Abstract: A method for titration flow injection analysis by introducing a multicomponent sample into a carrier stream which flows into a mixing/sensing cell and titrating with a reactant more than one component of the sample by sensing a plurality of endpoints. The apparatus of the invention includes a stirring means within the mixing/sensing cell which generates helical flow within the cell so that bubbles are not retained in the cell.

Abstract: A method for titration flow injection analysis by introducing a multicomponent sample into a carrier stream which flows into a mixing/sensing cell and titrating with a reactant more than one component of the sample by sensing a plurality of endpoints. The apparatus of the invention includes a stirring means within the mixing/sensing cell which generates helical flow within the cell so that bubbles are not retained in the cell.

Abstract: An apparatus is provided for predicting the extrusion performance of a thermoplastic resinous polymer, which includes at least three and preferably four capillaries arranged in series with each successive capillary having a larger passageway than that of the immediately preceding capillary and with each capillary having substantially the same ratio of passageway length to cross-sectional area. The apparatus also includes a pump for forcing a heated polymer melt through the capillaries at a constant volumetric flow rate, a sensor for measuring the temperature of the polymer melt, a sensor for measuring the pressure drop of the polymer across each capillary, and a combination recorder and processor for determining the polymer viscosity in each capillary (different shear rates), whereby the extrusion performance of the polymer can be predicted. A method for predicting extrusion performance of a thermoplastic resinous utilizing these polymer capillaries is also provided.