Patent ID: 7670558

Claim:
A chemical analysis apparatus comprising an analysis tank and a reaction container in which a sample to be analyzed and a liquid are placed, and sound waves are irradiated to said reaction container so as to agitate said sample and said liquid, said reaction container being positioned within said analysis tank, wherein said chemical analysis apparatus further comprises a piezoelectric element producing said sound waves, drivers for electrically driving said piezoelectric element to produce said sound waves, a slanted sound wave reflecting means disposed on an internal wall of said analysis tank, opposite to said piezoelectric element with respect to said reaction container, and an optical analyzing unit, where said piezoelectric element is configured to produce sound waves which include a sound wave irradiated to a liquid surface of the liquid including the sample to be analyzed, laterally of said reaction container, and said slanted sound wave reflecting means is configured to produce a reflected sound wave propagated in a direction below said sound wave and toward a position where no liquid surface is presented, by reflecting said sound wave transmitted through the reaction container by said slanting reflecting means, in the direction below said sound wave, so as to introduce said reflected sound wave again into the reaction container, wherein said sound wave and said reflected sound wave are of a frequency producing an acoustic radiation pressure dominant in a vicinity of a liquid interface of the liquid at the reaction container to induce a circulation flow of said liquid and said sample in said reaction container.