I'm developing a material to remove ammonia from water samples, and I'm wondering what would the best parameter to measure ammonia concentration by? I'm following EPA Method 349.0 for preparation of my stock solution which I've cited here:
" 7.1.2 Stock Ammonium Sulfate Solution (100 mg N/L) - Quantitatively transfer 0.4721 g of pre-dried (105 C for 2 o hours) ammonium sulfate ((NH4 ) 2SO4 , FW 132.15) to a 1000 mL glass volumetric flask containing approximately 800 mL of reagent water and dissolve the salt."
I believe this solution has a concentration of 100 mg/L NH4-N. I have seen that I should be accounting for the mass of Nitrogen from both NH3 and NH4. So my question is- how do I account for nitrogen contributed by NH3? Is there a calculation I can perform based on pH or will I need to actually measure this? I am performing spectrophotometric determination at 640 nm which the EPA method describes as " linearly proportional to the concentration of ammonia".
Dear Chapman,
Following links will helpful you to determine the ammonium concentration in water samples and its conversion.
https://www.jstor.org/stable/25037839?seq=1#metadata_info_tab_contents
https://www.merckmillipore.com/INTERSHOP/web/WFS/Merck-JP-Site/ja_JP/-/JPY/ShowDocument-Pronet?id=18675
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