Patent ID: 6028663
Filing Date: 2000-02-22
Classification: G01N

Abstract:
A photometric analysis method for water suspensions of a type comprising measuring spectrum heights of absorbance of a sample at a predetermined wavelength to obtain an estimate of the content of the suspensions, comprising the steps of:passing light from a light source through an unconcentrated solution of the water;isolating non-absorbed and non-back scattered light;obtaining a full spectrum record of light transmitted, a measure of absorption and back scatter;identifying a distinctive pigment absorption peak for chlorophyll;measuring the height of the chlorophyll pigment peak detected;identifying accessory pigments;reducing the height of the chlorophyll pigment peak by the estimated accessory pigment spectrum height at a wavelength of the chlorophyll pigment peak; andobtaining an estimate of chlorophyll concentration from the reduced chlorophyll pigment peak.