A method of measuring a sample solution concentration and apparatus for measuring a sample solution concentration

A method for measuring the urea concentration, the method comprising determining the urea concentration of urea-containing sample solution by measuring the intensity of emitted in a reaction vessel chemiluminescence the reaction vessel through connecting in series of three or more reaction vessels having a mouth and an outlet via straight passages is formed, wherein the reaction vessel comprises at least one reaction vessel in which α is an angle at which an axis of the orifice and an axis of the outlet cross is 15 ° or more and 165 ° or less, a cross-section ratio (S1 / S2) between a cross-section (S1) of each reaction vessel and a cross section (S2) of the mouth of three or more, the method comprising: introducing the urea-containing sample solution and a hypohalous acid ion-containing Reaktantenreagenz solution to a first reaction container from the mouth of the first reaction vessel, producing a turbulent stream in the first reaction vessel by producing a jet stream with the introduced solutions while mixing the sample solution and Reaktantenreagenz the solution; introducing a first mixed solution obtained to a second reaction container from the mouth of the second reaction vessel via the outlet of the first reaction vessel; ...