nitrogen: phosphorus: potassium fertilizers as a inorganic compound. I indeed have been measured the nutrients concentration in freshwater. But now is there methods to measure them as compound?
Dear Sara,
The River and Stream Water Quality Monitoring collects water samples from stream. The sample collects data for dissolved oxygen, temperature, pH, and conductivity in many rivers and streams. For Nitrogen Kjeldahl method is the popular method. The nitrate level in freshwater is usually found in the range of 0.1 to 4 mg/L NO3 – -N. Unpolluted waters generally have nitrate levels below 1 mg/L. The effluent of some sewage treatment plants may have levels in excess of 20 mg/L. The Phosphorus is the form of P2O5 , phosphorus normally occurs in the fifth oxidation level, that means as phosphate or deriving compounds. And K is found as K2O.
Different analysis methods are used to analyse NPK, please find attached herewith related articles.
Regards,
Prem Baboo
https://www.researchgate.net/post/Method_of_analyzing_total_nitrogen_in_urea_sample?_tpcectx=profile_answers
Dear Dr. Prem Baboo,
Thank you for your answer and your attached articles. These measurements only enough regardless of the proportion of N:P:K fertilizers that I used in laboratory. Since I used different proportion like 20:20:20, 20:5:20 and 5:20:20 . And I evaluate their toxicity to some freshwater organisms. And I want Achieve the environmental or observed concentrations.
Best regards,
Sara
Sara,when we apply fertilizers and manures to field crops,over years their residues in soluble form accumulate in soil.Through leaching they reach ground water and through erosion and run off reach nearby surface water bodies like ponds and tanks.The soluble nitrogen forms are ammonium,nitrate and traces of nitrite.The soluble P forms are HPO4 and H2PO4. Potassium is in K plus ion form.Both N and P ionic forms can be estimated colorimetrically using visible spectro-photomter and K by flame photometer or atomic absorption spectro-photometer .The following reference will provide details of methods used for water analysis.You can find several other manuals on line in pdf form
Guide manual:water and waste water analysis-Central Pollution Control Board
cpcb.nic.in>upload>newitem>Newitem_171_guidemanualw&wwan
- Badges
- Science topic
- Similar topics
- Engineering
- Chemical Engineering
- Membranes