96/01086 Infrared spectrometric and gas chromatographic determination of the soluble organic matter from rock samples (oil shales)

1996 ◽  
Vol 37 (1) ◽  
pp. 65
Keyword(s):  
Organic Matter ◽  
Chromatographic Determination ◽  
Soluble Organic Matter ◽  
Rock Samples ◽  
Oil Shales

scholarly journals Quantitative determination of organic adsorption capacity in the Palaeozoic shales from South China

2021 ◽  
pp. 014459872098303
Author(s):  
Sibo Wang ◽  
Zhiguang Song ◽  
Jia Xia ◽  
Yuan Gao ◽  
YaoPing Wang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Clear Understanding ◽  
Soluble Organic Matter ◽  
Maximum Increase ◽  
Immature Oil ◽  
Methane Sorption ◽  
Oil Shales ◽  
The Impact ◽  
Total Adsorption

In this study, the methane adsorption capacity of kerogen isolated from the Cambrian, Silurian, and Permian shales and the impact of soluble organic matter (SOM) on the adsorption capacity of these shales were investigated. The results reveal that 1) the adsorption capacity of kerogen varies in a broad range, from 14.48 to 23.22 cm3/g for the Cambrian kerogens, from 15.50 to 36.06 cm3/g for the Silurian kerogens, and from 10.71 to 11.15 cm3/g for the Permian kerogens; 2) the kerogen adsorption accounts for 33.67–70.23% of the total adsorption capacity of these Palaeozoic extracted shales, demonstrating that kerogen is the primary adsorbing substance in shales; 3) the adsorption isotherms of kerogen in highly mature Cambrian and Silurian shales are similar to those of Triassic coal, while the isotherms of kerogen in the relatively immature Permian shales are similar to those of the immature oil shales; and 4) the SOM demonstrates a significant impact on the adsorption capacity of shales as the removal of SOM can cause a maximum increase of 34.29% or a decrease of 23.36% in the total adsorption capacity of shales. However, there is no clear understanding of the impact of SOM on the methane sorption of shales.

COMPARISONS OF FOUR METHODS FOR DETERMINATION OF DEGREE OF PEAT HUMIFICATION (DECOMPOSITION) WITH EMPHASIS ON THE VON POST METHOD

1977 ◽  
Vol 57 (2) ◽  
pp. 109-117 ◽  
Author(s):  
W. STANEK ◽  
T. SILC
Keyword(s):  
Organic Matter ◽  
Fiber Content ◽  
Soluble Organic Matter

The degree of decomposition (humification) of 10 peats, ranging from undecomposed to completely decomposed, was determined by the following methods: (1) von Post’s method using 10 classes of humification, (2) pyrophosphate-soluble organic matter determination using an index derived from Munsell color charts, (3) unrubbed fiber content in percent of total, (4) rubbed fiber content in percent of total. All four methods provided reliable and useful information. The von Post method requires no instrumentation and is therefore most suitable for field use. It is the least time-consuming and the cheapest of the four methods. The pyrophosphate method is best suited to use in a laboratory. It does not always readily differentiate grades of well humified and completely humified peats. Both methods of determining fiber content require instrumentation and a steady, running stream of water. The rubbed fiber content more accurately characterizes the amounts of undecomposed fiber in peat. In the range of humic peats the two latter methods tend to differentiate fewer classes than does the von Post method. For the convenience of the reader the four methods are described in detail in the Appendix.

Gas-Liquid Chromatographic Determination of Diflubenzuron (Dimilin) in Water as Its Trifluoroacetyl Derivative

1977 ◽  
Vol 60 (1) ◽  
pp. 213-217
Author(s):  
Brian L Worobey ◽  
G R Barrie Webster
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Pond Water ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Florisil Column ◽  
Freundlich Equation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A new gas-liquid chromatographic (GLC) procedure has been developed for the analysis of diflubenzuron, 1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl) urea, in pond water. The residues from fortified pond water were extracted with ethyl acetate, derivatized, and cleaned up on a mini Florisil column. The diflubenzuron was determined by GLC as its N,N′-di(trifluoroacetyl) derivative, using electron capture detection. A 50% full scale deflection was obtained with 0.03 ng injected. Recoveries from fortified unfiltered pond water were 65.7, 72.8, 82.0, and 90.8% at the 0.020, 0.059, 0.197, and 0.788 mg/L (ppm) levels, respectively. Recoveries from fortified filtered pond water were 94.1 and 89.3% at the 0.020 and 0.060 mg/L levels, respectively. It is postulated that diflubenzuron is immobilized by adsorption, for example, to particulate organic matter in the pond water because recovery data from unfiltered water followed the linear form of the Freundlich equation.

Determination of Nitrate in Feeds

1965 ◽  
Vol 48 (3) ◽  
pp. 648-653
Author(s):  
D W Hatcher ◽  
E D Schall
Keyword(s):  
Organic Matter ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Soluble Organic Matter ◽  
Nitrate Level ◽  
Low Level ◽  
Low Levels ◽  
Layer Chromatography

Abstract Attempts to measure nitrate at the low levels found in feeds by existing methods failed due to interferences from the soluble organic matter extracted from the samples along with the nitrate. The difficulties increased as the nitrate level decreased. A method for low-level materials was developed in which nitrate was isolated from interfering substances by thin-layer chromatography, eluted quantitatively from the absorbent, and measured colorimetrically by a modification of the 3,4-xylenol method. The procedure will determine nitrate accurately down to 10 ppm or less.

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