Soil Organic Carbon: Relating the Walkley-Black Wet Oxidation Method to Loss on Ignition and Clay Content

Tuffour, Henry Oppong; Yeboah, Israel Boateng; Bonsu, Mensah; Adjei-Gyapong, Thomas; Khalid, Abdul Aziz; Abubakar, Awudu; Melenya, Caleb; Kpotor, Pearl

doi:10.12983/ijsrk-2014-p0249-0256

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…SOC concentration was analyzed using Walkley–Black wet oxidation method [ 19 , 20 ]. This method involves oxidation of organic matter by potassium dichromate with sulphuric acid followed by titration.…”

Section: Methodsmentioning

confidence: 99%

Variation in Soil Organic Carbon under Different Forest Types in Shivapuri Nagarjun National Park, Nepal

Shapkota

Kafle

2021

Scientifica

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Understanding distribution of soil organic carbon (SOC) in soil profile is important for assessing soil fertility and SOC stock because it varies with soils of different vegetation and land use types. In this context, the objective of this research is that it was conducted to determine key variance in the SOC stock in three different soil layers, 0–20 cm, 20–40 cm, and 40–60 cm of different vegetation covers of Shivapuri Nagarjun National Park of Kathmandu district, Nepal. Overall field measurement was based on standard national methods. We used the dichromate digestion method to analyse SOC concentrations. The highest SOC concentration (%) was recorded as 4.87% in 0–20 cm of oak forest and lowest 0.42% in 40–60 cm of Chir pine forest. Forest types (oak, upper mixed hardwood, lower mixed hardwood, and Chir pine) had SOC stock 149.62, 104.47, 62.5, and 50.85 t/ha, respectively, up to 60 cm depth. However, these values are significantly different ( p = 0.02 ) at 5% level of significance when comparing means between the forest types. The SOC stock was decreased with increased soil depth, though not significantly different at 5% level of significance. Further study with respect to different climate, soil, forest, and land use type is recommended.

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Section: Methodsmentioning

confidence: 99%

Variation in Soil Organic Carbon under Different Forest Types in Shivapuri Nagarjun National Park, Nepal

Shapkota

Kafle

2021

Scientifica

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“…Differing results regarding the correlation of carbon estimates using LOI and Walkley-black methods were also presented in other previous inquiries. A weak correlation (R 2 =0.35) between the SOC estimates from LOI and Walkley-Black methods was reported by Tuffour et al [39]. Using the Van Bemmelen organic matter-to-organic carbon conversion factor (0.58), Wang et al [40] derived a close relationship (R 2 =0.83) between the organic carbon values obtained through LOI and Walkley-Black methods.…”

Section: Carbon Content Of Urban Soils Based On Loi and Walkley-black...mentioning

confidence: 88%

Comprehensive evaluation of soil characteristics and carbon stocks variability in different urban land use types

Reyes,

Geronimo,

Choi

et al. 2024

Environmental Engineering Research

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The terrestrial environment generally serves as an important carbon pool. This study mainly assessed the properties and carbon storage capabilities of soils from different urban land uses. Soil samples from roads/highways, parks, institutional areas, and constructed wetlands were collected to assess the effects of soil sealing on the characteristics and carbon content of urban soils. Soil sealing and compaction greatly influenced urban soil properties by altering the mass-balance, thereby resulting in a disproportionate amount of inflow and outflow of compounds in the soil strata. Using the Walkley-Black and loss-on-ignition (LOI) methods of soil organic carbon (SOC) analysis demonstrated that LOI-based analysis yielded up to 26 times higher SOC values than the wet-oxidation method due to the high weight losses prompted by the volatilization of hygroscopic and structural water and thermal decomposition of carbonate-containing minerals. Further analyses indicated that open soils contain 5% to 78% higher percentage of organic carbon as compared with their sealed counterparts and top soil layers tend to have higher amounts of SOC due to the continuous deposition of carbon-containing compounds from external sources. Generally, the results of this inquiry can serve as a baseline for formulating strategies to augment pedologic carbon stocks in urban environments.

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“…The soil organic carbon (SOC) content was analysed using Walkley-Black wet oxidation method (Tuffour et al, 2014).…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

Phytoremediation potential of native plants: Biomonitoring approach in contaminated soils

Aydi

Salah

et al. 2023

Not Bot Horti Agrobo

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Phytoremediation has been used to remediate contaminated site. This study aims to investigate the potential of the selected native plants to accumulate and tolerate chemical pollutants. Two sites were selected in Southern Tunisia lands (Gabès), i) Gannouch located near the chemical industrial complex and ii) Zerkineis around 35 kilometres far from the industrial activities. Soil and plants were sampled and analysed for cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn) and fluorine (F) concentrations. The native plants were Bassia indica and Chenopodium album, with no obvious morphological toxic symptoms. Results indicated that the upper soil layers were alkaline and salt affected with low organic matter content. The highest levels of fluoride and heavy metal were found in Ghannouch. The contents of Cd, Cu, Pb, Zn and F in the roots, stem and leaves of the native plants exceed the normal ranges and the phytotoxic level. Bioconcentration factor (BCF), translocation factor (TF), and biological accumulation factor (BAF) were determined for each element. Based on these factors the selected plants were classified as excluders, indicators, and accumulators for each element. The native plants, studied herein, seems to have significant potential for phytoremediation, thus they may be used as biomonitors in contaminated soils. Bassia indica identified as Cd, Cu and Pb accumulator, could be an excellent candidate for phytoextraction and phyto stabilization because of its F excluder performance.

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Soil Organic Carbon: Relating the Walkley-Black Wet Oxidation Method to Loss on Ignition and Clay Content

Cited by 5 publications

References 23 publications

Variation in Soil Organic Carbon under Different Forest Types in Shivapuri Nagarjun National Park, Nepal

Variation in Soil Organic Carbon under Different Forest Types in Shivapuri Nagarjun National Park, Nepal

Comprehensive evaluation of soil characteristics and carbon stocks variability in different urban land use types

Phytoremediation potential of native plants: Biomonitoring approach in contaminated soils

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