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KMID : 0903520060490020153
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2006 Volume.49 No. 2 p.153 ~ p.157
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Accuracy and Precision of Spectrophotometric Measurement of Clay Content in Soils
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Park Soon-Nam
Kim Kye-Hun
Kang Ji-Young
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Abstract
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Accuracy and precision of the spectrophotometeric analysis of clay content in soils were estimated by comparison with the conventional pipet method. Clay contents in 25 soil samples of various physico-chemical properties including texture were determined by spectrophotometry and pipet methods, and the two sets of data an clay content were compared by several statistical analyses. The correlation between clay contents determined by spectrophotometry and pipet methods was highly significant. The regression coefficient was 0.98** and the slope of regression equation was close to 1.0. The standard deviation and CV of clay contents measured by spectorphotometry were smaller than those found in the data of clay contents obtained by pipet method. In conclusion, compared to the conventional pipet method, spectrophotometry was a rapid, convenient, accurate and precise method for the measurement of clay content in soils.
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KEYWORD
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spectrophotometry, pipet method, clay content
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