Patent ID: 8012755

Claim:
A water quality evaluation method, comprising: providing a substrate contacting apparatus; performing a sealing performance evaluation of the substrate contacting apparatus by connecting the substrate contacting apparatus to a vacuum pump, creating a pressure drop in the substrate contacting apparatus with the vacuum pump, measuring an interior pressure of the substrate contacting apparatus when the pressure drop in the substrate contacting apparatus substantially stops, and calculating a difference between the interior pressure of the substrate contacting apparatus and atmospheric pressure; accommodating the substrate in the substrate contacting apparatus when the calculated pressure difference is lower than or equal to −0.094 MPa; feeding water to be evaluated into the substrate contacting apparatus to contact the substrate; sealing the substrate in the substrate contacting apparatus; transporting the substrate contacting apparatus with the substrate accommodated therein to an analysis device; taking the substrate out of the substrate contacting apparatus; and determining a substrate surface state to evaluate water quality.