System for Liquid Chromatograph with Compressibility and Viscosity Monitoring to Identify Fluids

A liquid chromatography system comprising:

• (a) a mixing valve system or apparatus having an output port and a plurality of input ports thereof, each of the plurality of input ports fluidically coupled to a respective fluid-providing sub-system, each fluid-providing sub-system comprising:
• (i) a valve comprising a common port and a plurality of other ports, configurable such that the common port may be fluidically coupled to any one of the other ports;
• (ii) a pump fluidically coupled to the common port of the valve;
• (iii) a plugged first one of said other ports of the valve;
• (iv) a solvent or reagent container containing a solvent or reagent, said solvent or reagent container fluidically coupled to a second one of said other ports of the valve;
• (v) a fluid tubing line having a known resistance to fluid flow and having a first end that is fluidically coupled to a third one of said other ports of the valve and a second end that is fluidically coupled to a waste container;
• (vi) a pressure gauge configured to measure fluid pressure within the pump;
• and
• (vii) a fourth one of said other ports fluidically coupled to the mixing valve system or apparatus;
• (b) a chromatograph column having a first end fluidically coupled to the output of the mixing valve system or apparatus and a second end;
• and
• (c) a detector fluidically coupled to the second end of the chromatograph column.