Analysis of organic phosphorus in circulating water
Thread Content
What method is used to analyze organic phosphorus in circulating water? Is it equal to total phosphorus minus total inorganic phosphorus?
What method is used to analyze organic phosphorus in circulating water? Is it equal to total phosphorus minus total inorganic phosphorus?
Check below: http://bbs.hcbbs.com/thread-50011-1-7.html
Determination of total phosphorus in water – Ammonium molybdate spectrophotometric method GB11893—89
The detection of organophosphorus compounds can be carried out using a FPD-equipped detector specific for phosphorus compounds. 1. Concentrate the water 100 times under negative pressure using a rotary evaporator. 2. Take 5 ml of the concentrated water sample, add anhydrous sodium sulfate to convert the water into sodium sulfate decahydrate, and then use 10 ml of trichloromethane to extract the organic substances after the water has been removed. 3. Conduct the detection using an FPD detector equipped with a phosphorus filter. The total phosphorus content can be determined by combining this method with the total phosphorus detection method provided by the forum moderator; the final results can only be obtained after the analysis is completed
There are analysis methods for total phosphorus and total inorganic phosphorus. Is there a national standard for analyzing organic phosphorus? Is the formula organic phosphorus = total phosphorus – total inorganic phosphorus correct? Thank you. This post was last edited by Sandstorm333 on 2009-2-7 at 11:25
I haven’t checked whether there are any relevant national standards, but the method I provide was invented by me. It should work well for detecting organophosphorus compounds, as inorganic phosphorus does not move along with the mobile phase in gas chromatography. Therefore, my conclusion is that if the measurements of total phosphorus and inorganic phosphorus are accurate, then your inference is valid. You’ll need to wait for your analysis results to confirm this
Thank you for the help! Daily operation control parameters for circulating cooling water Analysis items Control parameters Analysis frequency Total phosphorus – Orthophosphorus (organic phosphines): 5.0~7.0 ppm, 2 times per shift. However, after reading this, I have a question regarding total phosphorus – orthophosphorus (organic phosphines): does this mean that orthophosphorus is equivalent to organic phosphines, or is it true that organic phosphines = total phosphorus – orthophosphorus?
Thank you. For the determination of total phosphorus and total inorganic phosphorus, our factory uses the ammonium molybdate spectrophotometric method as specified in GB11893—89; we have been using this method for many years now, and it provides accurate results. However, there is controversy regarding whether organic phosphorus is equal to total phosphorus minus total inorganic phosphorus. Because our factory’s circulating water is currently controlled using a low-phosphorus approach, with organic phosphorus analysis being used to regulate the dosage of chemicals added.
The conventional testing methods measure total phosphorus, which includes organic phosphorus, inorganic phosphorus, and phosphorous acid. In circulating water, the amount of phosphorous acid is very small and can be ignored; therefore, it can be said to be the sum of organic phosphorus and inorganic phosphorus
As a supplementary note, in circulating water, the chemical used is generally organophosphorus; therefore, we consider the total phosphorus amount to be equivalent to the amount of organophosphorus
Generally, total phosphorus minus orthophosphorus equals organic phosphorus! Just measure the total phosphorus, and the positive phosphorus as well!