How is the Qualitative analysis technique used in science?

Refering to Cations being found in river water, Also who else uses it and why,how e.t.c. needed by Tuesday

Answers:
It's analysis done qualitatively.
There are a number of techniques for determination of cations in a matrix such as river water. There is no one technique that I know of called the "qualitative analysis technique", that phrase refers to knowing what kinds of analytes are in a particular sample. A wide variety of methodologies are suitable for qualitative determination of cations in river water, probably one of the better ones would be ion chromatography with a conductance detector. This type of data is important to a number of different agencies, particularly the EPA and municipal waterworks, etc.
Your homework, yeah? try ask it on the link below. Search in "analytical chemistry". Good luck.
Qualitative analysis is not a technique, it is a method to specify the kind of elements , compounds , ions in a sample, and there are many techinques used to do that, instrumantly or manually (wet chemistry)
Basically it's a technique to find out what there. Forensics also uses it to determine the presence of toxins
Any one who tests the purities of substances; food nutritionists, environmental analysts (e.g. air and water purity).

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