A study on a path-length amplification correction factor by a transmittance-reflectance method

A transmittance-reflectance(T-R)method is one of the most important methods to measure the absorption coefficient of suspended particulate matter. The GF/F filter paper's hydration degree and the path-length amplification correction factor model play the key roles in the T-R method. The effect of the hydration degree of the GF/F filter paper on the optical properties was experimentally analyzed. The results show that the error of transmittance ratio, reflectances ratio and reflectance of the filter paper which is soaked 60~80 min, is the minimum, and their values are 3.0%, 0.5% and 0.5%. On this basis chlorella were used as a research object, the path-length amplification correction factor model of the T-R method was studied. The results show that a polynomial regression model is superior to a linear regression model and a power regression model; and a quadratic polynomial model is selected as the path-length amplification correction factor model of the T-R method. The regression interval is , and the average relative error is 9.19%.