I am confused on how the sand content is calculated in aggregate size fractions separated by wet sieving, especially when the fractions are to be used for further analysis. If they are to be dispersed later on and analyzed for carbon content, is the correct approach to subtract whatever was determined to be carbon in the fraction from the total weight of the fraction and that will give you the sand content of that fraction?
Sometimes the literature is vague and just states that the sand contents were determined for each fraction and that the final aggregate weights were corrected, and then provides a formula (in some cases) but do not exactly state how the sand weight was determined. Was it determined by texture analysis? Was it calculated post carbon analysis? Was it done by dispersion of a sub-sample?
Dear friend Valeria Izeppi
Determining the sand content in soil aggregate fractions after wet sieving involves a meticulous approach to ensure accurate results, especially when these fractions are intended for further analysis.
To calculate the sand content of a fraction, subtracting the determined carbon content from the total weight of the fraction is not typically the correct approach. Instead, sand content is usually determined directly through methods specific to soil analysis.
One common method involves texture analysis, where the soil sample is dispersed and separated into different particle size fractions using sieves. The sand fraction, typically consisting of particles with diameters between 0.05 mm and 2 mm, is collected and weighed separately.
In some cases, determining sand content may involve post-carbon analysis adjustments, but this depends on the specific protocol followed. However, it's essential to ensure that the method used is well-documented and follows established procedures to maintain accuracy and consistency.
Literature on soil analysis may sometimes lack specific details on how sand content was determined for each fraction. In such cases, it's beneficial to refer to established methodologies or consult with experts in the field for clarification.
In summary, determining sand content in soil aggregate fractions after wet sieving involves a combination of sieving, weighing, and possibly additional analyses, with the specific method chosen based on the requirements of the study and established protocols in soil science.
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