黄河口附近海域化学需氧量和石油烃分布及其关键控制环境因子分析

于2009年12月、2010年5月、2011年9月、2013年5月和2014年10月,在黄河口附近海域进行了5个航次调查,研究了该海域的化学需氧量(COD)和石油烃的分布情况以及季节变化。结果表明,COD整体呈冬季低、春季高的趋势,而石油烃无明显季节变化趋势。平面分布上,春季和秋季COD高值主要分布在靠近黄河口海域。春季和冬季石油烃高值主要位于调查海域的东北部区域。相关分析结果表明盐度、温度、pH、悬浮物、溶解氧及磷酸盐是影响COD的主要环境因素,而石油烃主要受盐度、温度、pH、无机氮、磷酸盐的影响。进一步多元回归分析结果表明,pH、盐度和溶解氧是影响COD的关键因子,温度是影响石油烃的关键因子。

Distribution and key controlling environmental factors of COD and petroleum hydrocarbon in the adjacent sea of Yellow River Estuary

Temporal and spatial distribution of Chemical Oxygen Demand (COD) and petroleum hydrocarbon concentrations were studied based on data from five oceanographic surveys carried out in the adjacent sea of Yellow River Estuary in December 2005, May 2010, September 2011, May 2013 and October 2014. The results showed that the value of COD was lowest in winter and highest in spring. The average petroleum hydrocarbon concentration in surface water did not show a significant seasonal variation. High concentrations of COD in surface water were detected in the area near the adjacent sea of Yellow River Estuary in spring and autumn. High concentrations of petroleum hydrocarbon in surface water were detected in the northeast area of the investigation area in spring and winter. Significant correlations were found between COD and salinity, temperature, pH, dissolved oxygen (DO) and phosphate, while petroleum hydrocarbon concentration in surface water showed a significant correlation with salinity, temperature, pH, inorganic nitrogen and COD. Multiple regression analyses suggest that COD may be mainly controlled by pH and DO, while for petroleum hydrocarbon concentration temperature play a more important role