Explain how standard solutions and titrations are done in industry? any one know?

A titration is a measurement to determine a concentration. Those can be done offline (meaning they take a sample and then do the titration in a lab - exactly the same as you do it). It can also be done online (meaning that the titration is automatic and takes the sample automatically and continuously - see also this link to a commercial website that sells them (note: I have no personal interest in that website - this isn't spam)).

 

Often however, the concentrations of materials are determined in a different way (pH, gas chromatography, hplc, etc)... and if a factory is simple, then a good design means that there is no need to do too many checks. Quality control at the end of the production line is sufficient then.

 

Standard solutions are just a matter of blending stuff. What's the problem?

They mix it. Check it to the standard. Correct it. Check it again... repeat until the solution is within specifications.