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Low Phosphorus Analytical Measurement Study (Electronic book text)
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Low Phosphorus Analytical Measurement Study (Electronic book text)
Series: WERF Research Report Series
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Available as eBook only. Phosphorus measurements at very low
concentrations have been tested and proven to be unreliable. The
establishment of stricter phosphorus discharge requirements has
challenged the wastewater facilities to be capable of measuring low
phosphorus concentrations (20 g/L) in the effluent. The major
challenge associated with low phosphorus measurements seems to be
related to the sample matrix and the digestion methodologies. The
results of total phosphorus measurements in wastewater effluent,
high quality deionized water samples, and orthophosphate
measurements in wastewater effluent samples show a broad
variability. In contrast, the orthophosphate measurements in the
deionized water matrix spiked to 3 g/L and 6 g/L show an
insignificant variability. The Ascorbic Acid Method seems to be a
reliable technique to measure orthophosphate at low levels. The
findings of the current study have demonstrated that as the
phosphorus concentration increases, the variability decreases. A
good reliable analytical process is needed to provide information
to regulators for setting sound permit limits and by utilities
required to meet those limits. Current methods show significant
variability at very low (<20 g/L) concentrations when measuring
total phosphorus and orthophosphate. This study provides important
information regarding the capability of wastewater and commercial
laboratories to determine low phosphorus concentration (0-20 g/L)
accurately. The findings of this study raises some important
questions regarding establishing permit limits and the ability of
utilities to comply with the limits. Measurements to comply with
very low limits (<20 g/L TP) will inherently vary, making it
impossible to determine both the environmental impact of the
discharge stream and the performance of the utility.
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