An Estimation Technique of Water Pollution with Transparency Ratio 

Takahiro ITO, Masaru MIZOGUCHI 
Faculty of Bioresources, Mie University 

Abstract 

It is difficult to estimate water pollution objectively with 
transparency because the transparency is affected sensitively by 
the subjectivity of an observer and sunshine in an observing place. 
However the transparency ratio, which is here defined as a ratio of 
the transparencies of each sample measured on the same condition,
can be an objective standard for estimating turbidity. In the present 
paper, the concept of transparency ratio is derived from the Beer-
Lambert's law and the validity of the transparency ratio is verified 
by field data. Geometrical calculation for the intensity of incident 
ray through a transparency apparatus brought a practical table for 
modifying transparency and led to the conclusion that the modified 
transparency should be used to obtain the transparency ratio for 
turbid water. 

Key words : 
water pollution, transparency, transparency ratio, turbidity