Fig. 3From: Linking biological toxicity and the spectral characteristics of contamination in seriously polluted urban riversSpectral characteristics of a florescence index (FI), b biological index (BIX), c humification index (HIX), and d specific ultraviolet absorbance at 254 nm (SUVA254) for the surface water (SW), sediment pore water (SDPW), and soil pore water (SPW) along the Qingshui Stream longitudinal gradientsBack to article page