鄂东南湖泊水体中颗粒态黑碳分布特征与来源分析-以磁湖为例

Particulate black carbon (PBC) is an important component of particulate organic carbon (POC) in the Earth’s aquatic ecosystem. The concentration levels, spatial distribution characteristics, and possible sources of POC, PBC, and their components (char and soot) in Cihu Lake of Huangshi City were investigated by using the thermal optical reflectance (TOR) method. The results showed that the concentrations of POC, PBC, char, and soot in the water bodies of Cihu Lake varied in the ranges of 2899.38- 5622.80, 235.01 -800.08, 24.41 -310.23, and 130.09 -544.72 μg·L⁻¹, respectively, with a mean of 3903.84, 377.25, 155.52, 272.65 μg·L⁻¹, respectively, showing significant spatial differences. PBC/POC ranged from 6.89% to 18.32%, with an average value of 10.92%, indicating that the contribution of PBC to the accumulation of POC in Cihu Lake is greater. soot/PBC varied from 45.92% to 89.61%, with a mean value of 63.95%. The spatial variability of PBC, char, and soot concentration and PBC/POC ratio was related to the road traffic and industrial layout in the surrounding area of the lake, and the southern half of the lake was more influenced by traffic pollution and industrial discharge. PBC was positively correlated with POC, char, and soot content, and the correlation coefficient of PBC and soot (r=0.81, P<0.01) was higher than that of char (r=0.72, P<0.01), indicating that soot contributed more to PBC in Cihu Lake. The results of char/soot ratio analysis showed that PBC in the water body of Cihu Lake was mainly influenced by human activities such as traffic pollution and coal combustion.