute of Agricultural Science and Technology)
Lee, Ju-Young (National Institute of Agricultural Science and Technology)
Jang, Byoung-Choon (National Institute of Agricultural Science and Technology)
Lee, Ki-Sang (National Institute of Agricultural Science and Technology)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.4, 2006 , pp. 204-208 More about this Journal
Abstract
This study is to describe continuous-flow analysis (CFA) for the determination of nitrate using hydrazine-copper in plant material and to test precision of this method compared with that of methods, which are RQflex method and salicylic acid method. Samples were leaves of watermelon, cucumber, melon and tomato. Nitrate values measured by the RQflex method were greater than those measured by CFA or salicylic acid method. The correlation of nitrate values between those measured by CFA and salicylic acid method was $R^2=0.9671$, and those measured by CFA between those measured by RQflex method was $R^2=0.9739$. Recovery rate of nitrate added to tissue extract by CFA method was $99.7{\pm}0.25%$.
Keywords
Nitrate; Continuous-flow analysis (CFA); Salicylic acid method; and RQflex;
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