Polyvinyl alcohol (PVA) transparency can be determined by optical measurement. Specific steps are as follows:
Prepare a certain concentration of PVA solution.
Measure the absorbance of the sample using a spectrometer or photometer. Light with a transparency of 450 nm can be selected for measurement.
Mix the sample with pure water to reduce the concentration of the sample until its absorbance falls within the measurement range. The ratio of each dilution can be recorded.
Calculate PVA transparency using the following formula:
Transparency (%) = 1 - Absorbance (Sample) / Absorbance (Control)
Wherein, "control" can be pure water or other samples without PVA.
