Concerning the putative presence of nitrate in lignites

Painter, Paul C.; Youtcheff, Jack; Given, P.H.

doi:10.1016/0016-2361(80)90183-0

Cited by 18 publications

(4 citation statements)

References 5 publications

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“…In spectra (c) and (d) (Fig. 1), tile sharp bands near 1380 cm-' may arise from inorganic nitrates formed during the treatment process [28]~ because these samples have higher ash content (Table 1)than samples (a) and (b) (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

Studies of the soluble part of oxidised coals

et al. 2004

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Soluble products obtained from the oxidation of four types of coal, each characterised by different degree of coalification and different degree of sulphur content, are studied. The coals are oxidised with peracetic acid (PAA) and nitric acid. Analyses are performed by Atmospheric Pressure Temperature Programmed Reduction (AP TPR) and Fourier Transform Infl'ared Spectroscopy (FTIR). The soluble products contain much more sulphur than the insoluble products of oxidation. The products obtained fl'om the reaction with HNO3 contain higher amounts of inorganic sulphur compounds, while those obtained fl'om the reaction with PAA are characterised by an increased content of organic sulphur species.

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Section: Resultsmentioning

confidence: 99%

Studies of the soluble part of oxidised coals

et al. 2004

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“…FTIR has been used successfully in the qualitative and quan titative analysis of mineral matter in coal (1,5,13). The success of these methods relied heavily on computer subtraction techniques.…”

Section: Resultsmentioning

confidence: 99%

“…Fourier transform infrared (FTIR) spectroscopy has been used extensively in the past several years in the study of coal and its related products (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). The majority of this work has been done by transmission spectroscopy utilizing the KBr pellet technique.…”

mentioning

confidence: 99%

Chemistry and Structure of Coals

Smyrl¹,

Fuller²

1982

ACS Symposium Series

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“…The sulfates and nitrates are formed from the oxidation and fixation of organic S (Miller et al, 1979) and N (Painter et al, 1980) during the low-temperature plasma ashing. Cations, which include Al +3 , Mg +2 , Na + , K + , and Ca +2 , are probably present in the peat as metal-organic complexes (Kharaka et al, 1986;Neuzil et al, this volume) and other organic-cation complexes.…”

Section: Discussionmentioning

confidence: 99%

Inorganic constituents from samples of a domed and lacustrine peat, Sumatra, Indonesia

Ruppert

Neuzil

Cecil

et al. 1993

Geological Society of America Special Papers

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Two peat cores and one substrate core were collected from the Siak Kanan domed peat deposit in Riau Province, eastern Sumatra, Indonesia. The peat cores consisted of a 9.5-m core from the subaerial part of the domed peat and a 0.51-m core from the bottom of a lake located within the dome. Approximately 1.0 m of substrate material was obtained from a core from the bottom of the lake adjacent to the lacustrine peat core. Samples from selected intervals from the peat cores and from the underlying mineral substrate were low-temperature ashed and examined using light-optical, cathodoluminescent, and scanning electron microscopy, as well as by energy-dispersive X-ray analysis to chemically characterize the inorganic constituents. In addition, some of the ashed samples were analyzed by inductively coupled plasma-atomic emission spectroscopy and Fourier-transform infra-red spectrometry techniques.The low-temperature ash (LTA) of the peat samples is composed of discrete grains of biologic origin and volcanic eolian origin and aggregates of micrometer to submicrometer-sized particles that are largely artifacts of low-temperature ashing. Most of the aggregate material, which makes up approximately 90% of the LTA, probably results from reactions between organically bound cations and S and N which produce sulfate and nitrate compounds. All the Na, Ca, and Mg, and most of the K and the Al in the peat are concentrated in the aggregate fraction. The sulfate and the nitrate salts are readily soluble in water.Different suites of siliceous organisms that may have potential for environmental indicators are present in the lacustrine and domed peat intervals. In addition, rare but identifiable volcanic constituents are present in the samples of all the peat intervals. The volcanic constituents include glass shards, feldspars, zircons, and blue luminescent quartz. Most of the quartz grains from intervals of samples from the lake peat luminesce, however, in the orange plus blue range, which is indicative of a metamorphic origin. Phytoliths and siliceous organisms from samples of both the peats and the substrate intervals did not luminesce in the visible range, which is a characteristic of authigenic quartz and, apparently, biogenic silica. Biogenic silica grains, quartz grains, and other silicate minerals observed in the peat have etching features that may be caused by simple dissolution or interactions with multiple types of multiprotic organic acids. Dissolution and precipitation features are visible on quartz grains from the mineral substrate samples immediately below the peats.

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Concerning the putative presence of nitrate in lignites

Cited by 18 publications

References 5 publications

Studies of the soluble part of oxidised coals

Studies of the soluble part of oxidised coals

Chemistry and Structure of Coals

Inorganic constituents from samples of a domed and lacustrine peat, Sumatra, Indonesia

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