Maybe colour of liquid compared to distilled water/plain iron water.
Qn example: Dissolved tannins give water a brown hue.
Yes, it can. You need to go to the spectrometer page for more information. It will show how to set up cuvette s to hold water and what to use as a light source. Then you need to go to the spectrometry page. You will need to learn to use spectralworkbench, but there are many examples of different colored water samples in the library. There are help videos showing how to use the software.
The old way to learn color was Roy G. Biv ( red orange yellow green blue indigo violet). You can see this in the picture taken by the diffraction grating. But it will be a good way to teach. Sorry for the delay answering.
Thanks for your helpful answers
Try to avoid using blue water solutions, at least without doing some testing. The compact florescent lamps (CFL) loose intensity at the blue and of the spectrum. The cfls are one lamp often used with the cuvettes for water testing. The intensity lose could be a problem.
Depending on what information is needed from the spectrum (i.e. like the entire available spectrum, using a CLF will not be useful. A broadband source, such as Solux 4700K, would be a better choice.
If you used the right lamp, you would be ok. You need to use a broadband source, as stoft noted.
Do you know what APHA values you will be observing? I was typically observing values under 25. And yes, a florescent light was very helpful against a white background, if doing the test visually.
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Thanks for your answer, I have the standard solution of 5-10-20..70 pt / cb (I borrowed), according to the standard method, when measured at 430nm, i observed its Abs too low (0.0004 - 0.0016 ...)
I have no solution for multi-wavelength source like a spectrometer. I will try with another wavelength.
We always went with the longest path length. The visual test was done with 50 cm color comparison tubes. Very long for visual. Maybe you could do something similar with the spectrometer. Good luck!
sorry for saying it is unclear, with wastewater, the color of the water partly assesses the level of water pollution.
Pollution comes in many forms and many of the worst contaminants will not alter the appearance so visible light spectrometers (i.e. PLab types) will not detect those chemicals. Measuring water conductivity and pH might provide a simpler and more sensitive measure. Note, none of these simple methods provides detection of specific contaminants or detection of contaminants which are toxic at very small concentrations.