Oxidation and fate of chromium in soils |
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Authors: | Jae Gon Kim Joe B. Dixon |
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Affiliation: | 1. Department of Earth System Sciences , Yonsei University , 134 Shinchondong Seodaemoongu, Seoul, 120-749, Korea;2. Department of Soil and Crop Sciences , Texas A&3. M University , College Station, TX, 77843-2474, USA;4. Department of Soil and Crop Sciences , Texas A& |
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Abstract: | Abstract The ammonia electrode method was used to characterize soil organic nitrogen. Amide-N, α-amino-N and hexosamine-N were estimated by measuring the ammonium-N derived from each organic-N with an ammonia electrode after hydrolysis of standard compounds followed by certain treatments. Each organic-N was recovered quantitatively from each standard compound in the presence and absence of soil. Twenty soil samples were analyzed for the above forms of organic nitrogen by both the distillation and electrode methods. The results obtained by the ammonia electrode method for each form of organic nitrogen agreed closely with those obtained by the distillation method. The electrode method was preferred for subsequent soil studies since it is simple and sensitive. |
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Keywords: | Ba barite labile and solid forms of Cr(VI) pH reactive Mn oxide |
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