Study on Influence of Soil Minerals on Determination of Red Soil Organic Matter Content by Loss-on-ignition Method

LIU Yan; DONG Ming; HUANG Qian; LIANG Jiafeng; WANG Mengjie

doi:10.11924/j.issn.1000-6850.casb2024-0628

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Chin Agric Sci Bull ›› 2025, Vol. 41 ›› Issue (12) : 74-79. DOI: 10.11924/j.issn.1000-6850.casb2024-0628

Study on Influence of Soil Minerals on Determination of Red Soil Organic Matter Content by Loss-on-ignition Method

LIU Yan ¹^,² ,
DONG Ming ² ,
HUANG Qian ³ ,
LIANG Jiafeng ⁴ ,
WANG Mengjie ⁵

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Abstract

To explore the influence of soil minerals on the determination of soil organic matter by loss-on-ignition method, this paper selected the low organic matter red soil (the content of organic matter was 0.49% by potassium dichromate oxidation method) with relatively simple and convenient mineral composition in the eastern margin of Kunming Basin as the research object to carry out the analysis work. The soil sample was mainly composed of three parts: clay minerals, iron (hydrogen) oxides and detrital minerals. The composition and relative content of various minerals were determined by X-ray diffractometer and atomic absorption spectrometer, and the composition changes before and after burning loss were compared and analyzed. The analysis showed that clay minerals in soil samples were mainly composed of gibbsite, kaolinite and montmorillonite, iron (hydrogen) oxides were mainly hematite and goethite and detrital minerals were mainly quartz and albite. After burning at 550°C, the X-ray diffraction pattern of clay minerals and iron (hydrogen) oxides changed significantly, indicating that they were decomposed at high temperatures. According to the content of each mineral in the soil sample and their theoretical dehydration (or dehydroxylation) decomposition, it was found that only the thermal decomposition of clay minerals could contribute nearly 90% of the loss on ignition of the soil sample. Iron (hydrogen) oxides could also contribute 6% of the loss-on-ignition, leaving less than 4% of the loss-on-ignition (0.44%) contributed by organic matter. This calculation result was very close to the organic matter content determined by the potassium dichromate oxidation method. This study showed that the thermal decomposition of clay minerals and iron (hydrogen) oxygen compounds was the main reason that affected the accurate determination of soil organic matter content by the loss-on-ignition method. For red soil samples, the resulting error may be more than several times that of soil organic matter content.

Key words

soil minerals / loss-on-ignition method / red soil / soil organic matter / X-ray diffractometer / atomic absorption spectrometer

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LIU Yan , DONG Ming , HUANG Qian , et al . Study on Influence of Soil Minerals on Determination of Red Soil Organic Matter Content by Loss-on-ignition Method[J]. Chinese Agricultural Science Bulletin. 2025, 41(12): 74-79 https://doi.org/10.11924/j.issn.1000-6850.casb2024-0628

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