Cuvette for analysis of liquids

A cuvette for analysis of liquids, comprising:

• a first cuvette portion and a second cuvette portion, which are joined to each other, the first cuvette portion having a first recess, a first through hole and a second through hole, the second cuvette portion having a second recess, the first recess recessed in a direction from an internal surface of the first cuvette portion to an external surface thereof, the first recess open toward the second cuvette portion, the second recess recessed in a direction from an internal surface of the second cuvette portion to an external surface thereof, the second recess open toward the first cuvette portion, the first recess and the second recess confining a space therebetween forming a cuvette cavity, an inlet passage and an outlet passage, which are in communication with one another, the first through hole extending through the first cuvette portion in a thickness direction of the first cuvette portion and coming into communication with the inlet passage, the second through hole extending through the first cuvette portion in the thickness direction of the first cuvette portion and coming into communication with the outlet passage,
• a first passage port from the inlet passage to the cuvette cavity and a second passage port from the cuvette cavity to the outlet passage disposed respectively on opposite sides of a line connecting the first through hole to a center of the cuvette cavity,
• wherein a backflow edge of the cuvette cavity is provided thereat with an elongate groove, which is a groove disposed in a bottom surface of the second recess and extends along a lengthwise direction of a side wall of the cuvette cavity, the elongate groove having a cross-section, which is arc-shaped and tangent to a side wall of the second recess;
• and
• the outlet passage is provided therein with a first baffle block and a second baffle block, which project inwardly from inner walls of the outlet passage respectively in two opposite directions and block part of a path within the outlet passage, thereby forming a labyrinth-like sealing structure.