无机阴离子及溶解性有机质对程海化学需氧量测定值的影响

发布时间：2018-07-03 14:05

本文选题：化学需氧量 + 氯离子　；参考：《湖泊科学》2017年06期

【摘要】：自2005年以来,程海水体的化学需氧量(COD)持续升高,而生化需氧量(BOD)却维持不变,高锰酸盐指数(COD_(Mn))升高也较缓慢.为研究程海COD持续升高的原因,选取程海水体中具有代表性的无机阴离子(Cl~-、F~-、S~(2-)、HCO_3~-)和溶解性有机质(DOM)中不同浓度的胡敏酸(HA)、富里酸(FA)和商品化腐殖酸(SHA),研究其对COD和COD_(Mn)测定的影响,探讨Cl~-和DOM共同存在下对COD测定的影响.结果表明:程海水体中Cl~-浓度对COD存在显著影响,产生的COD值为5.42 mg/L,S~(2-)、F~-和HCO_3~-对COD影响较小;各离子对COD_(Mn)的影响很小;不同浓度梯度的HA、FA和SHA与COD测定结果呈显著线性相关,氧化1 mg C HA、FA和SHA所产生的COD值分别为2.164、1.964和2.362 mg;氧化1 mg C HA和FA所产生的COD_(Mn)值分别为0.646和0.344 mg;DOM对COD测定值的影响显著大于对COD_(Mn)测定值的影响;且一定浓度Cl~-的存在增强了FA与HA对COD测定的影响.该研究为进一步阐明程海COD逐步升高,COD_(Mn)值缓慢升高的内在原因奠定了基础.
[Abstract]:Since 2005, the chemical oxygen demand (COD) of Chenghai water continues to increase, while the biochemical oxygen demand (bod) remains unchanged, and the permanganate index (COD _ (mn) increases slowly. In order to study the reason for the continuous increase of COD in Chenghai, the influence of inorganic anions (Cl-FF- ~ (2-) HCO3-) and dissolved organic matter (Dom) in different concentrations of Hu Min acid (HA), fulvic acid (FA) and commercial humic acid (SHA) on the determination of COD and COD- (mn) were studied. The effect of CL- and Dom on COD determination was discussed. The results showed that the concentration of Cln- in the water of Chenghai had a significant effect on COD, and the COD values were 5.42 mg / L ~ (2-) and HCOS ~ (2 -) ~ (2 -), the effect of ions on COD _ (mn) was very small, and the results of HAFA and SHA of different concentration gradients showed a significant linear correlation with COD. The COD values produced by oxidation of 1 mg C HAFA and SHA were 2.164 and 2.362 mg, respectively, and the COD _ (mn) produced by oxidation of 1 mg C, HA and FA were 0.646 and 0.344 mg / kg respectively, which were significantly greater than those of COD _ (mn). The influence of FA and HA on the determination of COD was enhanced by the presence of Cln- at a certain concentration. This study lays a foundation for further elucidation of the internal causes of the gradual increase of COD in Chenghai and the slow increase of COD _ (mn) value.
【作者单位】：昆明理工大学环境科学与工程学院;
【基金】：云南环境保护专项资助
【分类号】：X832

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