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http://dx.doi.org/10.7745/KJSSF.2011.44.3.387

Particle Size Effects of Devarda's Alloy on the Recovery of Nirate N Determined by the Steam Distillation Method  

Jung, Seok-Ho (Department of EnvironmentBiological Chemistry, Chungbuk National University)
Kwon, Hyun-Jae (Department of EnvironmentBiological Chemistry, Chungbuk National University)
Chung, Doug-Young (Department of Bioenviromental Chemistry, Chungnam National University)
Han, Gwang-Hyun (Department of EnvironmentBiological Chemistry, Chungbuk National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.44, no.3, 2011 , pp. 387-393 More about this Journal
Abstract
We analyzed the particle size distributions of three commercially available Devarda's alloy (DA) products, tested the nitrate recoveries of each particle size category, and examined the amounts of DA required for 100% recovery by varying $NO_3$-N concentration from 0.5 to 10 mg. We observed that use of DA coarser than 200 mesh resulted in poor analytical recovery (<80%). While the tested alloys were considered to be fine enough (>90% of the particles were less than 100 mesh), the recovery dramatically declined from 80% to 10% in a high concentration range (4 to 10 mg N). Satisfactory recovery was obtained by increasing the amount of finer DA (less than 300 or 450 mesh). However, there was no quantitative relationship between the amount of fine DA and nitrate recovered. Generally, the amount of nitrate reduced per unit DA decreased as the recovery efficiency declined. These results suggest that a sufficient amount of DA must be determined based on particle size distribution, and that treatment of at least two levels of DA and comparison of the subsequent change in nitrate recovery is required for soils containing high levels of nitrate. In addition, further studies are encouraged to account for the observed stoichiometric dis-equivalence of recovered nitrate N per unit mass of DA.
Keywords
Reducing agent; Soil contamination; Water pollution; Conversion Efficiency; Soil management;
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