The present invention provides a method of analyzing multiple samples
simultaneously by absorption detection. The method comprises: (i)
providing a planar array of multiple containers, each of which contains a
sample comprising at least one absorbing species, (ii) irradiating the
planar array of multiple containers with a light source and (iii)
detecting absorption of light with a detetion means that is in line with
the light source at a distance of at leaat about 10 times a
cross-sectional distance of a container in the planar array of multiple
containers. The absorption of light by a sample indicates the presence of
an absorbing species in it. The method can further comprise: (iv)
measuring the amount of absorption of light detected in (iii) indicating
the amount of the absorbing species in the sample. Also provided by the
present invention is a system for use in the abov metho.The system
comprises; (i) a light source comrnpising or consisting essentially of at
leaat one wavelength of light, the absorption of which is to be detected,
(ii) a planar array of multiple containers, and (iii) a detection means
that is in line with the light source and is positioned in line with and
parallel to the planar array of multiple contiainers at a distance of at
least about 10 times a cross-sectional distance of a container.
