Topic
CHN analyzer
About: CHN analyzer is a research topic. Over the lifetime, 49 publications have been published within this topic receiving 3594 citations.
Papers
TL;DR: In this paper, two methods for determination of organic carbon, inorganic carbon, and total nitrogen in sediments, sediment trap materials, and plankton are described, using an automated CHN analyzer for all elemental determinations.
Abstract: Two methods are described for determination of organic carbon, inorganic carbon, and total nitrogen in sediments, sediment trap materials, and plankton. Both methods discriminate organic and inorganic carbon by acidification, avoid losses of acid-soluble organic and inorganic matter, and utilize an automated CHN analyzer for all elemental determinations. Short-term precisions for organic carbon and total nitrogen are about ± 1% of the measured value with blank levels < 1.5 µg for each element.
1,291 citations
TL;DR: In this article, the yield of organic C or total organic matter from a standard carbonate-free marine sediment containing 23.04% N-acetyl glucosamine (10% organic C) was determined using a CHN analyzer on untreated sediment, CHN analysis of acidified and filtered sediment, 3) CHN analyses on acidified centrifuged sediment, 4) wet oxidation by the Walkley and Black method, and 5) loss on ignition at 475-500°C.
Abstract: The yield of organic C or total organic matter from a standard carbonate-free marine sediment containing 23.04% N-acetyl glucosamine (10% organic C) was determined using 1) a CHN analyzer on untreated sediment, 2) CHN analysis of acidified and filtered sediment, 3) CHN analysis of acidified centrifuged sediment, 4) wet oxidation by the Walkley and Black method, and 5) loss on ignition at 475–500°C. 100% of the organic C added was recovered by CHN analysis of untreated sediment, but after treatment with acid (necessary to remove carbonates from most sediments) only 0.19% and 1.32% of the C added could be recovered. Wet oxidation yielded only 76.6% organic C. Loss on weight after combustion in a muffle furnace yielded 100% of the total organic matter. It is very difficult to avoid carbonate interference if simple techniques of analysis are used. For most work by marine ecologists organic carbon and nitrogen may be measured by a combination of CHN analysis and loss of weight on ignition of sediments freed of organic matter by precombustion below 500°C.
411 citations
TL;DR: In this article, the authors collected from ten salt and brackish-water marshes of North Carolina and analyzed for organic matter content by loss on ignition (LOI) and Kjeldahl nitrogen (KN).
Abstract: Soils (n=250) were collected from ten salt and brackish-water marshes of North Carolina and analyzed for organic matter content by loss on ignition (LOI) and Kjeldahl nitrogen (KN). Total organic carbon and total nitrogen were determined on the same samples using an elemental CHN analyzer. Regression analyses indicated that LOI and KN were excellent estimators of organic C (R2=0.990) and total N(R2=0.986), respectively, in low clay content (0–11%) marsh soils containing a wide range of soil organic C (0.1–28%) and total N (0–1.6%). A quadratic equation best described the relationship between organic C and organic matter (Organic C=0.40 [LOI] +0.0025 [LOI]2) while a linear model accurately described the relationship between total N and Kjeldahl N (Total N=1.048 [KN]−0.010). The proportion of organic C in organic matter (C/OM) increased with increasing soil organic matter content, probably as a result of aging. Young marshes, which are characterized by low soil organic content contain C/OM ratios similar to emergent vegetation (40–45%). In old organic soils (70–80% organic matter), C/OM increased to 57–60% due to accumulation of reduced organic materials.
340 citations
TL;DR: The difference-on-ignition (DOI) method is recommended for routine measurements of OC in marine sediments, because the more elaborate HCl method produces high and unstable baselines on the recorded CHN-chromatographs and is liable to corrode the interior ofCHN-analyzers.
274 citations
TL;DR: An automated CHN Analyzer was compared with the Walkley-Black and Kjeldahl methods for organic carbon (C) and nitrogen (N) in this paper, and four organic compounds, twenty nine plant materials and five soils were tested.
Abstract: An automated CHN Analyzer was compared with the Walkley‐Black and Kjeldahl methods for organic carbon (C) and nitrogen (N). Four organic compounds, twenty nine plant materials and five soils were t...
254 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2019 | 1 |
| 2018 | 1 |
| 2015 | 5 |
| 2014 | 2 |
| 2013 | 1 |