ANALYTICAL PROCEDURE CONSOLIDATION FOR THE TOTAL PHOSPHORUS QUANTIFICATION IN WATER BODIES
Impact for the Water Resources Management
Keywords:
Acid Digestion, Methodology, Information QualityAbstract
Understanding the phosphorus dynamics in the ecosystem and its correct and accurate quantification is fundamental for proper decision making in water resources management. Thus, the aim of this study was to evaluate the best analytical method for quantifying phosphorus using three distinct acid digestion methodologies for total phosphorus extraction. The study areas were the Barigui and Passaúna Rivers which have different land use and soil occupation, as well as water uses. The results showed that all proposed methods have good reproducibility with R² greater than 0.98, for low and high concentrations. However, in the samples quantification, method 2 presented the most satisfactory results, in which the smaller sample volume and reagents used, shorter digestion time and good precision and reproducibility of P concentration of the samples stand out. Improper use of an analytical procedure or calibration curve may underestimate the quantification of P in samples with low concentrations by about 70%, highlighting the importance of good experimental design and concern for the quality of the information generated.
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