Effects of Iron on the Molecular Weight Distribution, Light Absorption, and Fluorescence Properties of Natural Organic Matter

2007 ◽  
Vol 24 (8) ◽  
pp. 987-997 ◽  
Author(s):  
Michael J. Pullin ◽  
Charles Anthony ◽  
Patricia A. Maurice
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Molecular Weight Distribution ◽  
Natural Organic Matter ◽  
Weight Distribution ◽  
Light Absorption ◽  
Fluorescence Properties

Pretreatment of natural organic matter to control biological stability

2016 ◽  
Vol 2 (2) ◽  
pp. 298-303 ◽  
Author(s):  
Mahdi Bazri ◽  
Madjid Mohseni
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Molecular Weight Distribution ◽  
Natural Organic Matter ◽  
Weight Distribution ◽  
Biological Stability ◽  
Alum Coagulation

Impacts of UV/H2O2and alum coagulation on NOM molecular weight distribution and subsequent biostability of water were investigated.

Relationship between fluorescence characteristics and molecular weight distribution of natural dissolved organic matter in Lake Hongfeng and Lake Baihua, China

2006 ◽  
Vol 51 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Lanxiu Yue ◽  
Fengchang Wu ◽  
Congqiang Liu ◽  
Wen Li ◽  
Pingqing Fu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Fluorescence Characteristics

scholarly journals Molecular Weight Distribution of Kerogen with MALDI-TOF-MS

2020 ◽  
Author(s):  
Hyeonseok Lee ◽  
Mohammadreza Shokouhimehr ◽  
Mehdi Ostadhassan ◽  
Bo Liu ◽  
Arash Abarghani
Keyword(s):  
Mass Spectrometry ◽  
Molecular Weight ◽  
Organic Matter ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Rate Of Change ◽  
Molecular Structures ◽  
Thermal Maturity ◽  
Maldi Tof ◽  
Fine Grain

<p>Kerogen is an amorphous organic matter (AOM) in fine grain sediments, which produces petroleum and other byproducts when subjected to adequate pressure and temperature (deep burial conditions). Chemical characteristics of kerogen by considering its biogenic origin, depositional environment, and thermal maturity has been studied extensively with different analytical methods, though its molecular structure is still not fully known. In this study, conventional geochemical methods were used to screen bulk rock aliquots from the Bakken Shale with varying thermal maturities. Organic matter was isolated from the mineral matrix and then a mass spectrometry method was utilized to quantify molecular weight distribution (MWD) of four different kerogens at various thermal maturity levels (immature to late mature). Furthermore, to complement mass spectrometry, Fourier transform infrared (FTIR) spectroscopy was employed as a qualitative chemical and structural investigation technique. The MWD of four samples was obtained by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, and the results are correlated with the absorption indices (CH<sub>3</sub>/CH<sub>2</sub> ratio and aromaticity) calculated from the FTIR attenuated total reflectance (ATR) method. The results showed when the degree of maturity increases, the aliphatic length shortens, and the branching develops, as well as the aromatic structure becomes more abundant. Moreover, based on the MWD results, higher maturity kerogen samples would consist of larger size molecular structures, which are recognized as more developed aromatic, and aliphatic branching stretches. The combination of infrared spectroscopy (AFT-FTIR) and mass spectrometry (MALDI-TOF) provided MWD variations in kerogen samples as a function of maturity based on varying absorption indices and revealed the rate of change in molecular mass populations as a function of thermal maturity.</p>

Molecular Weight Distribution and Removal Characteristics in Source Water of Ganjiang River

2010 ◽  
Vol 113-116 ◽  
pp. 1007-1012 ◽  
Author(s):  
Zhen Gong Tong ◽  
Cai Xia Kang
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Dominant Role ◽  
High Water ◽  
Middle Part ◽  
Raw Water ◽  
Ultra Filtration ◽  
Low Efficiency

Raw water in the Nanchang district of Ganjiang River and water after conventional treatment were estimated by the method of the ultra filtration to find out its molecular weight distribution. According to the result, the molecular weight distribution of the raw water in Ganjiang River shows the trend which has the large edges and small middle part, that is to say; the organic matter mainly centralizes in a scope whose molecular weight are larger than 30ku and less than 1ku, the middle part occupies a relatively small proportion. In winter low-water season, there is little organic matter in the river and the small molecular of the organic matter plays a dominant role. In the season of high-water, the amount of organic matter increases, and while the small molecular of organic matter decreases and large molecular of organic matter becomes a large part. The popular water purifying process in Nan Chang city is just to mainly remove the large molecular in the organic matter, which leads to a bad result，the low efficiency of removing the small molecular.

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