Understanding the magnetic susceptibility measurements by using an analytical scale

Cano, M. E.; Córdova–Fraga, Teodoro; Sosa, M.; Bernal‐Alvarado, J.; Baffa, Oswaldo

doi:10.1088/0143-0807/29/2/015

Cited by 23 publications

(19 citation statements)

References 9 publications

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“…Magnetic susceptibility value (MS) "χ" was measured in the laboratory for all collected samples, using an analytical balance according to CANO et al (2008) method, and fitted to soil MS reading by SIQUEIRA et al (2010b). Equipment consists of an analytical balance, one magnet, and one magnet and sample support.…”

Section: Methodsmentioning

confidence: 99%

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

et al. 2014

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ABSTRACT:There is an increasing demand for detailed maps that represent in a simplified way the knowledge of the variability of a particular area or region maps. The objective was to outline precision boundaries among areas with different accuracy variability standards using magnetic susceptibility and geomorphic surfaces. The study was conducted in an area of 110 ha, which identified three compartment landscapes based on the geomorphic surfaces model. To determinate pH, organic matter, phosphorus, potassium and magnesium, the total sand and clay, 514 soil samples were collected at depths of 0-0.20 m and 0.60-0.80 m. The sum of base, cationic exchange capacity and base saturation were calculated and the magnetic susceptibility was evaluated in the laboratory using a system based on a balance of analytical precision method. Geomorphic surfaces identification allowed setting specific management areas (locations with maximum homogeneity of soil attributes). The map of spatial variability of magnetic susceptibility can be used to validate the precise boundaries among geomorphic surfaces identified in the field and infer the variability of clay content and soil base saturation.KEYWORDS: detailed mapping, pedometrics, accuracy boundaries. DELINEAMENTO DE LIMITES DE PRECISÃO ENTRE ÁREAS COM DIFERETES PADRÕES DE VARIABILIDADE UTILIZANDO SUSCETIBILIDADE MAGNÉTICA E SUPERFÍCIES GEOMÓRFICASRESUMO: Existe uma demanda cada vez maior por mapas detalhados que representem de maneira simplificada o conhecimento da variabilidade de determinada área ou região. O objetivo do trabalho foi delinear limites de precisão entre áreas com diferentes padrões de variabilidade utilizando suscetibilidade magnética e superfícies geomórficas. O trabalho foi realizado em uma área de 110 ha, onde se identificaram três compartimentos de paisagem com base no modelo de superfícies geomórficas. Foram coletadas 514 amostras de solo nas profundidades de 0-0,20 m e 0,60-0,80 m, para a determinação de pH, matéria orgânica, fósforo, potássio e magnésio, areia total e argila. A soma de base, capacidade de troca catiônica e saturação por bases foram calculadas. A suscetibilidade magnética foi avaliada em laboratório, utilizando-se de um método baseado em uma balança de precisão analítica. A identificação das superfícies geomórficas permitiu o reconhecimento de áreas específicas de manejo (locais com máxima homogeneidade dos atributos do solo). O mapa de variabilidade espacial da suscetibilidade magnética pode ser utilizado para validar com precisão os limites entre as superfícies geomórficas identificadas no campo e inferir a variabilidade do teor de argila e saturação por base do solo.

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Section: Methodsmentioning

confidence: 99%

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

et al. 2014

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“…The mass-specific magnetic susceptibility, v, at low field of the samples was measured: (a) with a Bartington MS2 meter equipped with an MS2B sensor at the low frequency (470 Hz) setting (Dearing, 1999); and (b) by using an analytical balance according to Cano et al (2008); Figure 2 illustrates the experimental setup with a small neodymium-iron-boron permanent magnet used as the magnetization source. In this procedure, the change in weight caused by placement of the sample in the holder is negative for paramagnetic, ferromagnetic and ferrimagnetic samples and positive for diamagnetic samples.…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

“…, 2008); some, however, have measured it with a rare‐earth magnet placed on an analytical balance (Jones & Beavers, 1964; Davis, 1992; Carneiro et al. , 2003; Cano et al. , 2008) or with a magnetometer (Fabris et al.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on soil magnetic susceptibility have used ad hoc sensors (Dearing, 1999;Preetz et al, 2008); some, however, have measured it with a rare-earth magnet placed on an analytical balance (Jones & Beavers, 1964;Davis, 1992;Carneiro et al, 2003;Cano et al, 2008) or with a magnetometer (Fabris et al, 1998). The analytical balance method is simple and less expensive than the others.…”

Section: Introductionmentioning

confidence: 99%

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Correlation of properties of Brazilian Haplustalfs with magnetic susceptibility measurements

