Dear Najmin
Please kindly follow the attached instruction for your work!
Good Luck
Hi Dr Najmin Ahmed . Freshly reagents are better always because the prepared regrant have expired dates and some of them affect by light and temperature. Also each prepared reagent has its own expired date different from other prepared reagents. To be in a safe side , I advice to have fresh reagents always. Thank you.
Check https://www.watereducation.org/sites/main/files/file-attachments/pennsylvania_department_of_environmental_protection_biochemical_oxygen_demand.doc
Check https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/755569/COD-215nov.pdf
Check on the notes below.
https://www.watereducation.org/sites/main/files/file-attachments/pennsylvania_department_of_environmental_protection_biochemical_oxygen_demand.doc
Dear Najmin,
just in case that your technical question is still of interest to you, I think it is almost impossible to give you a general answer. It depends very much on the stability of the individual reagents. Some reagnents need to be freshly prepared, while others may be stable for years (such as ammonia solution). For a good overview of the chemistry involved here, please have a look at the following very useful article:
The Science of CHEMICAL OXYGEN DEMAND
This booklet is freely available as public full text (please see attached pdf file). I hope it helps. Good luck with your research and best wishes!
Dear Najmin Ahmed . Reagents have expired date . Therefore, it is better to use fresh ones. But generally you can store them at low temperature and far away from light.
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