Non-Enzymatic Gaseous Loss of Nitrite From Clay and Soil Systems

EFFECTS OF TEMPERATURE ON NO3− AND NO2− REDUCTION, NITROGENOUS GAS PRODUCTION, AND REDOX POTENTIAL IN A SATURATED SOIL

“…Because denitrification of NO" was inhibited at 5 C, it is likely that the reduction of NO,-at 5 C (Fig. 1) was due to chemodenitrification processes as was suggested by Wullstein and Gilmour (1964), Reuss and Smith (1965), and Nelson and Bremner (1970).…”

“…NOt, however, is also reduced by chemodenitrification processes to NO (Wullstein and Gilmour 1964: Reuss and Smith 1965: Nelson and Bremner 1970.…”

Chemical transformations of nitrite in soils

“…The data show that there was no copper and very shaking soil (20 g.) with little iron in NaCl extracts of these soils. Tables 26-28, it seems very unlikely that chemodenitrification in soils is promoted by metallic cations as postulated by Wullstein and Gilmour (1964).…”

“…Sig nificant concentrations of ferrous ions have been detected in waterlogged soils, but chemodenitrification has thus far been observed only in well-aerated soilso It is difficult to explain Wullstein and Gilmour's (1964) findings that extraction of kaolinite and an Oregon soil with IM NaCl reduced the amount of NO produced when these materials were treated with nitrite and that the NaCl extracts contained metal ions which promoted decomposition of nitrite. To check their findings, five Iowa soils were extracted with IM NaCl and the reactions of the extracts and extracted soils with nitrite were compared with those of the unextracted soils.…”

“…An examination of the standard electrode potentials of various metallic cation-nitrous acid couples as calculated from data of Latimer (1938) and Chao and Kroontje (1963) Since an examination of the standard oxidation potentials of manganese and aluminum ions indicated that these ions cannot reduce nitrite, it is difficult to account for Wullstein and Gilmour's (1964) finding than manganese and aluminum ions pro moted decomposition of nitrite in acidic solutions.…”