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Abstract
In the present investigation, the validation of the gravimetric method was carried out to determine the total suspended solids dried at 103-105 ° C
in natural and residual waters. This process is fundamental in laboratories certified according to ISO / IEC 17025 and allows to obtain reliable
data, for this work was developed taking as a reference the method of section 2540 D proposed by the standard method edition 23, for the determination of total suspended solids. In this particular case, the method consisted of filtering a well-mixed sample through a previously weighed standard fiberglass filter, and then drying the filter and the residue retained therein at a constant weight in a 103-well oven. 105 ° C. The increase in filter weight represents the total suspended solids. The results for this method are reliable due to the fact that error percentages and coefficients of variation were lower than 10%, which shows that this analysis was performed with good accuracy and precision, with a limit of detection of 11,010 mg SST / L, showing that a good process was performed in the determination of total suspended solids. The validation carried out in this work shows that the methodologies used meet the criteria required before the control entities such as IDEAM, which allow us to guarantee that the above results are highly reliable in the Research and Environmental Quality laboratory of the SENA Regional Córdoba and in turn is a support to maintain accreditation under resolution 0477 of May 15, 2019, retaining the guidelines of the aforementioned standard.
