Distribution, Source and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Overlying Water during Flood Seasons from the Yellow River Delta, China
As one of the richest biodiversity zones in the world, the Yellow River Delta of China receives increasing attention for its ecological and environmental conditions. However, few studies on polycyclic aromatic hydrocarbons (PAHs) in overlying water have been reported for this area. It will have great significance to understand the distribution, source and ecological risk of PAHs in overlying water for the management of the water environment and the protection of aquatic life in the Yellow River Delta. In this study, the PAHs concentrations of 37 sample sites were measured by GC-MS method. The sources of PAHs were analysed by PAH diagnostic ratios and risk assessment was done by joint probability curves. The results indicated that the total concentrations of∑PAHs in the overlying water from the Yellow River Delta ranged from 0.05 to 4.05 μg·L-1 with a mean value of 0.59 μg·L-1, which has no significant differences from that in the Yellow River Estuary water (P=0.567). According to a Shapiro-Wilk test (P=0.993), the concentrations of ∑PAHs were log-normal distributed. Naphthalene had the highest density in the 12 detected PAHs, ranged from 0 to 2.95 μg·L-1. ∑PAHs were predominated by two- and three-ring PAHs and no 6-ring PAHs were detected. The source analysis of the samples from 37 sites indicated that 17 sample sites were polluted bypetroleum, 14 sample sites were polluted by combustion of grass, wood and coal, 6 sample sites were polluted by combustion of petroleum. Risk quotient of each PAH was lower than 1. The joint probability curves of combined PAHs shown that the probability for affecting 5% of species was 0.0082%. The results shown that the concentrations of PAHs were low; the PAHs mainly came from petroleum, followed by combustion of grass, wood and coal;there was no ecological risk of PAHs, and the joint risk of ∑PAHs was low in overlying water during flood seasons from the Yellow River Delta, China.
Yellow River deltaoverlying waterpolycyclic aromatic hydrocarbonsecological risk
国家科技期刊平台
NSTL
万方数据
维普