Siqueira

Marques

Matías

et al. 2010

Soil Use and Management

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Magnetic susceptibility (χ, mass specific) is useful for easy indirect estimation of other soil properties at a low cost. The aim of this study was to assess the use of χ as measured with an analytical balance for predicting properties with a substantial influence on the management of Typic Haplustalfs in southern Brazil. To achieve this 48 topsoil samples were taken at the intersection points in a rectangular grid of 20 m × 20 m cells, with 38 of these used for calibration and 10 for validation in regression analyses. The obtained χ values were slightly higher than, and highly correlated (r = 0.970; P < 0.001) with those measured with a susceptibility meter. Highly significant (P < 0.001) correlations were also found between χ and other soil properties relevant to soil classification and management such as clay content (r = 0.68), cation exchange capacity (r = 0.62), P sorption capacity (r = 0.76) and haematite content (r = 0.82). Results from a principal component analysis of eight properties important for soil classification explained 11% of the variance in the data set. The good predictive ability of χ was consistent with current knowledge on the formation pathways for pedogenic ferrimagnets. In summary, χ, which can be readily measured with an analytical balance, has the potential for quantifying soil attributes and may therefore be used in pedotransfer functions.

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“…Most of the works presented on MS, in the field of soil science, uses its own sensors (BARTINGTON INSTRUMENTS, WITNEY, UK) (DEARING, 1999;PREETZ et al, 2008). Other authors evaluated the MS through the system developed by RANKINE (1934) and improved by DAVIS (1992) using an analytical balance (CARNEIRO et al, 2003;CANO et al, 2008;SIQUEIRA et al, 2010) and magnetometer (FABRIS et al 1998). The advantage of using the analytical balance method is simplicity, allowing its use by researchers and producers of different levels of technical standards.…”

Section: Introductionmentioning

confidence: 99%

Magnetic susceptibility in the prediction of soil attributes in two sugarcane harvesting management systems

et al. 2013

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This study aimed to investigate the potential use of magnetic susceptibility (MS) as pedotransfer function to predict soil attributes under two sugarcane harvesting management systems. For each area of 1 ha (one with green sugarcane mechanized harvesting and other one with burnt sugarcane manual harvesting), 126 soil samples were collected and subjected to laboratory analysis to determine soil physical, chemical and mineralogical attributes and for measuring of MS. Data were submitted to descriptive statistics by calculating the mean and coefficient of variation. In order to compare the means in the different harvesting management systems it was carried out the Tukey test at a significance level of 5%. In order to investigate the correlation of the MS with other soil properties it was made the correlation test and aiming to assess how the MS contributes to the prediction of soil complex attributes it was made the multiple linear regressions. The results demonstrate that MS showed, in both sugarcane harvesting management systems, statistical correlation with chemical, physical and mineralogical soil attributes and it also showed potential to be used as pedotransfer function to predict attributes of the studied oxisol.KEYWORDS: pedotransfer, indirect quantification, oxisol. SUSCETIBILIDADE MAGNÉTICA NA PREDIÇÃO DE ATRIBUTOS DO SOLO EM DOIS SISTEMAS DE MANEJO NA COLHEITA DE CANA DE AÇÚCARRESUMO: O presente trabalho teve como objetivo investigar o potencial de uso da suscetibilidade magnética (SM) como componente da função de pedotransferência para predição de atributos do solo, sob dois sistemas de manejo na colheita de cana-de-açúcar. Para cada uma das duas áreas de 1 ha (uma com colheita mecanizada de cana crua e outra com colheita manual de cana queimada), foram coletadas 126 amostras de solo que foram submetidas às análises de laboratório, para determinação dos atributos físicos, químicos e mineralógicos do solo e para medição da SM. Os dados foram submetidos à estatística descritiva, calculando-se a média e o coeficiente de variação. Para comparar as médias nos diferentes sistemas de manejo, foi realizado o teste de Tukey, ao nível de significância de 5%. Foram realizados o teste de correlação simples para averiguar a correlação da SM com outros atributos do solo e a regressão múltipla linear a fim de avaliar o quanto a SM contribui para a predição de atributos complexos do solo. Os resultados demonstram que a SM apresentou, em ambos os sistemas de manejo de colheita da cana-de-açúcar, correlação estatística com atributos químicos, físicos e mineralógicos do solo e apresentou potencial para ser utilizada como componente da função de pedotransferência para predição de atributos do Latossolo estudado. PALAVRAS-CHAVE:pedotransferência, quantificação indireta, Latossolo.

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Understanding the magnetic susceptibility measurements by using an analytical scale

Cited by 23 publications

References 9 publications

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

Correlation of properties of Brazilian Haplustalfs with magnetic susceptibility measurements

Magnetic susceptibility in the prediction of soil attributes in two sugarcane harvesting management systems

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