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### Increasing concentration of acetylcholine via SPE

I am trying to increase the final yield of acetylcholine (ACh) in my biofluid samples. I need to get the yield high enough for high confidence annotation of ACh (currently all I can really say is that ...
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### How can I make rose water with rose oil? [on hold]

I want to make rose water with natural Rose essential oil, please let me know how I can mix this oil with water to be homogeneous solution. The mix will be 1 oil to 1000 water. Thanks. Vahid
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### What is the equation for solving the concentration of the unknown from a Single-point Standard Addition Calibration for Potentiometry?

I know how to use the standard addition equation for a single-point analysis from an equation I got from the Analytical Chemistry book "Quantitative Chemical Analysis" 9ed by D. Harris. However, ...
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