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2002年5月和8 月对珠江口伶仃洋水域水质化学耗氧量(COD)进行了调查研究,结果表明:该水域近期 COD 含量变幅在 0.41 ～ 2.72 mg·L-1 之间,平均值为 1.21 mg·L-1;区域分布呈北部向南部水域逐渐递减以及近岸水域含量大于远岸的变化趋势;夏季 COD 的含量高于春季;以我国Ⅰ类海水水质 COD 含量≤2 mg·L-1 标准评价,超标率为 15 %;COD 含量与同期(春、夏季)的悬浮物含量呈正相关性,与无机氮和活性磷酸盐含量在夏季呈负相关性。
The chemical oxygen demand (COD) in the waters of Lingdingyang Sea in the Pearl River Estuary was investigated in May and August 2002. The results showed that the COD content in the waters ranged from 0.41 to 2.72 mg · L-1, Which was 1.21 mg · L-1. The regional distribution showed a gradual decreasing trend from north to south and the variation of near-shore water content was greater than that of far coast. The content of COD in summer was higher than that in spring. -1 standard, exceeding the standard rate of 15%; COD content and the same period (spring and summer) suspended solids content was positively correlated with inorganic nitrogen and active phosphate content in the summer was negatively correlated.