Determination of total phosphorus in circulating water and boiler water - spectrophotometric method
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Regarding the detection of total inorganic phosphorus: According to the national standard GB/T 6913-2008, after degradation with sulfuric acid, ammonium molybdate and ascorbic acid are added directly. Industrial water treatment technology (Zhou Benxing): After degradation, phenolphthalein indicator and sodium hydroxide are used to adjust the pH, followed by the addition of ammonium molybdate and ascorbic acid. Regarding the detection of total phosphorus: According to the national standard GB/T 6913-2008, sulfuric acid and persulfate are used for degradation; thereafter, sodium hydroxide is added to adjust the pH, followed by the addition of ammonium molybdate and ascorbic acid. Industrial water treatment technology (Zhou Benxing): After the degradation of sulfuric acid and persulfates, ammonium molybdate and ascorbic acid are added directly. These two are exactly opposite to each other. I wonder if the measurement of phosphate absorbance is related to pH? Which of these two is correct?
Regarding the issues of *ao acid silver standardization and chloride detection: The endpoint is defined as when a brick-red color appears, which is too vague! Thank you!