scholarly journals Simple modification of the Walkley-Black method for simultaneous determination of organic carbon and potentially mineralizable nitrogen in tropical rice soils

1982 ◽  
Vol 69 (1) ◽  
pp. 73-77 ◽  
Author(s):  
K. L. Sahrawat
Keyword(s):  
Organic Carbon ◽  
Simultaneous Determination ◽  
Rice Soils ◽  
Simple Modification ◽  
Potentially Mineralizable Nitrogen ◽  
Mineralizable Nitrogen

scholarly journals Mineralization of soil organic nitrogen under waterlogged conditions in relation to other properties of tropical rice soils

Soil Research ◽  
1983 ◽  
Vol 21 (2) ◽  
pp. 133 ◽  
Author(s):  
KL Sahrawat
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Properties ◽  
Total Nitrogen ◽  
Organic Nitrogen ◽  
Wetland Rice ◽  
Organic Carbon Content ◽  
Rice Soils ◽  
Wide Range ◽  
Mineralizable Nitrogen

The mineralizable nitrogen pool in wetland rice soils plays a dominant role in the nitrogen nutrition of rice even in fertilized paddies. There is a lack of information on how different soil properties affect ammonification of organic nitrogen in wetland rice soils. Surface samples of 39 diverse Philippine soils representing a wide range of pH, organic matter and texture were studied to determine the relationships between ammonification of organic nitrogen and soil properties. Simple correlation analysis showed that ammonium production was correlated highly significantly with total nitrogen (r = 0.94**), organic carbon (r = 0.91**) and C/N ratio (r = -0.46**), but it was not significantly correlated with cation exchange capacity, clay or pH. Multiple regression analayses showed that organic matter (organic carbon and total nitrogen) accounted for most of the variation in mineralizable nitrogen. These results suggest that organic carbon content is a good index of mineralizable nitrogen in tropical wetland rice soils.

scholarly journals Application of a catalytic oxidation method for the simultaneous determination of total organic carbon and total nitrogen in marine sediments and soils

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252308
Author(s):  
Pavlos Avramidis ◽  
Vlasoula Bekiari
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Simultaneous Determination ◽  
Catalytic Oxidation ◽  
Correlation Coefficient ◽  
Marine Sediments ◽  
Titration Method ◽  
Data Set ◽  
Oxidation Method

This study presents the application of a simultaneous method for the determination of total organic carbon (TOC) and total nitrogen (TN) in marine sediments and soils, using a data set of 206 samples collected from coastal lagoonal/marine sedimentary environments and certified reference materials (CRMs). TOC and TN were determined using the high temperature (720°C) catalytic (Pt/Al2O3) oxidation method and the detection of TOC and TN was performed using an infrared or a chemiluminescence detector, respectively. Results from the abovementioned TOC method were compared with the results from the widely used Wakley-Black titration method, while TN results with these from elemental analysis. Analytical quality control experiments were performed using CRM samples. Method characteristics such as range of measurement, calibration, method detection limit (MDL), limit of quantification (LOQ), repeatability and reproducibility, were calculated. The precision and the accuracy of the methods are also discussed. Comparison of the two TOC methods of 206 data set yields a regression line of correlation coefficient with R2 = 0.985. Additional different levels of TOC concentrations of low <1%, moderate 1–5% and high 5–40% level were examined indicating very good correlations. The lowest correlation coefficient was observed in low concentrations TOC<1% (R2 0.825), mainly as a result of the limitation of titration method. The evaluation of TN results indicated that the catalytic oxidation method and the elemental analysishave a significant good correlation with R2 = 0.977. The results of precision and accuracy, as well as the calculated MDL and LOQ show that this is a reliable method. Moreover, it requires a small amount of the analyzed sample and the total analysis time is 10 min. Therefore, it can be easily applied for the fast and precise simultaneous determination of TOC and TN in sediment and soil samples.

scholarly journals Simultaneous Determination of Dissolved Organic Carbon and Total Dissolved Nitrogen on a Coupled High-Temperature Combustion Total Organic Carbon-Nitrogen Chemiluminescence Detection (HTC TOC-NCD) System

2005 ◽  
Vol 2005 (4) ◽  
pp. 240-246 ◽  
Author(s):  
Xi Pan ◽  
Richard Sanders ◽  
Alan D. Tappin ◽  
Paul J. Worsfold ◽  
Eric P. Achterberg
Keyword(s):  
High Temperature ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Data Acquisition ◽  
Simultaneous Determination ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Temperature Combustion ◽  
High Temperature Combustion

The marine biogeochemistries of carbon and nitrogen have come under increased scrutiny because of their close involvement in climate change and coastal eutrophication. Recent studies have shown that the high-temperature combustion (HTC) technique is suitable for routine analyses of dissolved organic matter due to its good oxidation efficiency, high sensitivity, and precision. In our laboratory, a coupled HTC TOC-NCD system with a sample changer was used for the automated and simultaneous determination of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) in seawater samples. TOC control software was used for TOC instrument control, DOC data acquisition, and data analysis. TDN data acquisition and manipulation was undertaken under LabVIEW. The combined system allowed simultaneous determination of DOC and TDN in the same sample using a single injection and provided low detection limits and excellent linear ranges for both DOC and TDN. The risk of contamination has been remarkably reduced due to the minimal sample manipulation and automated analyses. The optimised system provided a reliable tool for the routine determination of DOC and TDN in marine waters.

Wet-oxidation and automated colorimetry for simultaneous determination of organic carbon, nitrogen and phosphorus dissolved in seawater

1999 ◽  
Vol 66 (3-4) ◽  
pp. 161-169 ◽  
Author(s):  
Patrick Raimbault ◽  
Wilfried Pouvesle ◽  
Frédéric Diaz ◽  
Nicole Garcia ◽  
Richard Sempéré
Keyword(s):  
Organic Carbon ◽  
Simultaneous Determination ◽  
Wet Oxidation ◽  
Nitrogen And Phosphorus

SOIL POTENTIALLY MINERALIZABLE NITROGEN AND ITS RELATION TO RICE PRODUCTION AND NITROGEN NEEDS IN TWO PADDY RICE SOILS OF CHILE

2012 ◽  
Vol 35 (3) ◽  
pp. 396-412 ◽  
Author(s):  
J. Hirzel ◽  
K. Cordero ◽  
C. Fernández ◽  
J. Acuña ◽  
M. Sandoval ◽  
...  
Keyword(s):  
Paddy Rice ◽  
Rice Production ◽  
Rice Soils ◽  
Potentially Mineralizable Nitrogen ◽  
Mineralizable Nitrogen
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