Organic elemental analysis

Sheng., Tsu; Gutterson, Milton.

doi:10.1021/ac60313a017

Cited by 21 publications

(9 citation statements)

References 300 publications

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“…TC and total inorganic carbon (TIC) content were measured using a UIC model 5011 CO2 Coulometer, with TOC determined by subtraction of TIC from TC. Total nitrogen (TN) was determined in a Variomax C/N following the Dumas' method (Ma & Gutterson, 1970). BSi was extracted following the alkaline leaching technique (Mortlock & Froelich, 1989), measuring the resulting extract by the molybdate blue colorimetric method (Hansen & Grashoff, 1983) using an AutoAnalyser Technicon II.…”

Section: Methodsmentioning

confidence: 99%

Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake

Bao

Hernández

Sáez

et al. 2015

Quaternary Science Reviews

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25The coupling of lake dynamics with the catchment biogeochemistry has been considered the key 26 element controlling primary production in mountain lakes at time scales of a few decades to millennia. 27Yet, little is known on the effects produced by changes in the morphometry of lakes throughout their 28 ontogeny. Lake Chungará (Central Andean Altiplano, northern Chile) experienced long-term lake-level 29 fluctuations that strongly modified its area:volume ratios, making it an ideal system to explore the 30 relative role that long-term climatic shifts and changes in morphometry play on biosiliceous lacustrine 31 productivity. In this paper we review previous data on percent content of total organic carbon, total 32 inorganic carbon, total nitrogen, total biogenic silica, isotopic composition of organic matter, 33carbonates, and diatom frustules, as well as on the abundances of the chlorophycean Botryococcus 34 braunii in this lake for the period 12,400-1,300 cal yr BP. We also include new data on organic carbon 35 and biogenic silica mass accumulation rates and diatom assemblages composition of an offshore core 36 dated with 14 C and U/Th. 37Biosiliceous productivity was primarily influenced by shifts in allochthonous nutrient inputs related 38 to precipitation variability. Humid phases dated at c. 12,400 to 10,000, 9,600 to 7,400 and 3,550 to 39 1,300 cal yr BP, coincide with periods of elevated productivity. Conversely, falls in productivity were 40 recorded during arid phases dated at c. 10,000 to 9,600 and 7,400 to 3,550 cal yr BP (Andean mid- 41Holocene Aridity Period). Yet, morphometry-related in-lake controls provoked that there was not a

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Section: Methodsmentioning

confidence: 99%

Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake

Bao

Hernández

Sáez

et al. 2015

Quaternary Science Reviews

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“…Elemental analysis was conducted as C/H/N/S analyses (oxygen was determined indirectly) on an EA 1108 CHNS-O elemental analyzer (CarloErba Instruments, CE Elantech, Inc.). 38 …”

Section: Methodsmentioning

confidence: 99%

High-Resolution Profiling of the Functional Heterogeneity of Technical Lignins

et al. 2022

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In technical lignins, functionality is strongly related to molar mass. Hence, any technical lignin exhibits concurrent functionality-type distribution (FTD) along its molar mass distribution (MMD). This study combined preparative size-exclusion chromatography with offline characterizations to acquire highly resolved profiles of the functional heterogeneity of technical lignins, which represent crucial information for their material use. The shape of these profiles showed considerable dissimilarity between different technical lignins and followed sigmoid trends. Determining the dispersity in functionality ( Đ F ) of lignins via their FTD revealed a rather homogeneous distribution of their functionalities ( Đ F of 1.00–1.21). The high resolution of the acquired profiles of functional heterogeneity facilitated the development of a robust calculation method for the estimation of functional group contents of lignin fractions based simply on their MMD, an invaluable tool to simulate the effects of intended purification processes. Moreover, a more thorough evaluation of separations based on functionality becomes accessible.

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“…All samples (3 mg per analysis) were thoroughly dried prior to elemental analysis and stored under an inert atmosphere. Elemental analysis was performed as C/H/N/S (oxygen was determined indirectly) analyses on an EA 1108 CHNS-O (Carlo Erba Instruments, CE Elantech, Inc.) elemental analyzer …”

Section: Methodsmentioning

confidence: 99%

“…Elemental analysis was performed as C/H/N/S (oxygen was determined indirectly) analyses on an EA 1108 CHNS-O (Carlo Erba Instruments, CE Elantech, Inc.) elemental analyzer. 41 Preparation of Lignin Samples for Headspace GC/MS. For the determination of sulfonic acid groups in LS, 5−15 mg of LS was weighed into 10 mL headspace vials.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…This study presents a comparison of two established methods for sulfonic acid determination, namely, elemental analysis and conductometric titration, , with a novel headspace GC/MS method, by means of various LS samples. The two conventional methods provided reference data against which the new method for the determination of sulfonic acid was evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Sulfonic Acid Group Determination in Lignosulfonates by Headspace Gas Chromatography

Korntner

Schedl

Sumerskii

et al. 2018

ACS Sustainable Chem. Eng.

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A method for the determination of the sulfonic acid content in lignosulfonates via sulfur dioxide quantification upon treatment with H3PO4 by headspace gas chromatography is presented and compared to two already established alternatives, conductometric titration and elemental analysis. Several lignosulfonates, purified from various industrial sources, were examined by all three methods. Limitations and possible interference by other functional groups, such as carboxylic acids, are discussed, and suitable solutions are presented. Results of the novel approach are comparable to those of the established techniques in terms of accuracy and precision. The limit of detection (LOD) is 0.88 μmol of SO3H and the corresponding limit of quantification (LOQ) is 3.78 μmol of SO3H. At the same time, this method outperforms conductometric titration in terms of a higher sample throughput and a much smaller sample amount needed for analysis. Treatment of the sample with highly concentrated phosphoric acid and simple heating is straightforward enough to render the method a valuable tool in lignosulfonate analysis of industrial problem sets, such as screenings or optimization of process parameters, without compromising analytical accuracy.

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Organic elemental analysis

Cited by 21 publications

References 300 publications

Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake

Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake

High-Resolution Profiling of the Functional Heterogeneity of Technical Lignins

Sulfonic Acid Group Determination in Lignosulfonates by Headspace Gas Chromatography

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