三沙湾海域化学需氧量(COD)分布特征及相关性分析
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摘要
2012年5月和11月对三沙湾海域水质化学需氧量(COD)进行大面积调查研究,结果表明,2012年三沙湾海域COD含量变化范围为0.52~2.13 mg/L,平均含量为0.94 mg/L;水平分布特征呈西北侧向东南水域逐渐递减的趋势,白马港海域COD含量最高;秋季高于春季;平均COD含量能达到一类海水水质标准要求;化学需氧量与活性硅酸盐、无机氮、总氮及悬浮物呈极显著正相关;与p H值、盐度呈极显著负相关。
The investigation of water quality in Sansha Bay was carried out in May and November of 2012,the result showed that the content of COD in the water ranged from 0. 52 to 2. 13 mg / L,with an average of0. 94 mg / L. The spatial distribution feature showed that COD was gradually decreased from northwest to southeast,and highest in Baima Bay. COD content in autumn was higher than that of in spring. The average content of COD could meet the first class of sea water quality standard( COD < 2mg / L). Correlation analysis of COD and environmental variables were performed. Active silicate,inorganic nitrogen,total nitrogen and suspended substance were positively correlated with COD. Salinity and p H had a negative significant correlation with COD.
The investigation of water quality in Sansha Bay was carried out in May and November of 2012,the result showed that the content of COD in the water ranged from 0. 52 to 2. 13 mg / L,with an average of0. 94 mg / L. The spatial distribution feature showed that COD was gradually decreased from northwest to southeast,and highest in Baima Bay. COD content in autumn was higher than that of in spring. The average content of COD could meet the first class of sea water quality standard( COD < 2mg / L). Correlation analysis of COD and environmental variables were performed. Active silicate,inorganic nitrogen,total nitrogen and suspended substance were positively correlated with COD. Salinity and p H had a negative significant correlation with COD.
引文
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