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Results tagged with analytical-chemistry
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user 68520
The branch of chemistry concerned with identifying and quantifying the chemical constituents of matter.
1
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Accelerated stability testing for chemicals: Shelf life / Expiry Date
Yes, there are guidelines. For example from ICH and WHO for pharma, and from CIPAC for pesticides. Some can be downloaded freely.
Yes, there are guidelines. For example, from ICH and WHO for Pharma, …
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0
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Identifying food, quick and cheap?
Unfortunately, your confidence in what a chemist can, is quite exaggerated. Though flattering.
Analyzing the entire range of parameters that you list, requires several analytical techniques, includin …
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1
vote
Determining the hydrogen peroxide content in acetic acid
When you ask for a precision of 0.1 ppm, I assume you actually mean the detection limit?
A very common method for quantitative analysis of peroxide content is iodometric titration: the peroxides reac …
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0
votes
Converting chlorine dioxide concentration to chlorine for the water quality report
Be aware: I think you are talking about two different things when you say “chlorine”!
The molecular weight of 35.45 g/mol that Hunter uses refers to a single chloride atom or ion. But usually when t …
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0
votes
what is the exact meaning of oxidation state?
Oxidation state is a formal number ascribed to atoms, to tell if it has more or less electrons than in its natural state.
For single atoms it is fairly straightforward, as electrons can only be remov …
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6
votes
Accepted
When making a calibration curve, do we have to use the wavelength at maximum absorbance?
No it doesn’t. Measurements can in principle be made at any wavelength.
If there are two colored specimens in the same solution, it is actually better to measure at the wavelength where the differenc …
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